System Versioning 1.0 pre7

Merge branch '10.3' into trunk

9 files changed, 0 insertions, 2970 deletions

diff --git a/plugin/semisync/CMakeLists.txt b/plugin/semisync/CMakeLists.txt
deleted file mode 100644
index 88998fb3093..00000000000
--- a/plugin/semisync/CMakeLists.txt
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
-# 
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; version 2 of the License.
-# 
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-# 
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
-
-SET(SEMISYNC_MASTER_SOURCES  
- semisync.cc semisync_master.cc semisync_master_plugin.cc
- semisync.h semisync_master.h)
-
-MYSQL_ADD_PLUGIN(semisync_master ${SEMISYNC_MASTER_SOURCES}
-  RECOMPILE_FOR_EMBEDDED)
-
-SET(SEMISYNC_SLAVE_SOURCES  semisync.cc semisync_slave.cc 
-  semisync_slave_plugin.cc semisync.h semisync_slave.h )
-
-MYSQL_ADD_PLUGIN(semisync_slave ${SEMISYNC_SLAVE_SOURCES}
-  RECOMPILE_FOR_EMBEDDED)
-
diff --git a/plugin/semisync/semisync.cc b/plugin/semisync/semisync.cc
deleted file mode 100644
index df37f03ec2f..00000000000
--- a/plugin/semisync/semisync.cc
+++ /dev/null
@@ -1,32 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (C) 2008 MySQL AB
-   Use is subject to license terms
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#include <my_global.h>
-#include "semisync.h"
-
-const unsigned char ReplSemiSyncBase::kPacketMagicNum = 0xef;
-const unsigned char ReplSemiSyncBase::kPacketFlagSync = 0x01;
-
-
-const unsigned long Trace::kTraceGeneral  = 0x0001;
-const unsigned long Trace::kTraceDetail   = 0x0010;
-const unsigned long Trace::kTraceNetWait  = 0x0020;
-const unsigned long Trace::kTraceFunction = 0x0040;
-
-const unsigned char  ReplSemiSyncBase::kSyncHeader[2] =
-  {ReplSemiSyncBase::kPacketMagicNum, 0};
diff --git a/plugin/semisync/semisync.h b/plugin/semisync/semisync.h
deleted file mode 100644
index 28577296817..00000000000
--- a/plugin/semisync/semisync.h
+++ /dev/null
@@ -1,93 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (C) 2008 MySQL AB
-   Use is subject to license terms
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#ifndef SEMISYNC_H
-#define SEMISYNC_H
-
-#define MYSQL_SERVER
-#define HAVE_REPLICATION
-#include <my_pthread.h>
-#include <sql_priv.h>
-#include <sql_class.h>
-#include "unireg.h"
-#include <replication.h>
-#include "log.h"                                /* sql_print_information */
-
-typedef struct st_mysql_show_var SHOW_VAR;
-typedef struct st_mysql_sys_var SYS_VAR;
-
-
-/**
-   This class is used to trace function calls and other process
-   information
-*/
-class Trace {
-public:
-  static const unsigned long kTraceFunction;
-  static const unsigned long kTraceGeneral;
-  static const unsigned long kTraceDetail;
-  static const unsigned long kTraceNetWait;
-
-  unsigned long           trace_level_;                      /* the level for tracing */
-
-  inline void function_enter(const char *func_name)
-  {
-    if (trace_level_ & kTraceFunction)
-      sql_print_information("---> %s enter", func_name);
-  }
-  inline int  function_exit(const char *func_name, int exit_code)
-  {
-    if (trace_level_ & kTraceFunction)
-      sql_print_information("<--- %s exit (%d)", func_name, exit_code);
-    return exit_code;
-  }
-
-  Trace()
-    :trace_level_(0L)
-  {}
-  Trace(unsigned long trace_level)
-    :trace_level_(trace_level)
-  {}
-};
-
-/**
-   Base class for semi-sync master and slave classes
-*/
-class ReplSemiSyncBase
-  :public Trace {
-public:
-  static const unsigned char  kSyncHeader[2];     /* three byte packet header */
-
-  /* Constants in network packet header. */
-  static const unsigned char kPacketMagicNum;
-  static const unsigned char kPacketFlagSync;
-};
-
-/* The layout of a semisync slave reply packet:
-   1 byte for the magic num
-   8 bytes for the binlog positon
-   n bytes for the binlog filename, terminated with a '\0'
-*/
-#define REPLY_MAGIC_NUM_LEN 1
-#define REPLY_BINLOG_POS_LEN 8
-#define REPLY_BINLOG_NAME_LEN (FN_REFLEN + 1)
-#define REPLY_MAGIC_NUM_OFFSET 0
-#define REPLY_BINLOG_POS_OFFSET (REPLY_MAGIC_NUM_OFFSET + REPLY_MAGIC_NUM_LEN)
-#define REPLY_BINLOG_NAME_OFFSET (REPLY_BINLOG_POS_OFFSET + REPLY_BINLOG_POS_LEN)
-
-#endif /* SEMISYNC_H */
diff --git a/plugin/semisync/semisync_master.cc b/plugin/semisync/semisync_master.cc
deleted file mode 100644
index 975b2e13253..00000000000
--- a/plugin/semisync/semisync_master.cc
+++ /dev/null
@@ -1,1218 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (c) 2008, 2013, Oracle and/or its affiliates.
-   Copyright (c) 2011, 2016, MariaDB
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#include <my_global.h>
-#include "semisync_master.h"
-
-#define TIME_THOUSAND 1000
-#define TIME_MILLION  1000000
-#define TIME_BILLION  1000000000
-
-/* This indicates whether semi-synchronous replication is enabled. */
-char rpl_semi_sync_master_enabled;
-unsigned long rpl_semi_sync_master_wait_point       =
-    SEMI_SYNC_MASTER_WAIT_POINT_AFTER_STORAGE_COMMIT;
-unsigned long rpl_semi_sync_master_timeout;
-unsigned long rpl_semi_sync_master_trace_level;
-char rpl_semi_sync_master_status                    = 0;
-unsigned long rpl_semi_sync_master_yes_transactions = 0;
-unsigned long rpl_semi_sync_master_no_transactions  = 0;
-unsigned long rpl_semi_sync_master_off_times        = 0;
-unsigned long rpl_semi_sync_master_timefunc_fails   = 0;
-unsigned long rpl_semi_sync_master_wait_timeouts     = 0;
-unsigned long rpl_semi_sync_master_wait_sessions    = 0;
-unsigned long rpl_semi_sync_master_wait_pos_backtraverse = 0;
-unsigned long rpl_semi_sync_master_avg_trx_wait_time = 0;
-unsigned long long rpl_semi_sync_master_trx_wait_num = 0;
-unsigned long rpl_semi_sync_master_avg_net_wait_time    = 0;
-unsigned long long rpl_semi_sync_master_net_wait_num = 0;
-unsigned long rpl_semi_sync_master_clients          = 0;
-unsigned long long rpl_semi_sync_master_net_wait_time = 0;
-unsigned long long rpl_semi_sync_master_trx_wait_time = 0;
-char rpl_semi_sync_master_wait_no_slave = 1;
-
-
-static int getWaitTime(const struct timespec& start_ts);
-
-static unsigned long long timespec_to_usec(const struct timespec *ts)
-{
-  return (unsigned long long) ts->tv_sec * TIME_MILLION + ts->tv_nsec / TIME_THOUSAND;
-}
-
-/*******************************************************************************
- *
- * <ActiveTranx> class : manage all active transaction nodes
- *
- ******************************************************************************/
-
-ActiveTranx::ActiveTranx(mysql_mutex_t *lock,
-			 unsigned long trace_level)
-  : Trace(trace_level), allocator_(max_connections),
-    num_entries_(max_connections << 1), /* Transaction hash table size
-                                         * is set to double the size
-                                         * of max_connections */
-    lock_(lock)
-{
-  /* No transactions are in the list initially. */
-  trx_front_ = NULL;
-  trx_rear_  = NULL;
-
-  /* Create the hash table to find a transaction's ending event. */
-  trx_htb_ = new TranxNode *[num_entries_];
-  for (int idx = 0; idx < num_entries_; ++idx)
-    trx_htb_[idx] = NULL;
-
-  sql_print_information("Semi-sync replication initialized for transactions.");
-}
-
-ActiveTranx::~ActiveTranx()
-{
-  delete [] trx_htb_;
-  trx_htb_          = NULL;
-  num_entries_      = 0;
-}
-
-unsigned int ActiveTranx::calc_hash(const unsigned char *key,
-                                    unsigned int length)
-{
-  unsigned int nr = 1, nr2 = 4;
-
-  /* The hash implementation comes from calc_hashnr() in mysys/hash.c. */
-  while (length--)
-  {
-    nr  ^= (((nr & 63)+nr2)*((unsigned int) (unsigned char) *key++))+ (nr << 8);
-    nr2 += 3;
-  }
-  return((unsigned int) nr);
-}
-
-unsigned int ActiveTranx::get_hash_value(const char *log_file_name,
-				 my_off_t    log_file_pos)
-{
-  unsigned int hash1 = calc_hash((const unsigned char *)log_file_name,
-                                 strlen(log_file_name));
-  unsigned int hash2 = calc_hash((const unsigned char *)(&log_file_pos),
-                                 sizeof(log_file_pos));
-
-  return (hash1 + hash2) % num_entries_;
-}
-
-int ActiveTranx::compare(const char *log_file_name1, my_off_t log_file_pos1,
-			 const char *log_file_name2, my_off_t log_file_pos2)
-{
-  int cmp = strcmp(log_file_name1, log_file_name2);
-
-  if (cmp != 0)
-    return cmp;
-
-  if (log_file_pos1 > log_file_pos2)
-    return 1;
-  else if (log_file_pos1 < log_file_pos2)
-    return -1;
-  return 0;
-}
-
-int ActiveTranx::insert_tranx_node(const char *log_file_name,
-				   my_off_t log_file_pos)
-{
-  const char *kWho = "ActiveTranx:insert_tranx_node";
-  TranxNode  *ins_node;
-  int         result = 0;
-  unsigned int        hash_val;
-
-  function_enter(kWho);
-
-  ins_node = allocator_.allocate_node();
-  if (!ins_node)
-  {
-    sql_print_error("%s: transaction node allocation failed for: (%s, %lu)",
-                    kWho, log_file_name, (unsigned long)log_file_pos);
-    result = -1;
-    goto l_end;
-  }
-
-  /* insert the binlog position in the active transaction list. */
-  strncpy(ins_node->log_name_, log_file_name, FN_REFLEN-1);
-  ins_node->log_name_[FN_REFLEN-1] = 0; /* make sure it ends properly */
-  ins_node->log_pos_ = log_file_pos;
-
-  if (!trx_front_)
-  {
-    /* The list is empty. */
-    trx_front_ = trx_rear_ = ins_node;
-  }
-  else
-  {
-    int cmp = compare(ins_node, trx_rear_);
-    if (cmp > 0)
-    {
-      /* Compare with the tail first.  If the transaction happens later in
-       * binlog, then make it the new tail.
-       */
-      trx_rear_->next_ = ins_node;
-      trx_rear_        = ins_node;
-    }
-    else
-    {
-      /* Otherwise, it is an error because the transaction should hold the
-       * mysql_bin_log.LOCK_log when appending events.
-       */
-      sql_print_error("%s: binlog write out-of-order, tail (%s, %lu), "
-                      "new node (%s, %lu)", kWho,
-                      trx_rear_->log_name_, (unsigned long)trx_rear_->log_pos_,
-                      ins_node->log_name_, (unsigned long)ins_node->log_pos_);
-      result = -1;
-      goto l_end;
-    }
-  }
-
-  hash_val = get_hash_value(ins_node->log_name_, ins_node->log_pos_);
-  ins_node->hash_next_ = trx_htb_[hash_val];
-  trx_htb_[hash_val]   = ins_node;
-
-  if (trace_level_ & kTraceDetail)
-    sql_print_information("%s: insert (%s, %lu) in entry(%u)", kWho,
-                          ins_node->log_name_, (unsigned long)ins_node->log_pos_,
-                          hash_val);
-
- l_end:
-  return function_exit(kWho, result);
-}
-
-bool ActiveTranx::is_tranx_end_pos(const char *log_file_name,
-				   my_off_t    log_file_pos)
-{
-  const char *kWho = "ActiveTranx::is_tranx_end_pos";
-  function_enter(kWho);
-
-  unsigned int hash_val = get_hash_value(log_file_name, log_file_pos);
-  TranxNode *entry = trx_htb_[hash_val];
-
-  while (entry != NULL)
-  {
-    if (compare(entry, log_file_name, log_file_pos) == 0)
-      break;
-
-    entry = entry->hash_next_;
-  }
-
-  if (trace_level_ & kTraceDetail)
-    sql_print_information("%s: probe (%s, %lu) in entry(%u)", kWho,
-                          log_file_name, (unsigned long)log_file_pos, hash_val);
-
-  function_exit(kWho, (entry != NULL));
-  return (entry != NULL);
-}
-
-int ActiveTranx::clear_active_tranx_nodes(const char *log_file_name,
-					  my_off_t log_file_pos)
-{
-  const char *kWho = "ActiveTranx::::clear_active_tranx_nodes";
-  TranxNode *new_front;
-
-  function_enter(kWho);
-
-  if (log_file_name != NULL)
-  {
-    new_front = trx_front_;
-
-    while (new_front)
-    {
-      if (compare(new_front, log_file_name, log_file_pos) > 0)
-        break;
-      new_front = new_front->next_;
-    }
-  }
-  else
-  {
-    /* If log_file_name is NULL, clear everything. */
-    new_front = NULL;
-  }
-
-  if (new_front == NULL)
-  {
-    /* No active transaction nodes after the call. */
-
-    /* Clear the hash table. */
-    memset(trx_htb_, 0, num_entries_ * sizeof(TranxNode *));
-    allocator_.free_all_nodes();
-
-    /* Clear the active transaction list. */
-    if (trx_front_ != NULL)
-    {
-      trx_front_ = NULL;
-      trx_rear_  = NULL;
-    }
-
-    if (trace_level_ & kTraceDetail)
-      sql_print_information("%s: cleared all nodes", kWho);
-  }
-  else if (new_front != trx_front_)
-  {
-    TranxNode *curr_node, *next_node;
-
-    /* Delete all transaction nodes before the confirmation point. */
-    int n_frees = 0;
-    curr_node = trx_front_;
-    while (curr_node != new_front)
-    {
-      next_node = curr_node->next_;
-      n_frees++;
-
-      /* Remove the node from the hash table. */
-      unsigned int hash_val = get_hash_value(curr_node->log_name_, curr_node->log_pos_);
-      TranxNode **hash_ptr = &(trx_htb_[hash_val]);
-      while ((*hash_ptr) != NULL)
-      {
-        if ((*hash_ptr) == curr_node)
-	{
-          (*hash_ptr) = curr_node->hash_next_;
-          break;
-        }
-        hash_ptr = &((*hash_ptr)->hash_next_);
-      }
-
-      curr_node = next_node;
-    }
-
-    trx_front_ = new_front;
-    allocator_.free_nodes_before(trx_front_);
-
-    if (trace_level_ & kTraceDetail)
-      sql_print_information("%s: cleared %d nodes back until pos (%s, %lu)",
-                            kWho, n_frees,
-                            trx_front_->log_name_, (unsigned long)trx_front_->log_pos_);
-  }
-
-  return function_exit(kWho, 0);
-}
-
-
-/*******************************************************************************
- *
- * <ReplSemiSyncMaster> class: the basic code layer for sync-replication master.
- * <ReplSemiSyncSlave>  class: the basic code layer for sync-replication slave.
- *
- * The most important functions during semi-syn replication listed:
- *
- * Master:
- *  . reportReplyBinlog():  called by the binlog dump thread when it receives
- *                          the slave's status information.
- *  . updateSyncHeader():   based on transaction waiting information, decide
- *                          whether to request the slave to reply.
- *  . writeTranxInBinlog(): called by the transaction thread when it finishes
- *                          writing all transaction events in binlog.
- *  . commitTrx():          transaction thread wait for the slave reply.
- *
- * Slave:
- *  . slaveReadSyncHeader(): read the semi-sync header from the master, get the
- *                           sync status and get the payload for events.
- *  . slaveReply():          reply to the master about the replication progress.
- *
- ******************************************************************************/
-
-ReplSemiSyncMaster::ReplSemiSyncMaster()
-  : active_tranxs_(NULL),
-    init_done_(false),
-    reply_file_name_inited_(false),
-    reply_file_pos_(0L),
-    wait_file_name_inited_(false),
-    wait_file_pos_(0),
-    master_enabled_(false),
-    wait_timeout_(0L),
-    state_(0)
-{
-  strcpy(reply_file_name_, "");
-  strcpy(wait_file_name_, "");
-}
-
-int ReplSemiSyncMaster::initObject()
-{
-  int result;
-  const char *kWho = "ReplSemiSyncMaster::initObject";
-
-  if (init_done_)
-  {
-    fprintf(stderr, "%s called twice\n", kWho);
-    return 1;
-  }
-  init_done_ = true;
-
-  /* References to the parameter works after set_options(). */
-  setWaitTimeout(rpl_semi_sync_master_timeout);
-  setTraceLevel(rpl_semi_sync_master_trace_level);
-
-  /* Mutex initialization can only be done after MY_INIT(). */
-  mysql_mutex_init(key_ss_mutex_LOCK_binlog_,
-                   &LOCK_binlog_, MY_MUTEX_INIT_FAST);
-  mysql_cond_init(key_ss_cond_COND_binlog_send_,
-                  &COND_binlog_send_, NULL);
-
-  if (rpl_semi_sync_master_enabled)
-    result = enableMaster();
-  else
-    result = disableMaster();
-
-  return result;
-}
-
-int ReplSemiSyncMaster::enableMaster()
-{
-  int result = 0;
-
-  /* Must have the lock when we do enable of disable. */
-  lock();
-
-  if (!getMasterEnabled())
-  {
-    active_tranxs_ = new ActiveTranx(&LOCK_binlog_, trace_level_);
-    if (active_tranxs_ != NULL)
-    {
-      commit_file_name_inited_ = false;
-      reply_file_name_inited_  = false;
-      wait_file_name_inited_   = false;
-
-      set_master_enabled(true);
-      state_ = true;
-      sql_print_information("Semi-sync replication enabled on the master.");
-    }
-    else
-    {
-      sql_print_error("Cannot allocate memory to enable semi-sync on the master.");
-      result = -1;
-    }
-  }
-
-  unlock();
-
-  return result;
-}
-
-int ReplSemiSyncMaster::disableMaster()
-{
-  /* Must have the lock when we do enable of disable. */
-  lock();
-
-  if (getMasterEnabled())
-  {
-    /* Switch off the semi-sync first so that waiting transaction will be
-     * waken up.
-     */
-    switch_off();
-
-    assert(active_tranxs_ != NULL);
-    delete active_tranxs_;
-    active_tranxs_ = NULL;
-
-    reply_file_name_inited_ = false;
-    wait_file_name_inited_  = false;
-    commit_file_name_inited_ = false;
-
-    set_master_enabled(false);
-    sql_print_information("Semi-sync replication disabled on the master.");
-  }
-
-  unlock();
-
-  return 0;
-}
-
-void ReplSemiSyncMaster::cleanup()
-{
-  if (init_done_)
-  {
-    mysql_mutex_destroy(&LOCK_binlog_);
-    mysql_cond_destroy(&COND_binlog_send_);
-    init_done_= 0;
-  }
-
-  delete active_tranxs_;
-}
-
-void ReplSemiSyncMaster::lock()
-{
-  mysql_mutex_lock(&LOCK_binlog_);
-}
-
-void ReplSemiSyncMaster::unlock()
-{
-  mysql_mutex_unlock(&LOCK_binlog_);
-}
-
-void ReplSemiSyncMaster::cond_broadcast()
-{
-  mysql_cond_broadcast(&COND_binlog_send_);
-}
-
-int ReplSemiSyncMaster::cond_timewait(struct timespec *wait_time)
-{
-  const char *kWho = "ReplSemiSyncMaster::cond_timewait()";
-  int wait_res;
-
-  function_enter(kWho);
-  wait_res= mysql_cond_timedwait(&COND_binlog_send_,
-                                 &LOCK_binlog_, wait_time);
-  return function_exit(kWho, wait_res);
-}
-
-void ReplSemiSyncMaster::add_slave()
-{
-  lock();
-  rpl_semi_sync_master_clients++;
-  unlock();
-}
-
-void ReplSemiSyncMaster::remove_slave()
-{
-  lock();
-  rpl_semi_sync_master_clients--;
-
-  /* Only switch off if semi-sync is enabled and is on */
-  if (getMasterEnabled() && is_on())
-  {
-    /* If user has chosen not to wait if no semi-sync slave available
-       and the last semi-sync slave exits, turn off semi-sync on master
-       immediately.
-     */
-    if (!rpl_semi_sync_master_wait_no_slave &&
-        rpl_semi_sync_master_clients == 0)
-      switch_off();
-  }
-  unlock();
-}
-
-bool ReplSemiSyncMaster::is_semi_sync_slave()
-{
-  int null_value;
-  long long val= 0;
-  get_user_var_int("rpl_semi_sync_slave", &val, &null_value);
-  return val;
-}
-
-int ReplSemiSyncMaster::reportReplyBinlog(uint32 server_id,
-					  const char *log_file_name,
-					  my_off_t log_file_pos)
-{
-  const char *kWho = "ReplSemiSyncMaster::reportReplyBinlog";
-  int   cmp;
-  bool  can_release_threads = false;
-  bool  need_copy_send_pos = true;
-
-  if (!(getMasterEnabled()))
-    return 0;
-
-  function_enter(kWho);
-
-  lock();
-
-  /* This is the real check inside the mutex. */
-  if (!getMasterEnabled())
-    goto l_end;
-
-  if (!is_on())
-    /* We check to see whether we can switch semi-sync ON. */
-    try_switch_on(server_id, log_file_name, log_file_pos);
-
-  /* The position should increase monotonically, if there is only one
-   * thread sending the binlog to the slave.
-   * In reality, to improve the transaction availability, we allow multiple
-   * sync replication slaves.  So, if any one of them get the transaction,
-   * the transaction session in the primary can move forward.
-   */
-  if (reply_file_name_inited_)
-  {
-    cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                               reply_file_name_, reply_file_pos_);
-
-    /* If the requested position is behind the sending binlog position,
-     * would not adjust sending binlog position.
-     * We based on the assumption that there are multiple semi-sync slave,
-     * and at least one of them shou/ld be up to date.
-     * If all semi-sync slaves are behind, at least initially, the primary
-     * can find the situation after the waiting timeout.  After that, some
-     * slaves should catch up quickly.
-     */
-    if (cmp < 0)
-    {
-      /* If the position is behind, do not copy it. */
-      need_copy_send_pos = false;
-    }
-  }
-
-  if (need_copy_send_pos)
-  {
-    strmake_buf(reply_file_name_, log_file_name);
-    reply_file_pos_ = log_file_pos;
-    reply_file_name_inited_ = true;
-
-    /* Remove all active transaction nodes before this point. */
-    assert(active_tranxs_ != NULL);
-    active_tranxs_->clear_active_tranx_nodes(log_file_name, log_file_pos);
-
-    if (trace_level_ & kTraceDetail)
-      sql_print_information("%s: Got reply at (%s, %lu)", kWho,
-                            log_file_name, (unsigned long)log_file_pos);
-  }
-
-  if (rpl_semi_sync_master_wait_sessions > 0)
-  {
-    /* Let us check if some of the waiting threads doing a trx
-     * commit can now proceed.
-     */
-    cmp = ActiveTranx::compare(reply_file_name_, reply_file_pos_,
-                               wait_file_name_, wait_file_pos_);
-    if (cmp >= 0)
-    {
-      /* Yes, at least one waiting thread can now proceed:
-       * let us release all waiting threads with a broadcast
-       */
-      can_release_threads = true;
-      wait_file_name_inited_ = false;
-    }
-  }
-
- l_end:
-  unlock();
-
-  if (can_release_threads)
-  {
-    if (trace_level_ & kTraceDetail)
-      sql_print_information("%s: signal all waiting threads.", kWho);
-
-    cond_broadcast();
-  }
-
-  return function_exit(kWho, 0);
-}
-
-int ReplSemiSyncMaster::commitTrx(const char* trx_wait_binlog_name,
-				  my_off_t trx_wait_binlog_pos)
-{
-  const char *kWho = "ReplSemiSyncMaster::commitTrx";
-
-  function_enter(kWho);
-
-  if (getMasterEnabled() && trx_wait_binlog_name)
-  {
-    struct timespec start_ts;
-    struct timespec abstime;
-    int wait_result;
-    PSI_stage_info old_stage;
-
-    set_timespec(start_ts, 0);
-
-    DEBUG_SYNC(current_thd, "rpl_semisync_master_commit_trx_before_lock");
-    /* Acquire the mutex. */
-    lock();
-
-    /* This must be called after acquired the lock */
-    THD_ENTER_COND(NULL, &COND_binlog_send_, &LOCK_binlog_,
-                   & stage_waiting_for_semi_sync_ack_from_slave,
-                   & old_stage);
-
-    /* This is the real check inside the mutex. */
-    if (!getMasterEnabled() || !is_on())
-      goto l_end;
-
-    if (trace_level_ & kTraceDetail)
-    {
-      sql_print_information("%s: wait pos (%s, %lu), repl(%d)\n", kWho,
-                            trx_wait_binlog_name, (unsigned long)trx_wait_binlog_pos,
-                            (int)is_on());
-    }
-
-    while (is_on() && !thd_killed(current_thd))
-    {
-      if (reply_file_name_inited_)
-      {
-        int cmp = ActiveTranx::compare(reply_file_name_, reply_file_pos_,
-                                       trx_wait_binlog_name, trx_wait_binlog_pos);
-        if (cmp >= 0)
-        {
-          /* We have already sent the relevant binlog to the slave: no need to
-           * wait here.
-           */
-          if (trace_level_ & kTraceDetail)
-            sql_print_information("%s: Binlog reply is ahead (%s, %lu),",
-                                  kWho, reply_file_name_, (unsigned long)reply_file_pos_);
-          break;
-        }
-      }
-
-      /* Let us update the info about the minimum binlog position of waiting
-       * threads.
-       */
-      if (wait_file_name_inited_)
-      {
-        int cmp = ActiveTranx::compare(trx_wait_binlog_name, trx_wait_binlog_pos,
-                                       wait_file_name_, wait_file_pos_);
-        if (cmp <= 0)
-	{
-          /* This thd has a lower position, let's update the minimum info. */
-          strmake_buf(wait_file_name_, trx_wait_binlog_name);
-          wait_file_pos_ = trx_wait_binlog_pos;
-
-          rpl_semi_sync_master_wait_pos_backtraverse++;
-          if (trace_level_ & kTraceDetail)
-            sql_print_information("%s: move back wait position (%s, %lu),",
-                                  kWho, wait_file_name_, (unsigned long)wait_file_pos_);
-        }
-      }
-      else
-      {
-        strmake_buf(wait_file_name_, trx_wait_binlog_name);
-        wait_file_pos_ = trx_wait_binlog_pos;
-        wait_file_name_inited_ = true;
-
-        if (trace_level_ & kTraceDetail)
-          sql_print_information("%s: init wait position (%s, %lu),",
-                                kWho, wait_file_name_, (unsigned long)wait_file_pos_);
-      }
-
-      /* Calcuate the waiting period. */
-      long diff_secs = (long) (wait_timeout_ / TIME_THOUSAND); 
-      long diff_nsecs = (long) ((wait_timeout_ % TIME_THOUSAND) * TIME_MILLION);
-      long nsecs = start_ts.tv_nsec + diff_nsecs;
-      abstime.tv_sec = start_ts.tv_sec + diff_secs + nsecs/TIME_BILLION;
-      abstime.tv_nsec = nsecs % TIME_BILLION;
-      
-      /* In semi-synchronous replication, we wait until the binlog-dump
-       * thread has received the reply on the relevant binlog segment from the
-       * replication slave.
-       *
-       * Let us suspend this thread to wait on the condition;
-       * when replication has progressed far enough, we will release
-       * these waiting threads.
-       */
-      rpl_semi_sync_master_wait_sessions++;
-      
-      if (trace_level_ & kTraceDetail)
-        sql_print_information("%s: wait %lu ms for binlog sent (%s, %lu)",
-                              kWho, wait_timeout_,
-                              wait_file_name_, (unsigned long)wait_file_pos_);
-      
-      wait_result = cond_timewait(&abstime);
-      rpl_semi_sync_master_wait_sessions--;
-      
-      if (wait_result != 0)
-      {
-        /* This is a real wait timeout. */
-        sql_print_warning("Timeout waiting for reply of binlog (file: %s, pos: %lu), "
-                          "semi-sync up to file %s, position %lu.",
-                          trx_wait_binlog_name, (unsigned long)trx_wait_binlog_pos,
-                          reply_file_name_, (unsigned long)reply_file_pos_);
-        rpl_semi_sync_master_wait_timeouts++;
-        
-        /* switch semi-sync off */
-        switch_off();
-      }
-      else
-      {
-        int wait_time;
-        
-        wait_time = getWaitTime(start_ts);
-        if (wait_time < 0)
-        {
-          if (trace_level_ & kTraceGeneral)
-          {
-            sql_print_error("Replication semi-sync getWaitTime fail at "
-                            "wait position (%s, %lu)",
-                            trx_wait_binlog_name, (unsigned long)trx_wait_binlog_pos);
-          }
-          rpl_semi_sync_master_timefunc_fails++;
-        }
-        else
-        {
-          rpl_semi_sync_master_trx_wait_num++;
-          rpl_semi_sync_master_trx_wait_time += wait_time;
-        }
-      }
-    }
-
-    /*
-      At this point, the binlog file and position of this transaction
-      must have been removed from ActiveTranx.
-      active_tranxs_ may be NULL if someone disabled semi sync during
-      cond_timewait()
-    */
-    assert(thd_killed(current_thd) || !active_tranxs_ ||
-           !active_tranxs_->is_tranx_end_pos(trx_wait_binlog_name,
-                                             trx_wait_binlog_pos));
-    
-  l_end:
-    /* Update the status counter. */
-    if (is_on())
-      rpl_semi_sync_master_yes_transactions++;
-    else
-      rpl_semi_sync_master_no_transactions++;
-
-    /* The lock held will be released by thd_exit_cond, so no need to
-       call unlock() here */
-    THD_EXIT_COND(NULL, & old_stage);
-  }
-
-  return function_exit(kWho, 0);
-}
-
-/* Indicate that semi-sync replication is OFF now.
- * 
- * What should we do when it is disabled?  The problem is that we want
- * the semi-sync replication enabled again when the slave catches up
- * later.  But, it is not that easy to detect that the slave has caught
- * up.  This is caused by the fact that MySQL's replication protocol is
- * asynchronous, meaning that if the master does not use the semi-sync
- * protocol, the slave would not send anything to the master.
- * Still, if the master is sending (N+1)-th event, we assume that it is
- * an indicator that the slave has received N-th event and earlier ones.
- *
- * If semi-sync is disabled, all transactions still update the wait
- * position with the last position in binlog.  But no transactions will
- * wait for confirmations and the active transaction list would not be
- * maintained.  In binlog dump thread, updateSyncHeader() checks whether
- * the current sending event catches up with last wait position.  If it
- * does match, semi-sync will be switched on again.
- */
-int ReplSemiSyncMaster::switch_off()
-{
-  const char *kWho = "ReplSemiSyncMaster::switch_off";
-  int result;
-
-  function_enter(kWho);
-  state_ = false;
-
-  /* Clear the active transaction list. */
-  assert(active_tranxs_ != NULL);
-  result = active_tranxs_->clear_active_tranx_nodes(NULL, 0);
-
-  rpl_semi_sync_master_off_times++;
-  wait_file_name_inited_   = false;
-  reply_file_name_inited_  = false;
-  sql_print_information("Semi-sync replication switched OFF.");
-  cond_broadcast();                            /* wake up all waiting threads */
-
-  return function_exit(kWho, result);
-}
-
-int ReplSemiSyncMaster::try_switch_on(int server_id,
-				      const char *log_file_name,
-				      my_off_t log_file_pos)
-{
-  const char *kWho = "ReplSemiSyncMaster::try_switch_on";
-  bool semi_sync_on = false;
-
-  function_enter(kWho);
-
-  /* If the current sending event's position is larger than or equal to the
-   * 'largest' commit transaction binlog position, the slave is already
-   * catching up now and we can switch semi-sync on here.
-   * If commit_file_name_inited_ indicates there are no recent transactions,
-   * we can enable semi-sync immediately.
-   */
-  if (commit_file_name_inited_)
-  {
-    int cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                                   commit_file_name_, commit_file_pos_);
-    semi_sync_on = (cmp >= 0);
-  }
-  else
-  {
-    semi_sync_on = true;
-  }
-
-  if (semi_sync_on)
-  {
-    /* Switch semi-sync replication on. */
-    state_ = true;
-
-    sql_print_information("Semi-sync replication switched ON with slave (server_id: %d) "
-                          "at (%s, %lu)",
-                          server_id, log_file_name,
-                          (unsigned long)log_file_pos);
-  }
-
-  return function_exit(kWho, 0);
-}
-
-int ReplSemiSyncMaster::reserveSyncHeader(unsigned char *header,
-					  unsigned long size)
-{
-  const char *kWho = "ReplSemiSyncMaster::reserveSyncHeader";
-  function_enter(kWho);
-
-  int hlen=0;
-  if (!is_semi_sync_slave())
-  {
-    hlen= 0;
-  }
-  else
-  {
-    /* No enough space for the extra header, disable semi-sync master */
-    if (sizeof(kSyncHeader) > size)
-    {
-      sql_print_warning("No enough space in the packet "
-                        "for semi-sync extra header, "
-                        "semi-sync replication disabled");
-      disableMaster();
-      return 0;
-    }
-    
-    /* Set the magic number and the sync status.  By default, no sync
-     * is required.
-     */
-    memcpy(header, kSyncHeader, sizeof(kSyncHeader));
-    hlen= sizeof(kSyncHeader);
-  }
-  return function_exit(kWho, hlen);
-}
-
-int ReplSemiSyncMaster::updateSyncHeader(unsigned char *packet,
-					 const char *log_file_name,
-					 my_off_t log_file_pos,
-					 uint32 server_id)
-{
-  const char *kWho = "ReplSemiSyncMaster::updateSyncHeader";
-  int  cmp = 0;
-  bool sync = false;
-
-  /* If the semi-sync master is not enabled, or the slave is not a semi-sync
-   * target, do not request replies from the slave.
-   */
-  if (!getMasterEnabled() || !is_semi_sync_slave())
-    return 0;
-
-  function_enter(kWho);
-
-  lock();
-
-  /* This is the real check inside the mutex. */
-  if (!getMasterEnabled())
-    goto l_end; // sync= false at this point in time
-
-  if (is_on())
-  {
-    /* semi-sync is ON */
-    /* sync= false; No sync unless a transaction is involved. */
-
-    if (reply_file_name_inited_)
-    {
-      cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                                 reply_file_name_, reply_file_pos_);
-      if (cmp <= 0)
-      {
-        /* If we have already got the reply for the event, then we do
-         * not need to sync the transaction again.
-         */
-        goto l_end;
-      }
-    }
-
-    if (wait_file_name_inited_)
-    {
-      cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                                 wait_file_name_, wait_file_pos_);
-    }
-    else
-    {
-      cmp = 1;
-    }
-    
-    /* If we are already waiting for some transaction replies which
-     * are later in binlog, do not wait for this one event.
-     */
-    if (cmp >= 0)
-    {
-      /* 
-       * We only wait if the event is a transaction's ending event.
-       */
-      assert(active_tranxs_ != NULL);
-      sync = active_tranxs_->is_tranx_end_pos(log_file_name,
-                                               log_file_pos);
-    }
-  }
-  else
-  {
-    if (commit_file_name_inited_)
-    {
-      int cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                                     commit_file_name_, commit_file_pos_);
-      sync = (cmp >= 0);
-    }
-    else
-    {
-      sync = true;
-    }
-  }
-
-  if (trace_level_ & kTraceDetail)
-    sql_print_information("%s: server(%d), (%s, %lu) sync(%d), repl(%d)",
-                          kWho, server_id, log_file_name,
-                          (unsigned long)log_file_pos, sync, (int)is_on());
-
- l_end:
-  unlock();
-
-  /* We do not need to clear sync flag because we set it to 0 when we
-   * reserve the packet header.
-   */
-  if (sync)
-  {
-    (packet)[2] = kPacketFlagSync;
-  }
-
-  return function_exit(kWho, 0);
-}
-
-int ReplSemiSyncMaster::writeTranxInBinlog(const char* log_file_name,
-					   my_off_t log_file_pos)
-{
-  const char *kWho = "ReplSemiSyncMaster::writeTranxInBinlog";
-  int result = 0;
-
-  function_enter(kWho);
-
-  lock();
-
-  /* This is the real check inside the mutex. */
-  if (!getMasterEnabled())
-    goto l_end;
-
-  /* Update the 'largest' transaction commit position seen so far even
-   * though semi-sync is switched off.
-   * It is much better that we update commit_file_* here, instead of
-   * inside commitTrx().  This is mostly because updateSyncHeader()
-   * will watch for commit_file_* to decide whether to switch semi-sync
-   * on. The detailed reason is explained in function updateSyncHeader().
-   */
-  if (commit_file_name_inited_)
-  {
-    int cmp = ActiveTranx::compare(log_file_name, log_file_pos,
-                                   commit_file_name_, commit_file_pos_);
-    if (cmp > 0)
-    {
-      /* This is a larger position, let's update the maximum info. */
-      strncpy(commit_file_name_, log_file_name, FN_REFLEN-1);
-      commit_file_name_[FN_REFLEN-1] = 0; /* make sure it ends properly */
-      commit_file_pos_ = log_file_pos;
-    }
-  }
-  else
-  {
-    strncpy(commit_file_name_, log_file_name, FN_REFLEN-1);
-    commit_file_name_[FN_REFLEN-1] = 0; /* make sure it ends properly */
-    commit_file_pos_ = log_file_pos;
-    commit_file_name_inited_ = true;
-  }
-
-  if (is_on())
-  {
-    assert(active_tranxs_ != NULL);
-    if(active_tranxs_->insert_tranx_node(log_file_name, log_file_pos))
-    {
-      /*
-        if insert tranx_node failed, print a warning message
-        and turn off semi-sync
-      */
-      sql_print_warning("Semi-sync failed to insert tranx_node for binlog file: %s, position: %lu",
-                        log_file_name, (ulong)log_file_pos);
-      switch_off();
-    }
-  }
-
- l_end:
-  unlock();
-
-  return function_exit(kWho, result);
-}
-
-int ReplSemiSyncMaster::readSlaveReply(NET *net, uint32 server_id,
-                                       const char *event_buf)
-{
-  const char *kWho = "ReplSemiSyncMaster::readSlaveReply";
-  const unsigned char *packet;
-  char     log_file_name[FN_REFLEN];
-  my_off_t log_file_pos;
-  ulong    log_file_len = 0;
-  ulong    packet_len;
-  int      result = -1;
-  struct timespec start_ts;
-  ulong trc_level = trace_level_;
-  LINT_INIT_STRUCT(start_ts);
-
-  function_enter(kWho);
-
-  assert((unsigned char)event_buf[1] == kPacketMagicNum);
-  if ((unsigned char)event_buf[2] != kPacketFlagSync)
-  {
-    /* current event does not require reply */
-    result = 0;
-    goto l_end;
-  }
-
-  if (trc_level & kTraceNetWait)
-    set_timespec(start_ts, 0);
-
-  /* We flush to make sure that the current event is sent to the network,
-   * instead of being buffered in the TCP/IP stack.
-   */
-  if (net_flush(net))
-  {
-    sql_print_error("Semi-sync master failed on net_flush() "
-                    "before waiting for slave reply");
-    goto l_end;
-  }
-
-  net_clear(net, 0);
-  if (trc_level & kTraceDetail)
-    sql_print_information("%s: Wait for replica's reply", kWho);
-
-  /* Wait for the network here.  Though binlog dump thread can indefinitely wait
-   * here, transactions would not wait indefintely.
-   * Transactions wait on binlog replies detected by binlog dump threads.  If
-   * binlog dump threads wait too long, transactions will timeout and continue.
-   */
-  packet_len = my_net_read(net);
-
-  if (trc_level & kTraceNetWait)
-  {
-    int wait_time = getWaitTime(start_ts);
-    if (wait_time < 0)
-    {
-      sql_print_error("Semi-sync master wait for reply "
-                      "fail to get wait time.");
-      rpl_semi_sync_master_timefunc_fails++;
-    }
-    else
-    {
-      rpl_semi_sync_master_net_wait_num++;
-      rpl_semi_sync_master_net_wait_time += wait_time;
-    }
-  }
-
-  if (packet_len == packet_error || packet_len < REPLY_BINLOG_NAME_OFFSET)
-  {
-    if (packet_len == packet_error)
-      sql_print_error("Read semi-sync reply network error: %s (errno: %d)",
-                      net->last_error, net->last_errno);
-    else
-      sql_print_error("Read semi-sync reply length error: %s (errno: %d)",
-                      net->last_error, net->last_errno);
-    goto l_end;
-  }
-
-  packet = net->read_pos;
-  if (packet[REPLY_MAGIC_NUM_OFFSET] != ReplSemiSyncMaster::kPacketMagicNum)
-  {
-    sql_print_error("Read semi-sync reply magic number error");
-    goto l_end;
-  }
-
-  log_file_pos = uint8korr(packet + REPLY_BINLOG_POS_OFFSET);
-  log_file_len = packet_len - REPLY_BINLOG_NAME_OFFSET;
-  if (log_file_len >= FN_REFLEN)
-  {
-    sql_print_error("Read semi-sync reply binlog file length too large");
-    goto l_end;
-  }
-  strncpy(log_file_name, (const char*)packet + REPLY_BINLOG_NAME_OFFSET, log_file_len);
-  log_file_name[log_file_len] = 0;
-
-  if (trc_level & kTraceDetail)
-    sql_print_information("%s: Got reply (%s, %lu)",
-                          kWho, log_file_name, (ulong)log_file_pos);
-
-  result = reportReplyBinlog(server_id, log_file_name, log_file_pos);
-
- l_end:
-  return function_exit(kWho, result);
-}
-
-
-int ReplSemiSyncMaster::resetMaster()
-{
-  const char *kWho = "ReplSemiSyncMaster::resetMaster";
-  int result = 0;
-
-  function_enter(kWho);
-
-
-  lock();
-
-  state_ = getMasterEnabled()? 1 : 0;
-
-  wait_file_name_inited_   = false;
-  reply_file_name_inited_  = false;
-  commit_file_name_inited_ = false;
-
-  rpl_semi_sync_master_yes_transactions = 0;
-  rpl_semi_sync_master_no_transactions = 0;
-  rpl_semi_sync_master_off_times = 0;
-  rpl_semi_sync_master_timefunc_fails = 0;
-  rpl_semi_sync_master_wait_sessions = 0;
-  rpl_semi_sync_master_wait_pos_backtraverse = 0;
-  rpl_semi_sync_master_trx_wait_num = 0;
-  rpl_semi_sync_master_trx_wait_time = 0;
-  rpl_semi_sync_master_net_wait_num = 0;
-  rpl_semi_sync_master_net_wait_time = 0;
-
-  unlock();
-
-  return function_exit(kWho, result);
-}
-
-void ReplSemiSyncMaster::setExportStats()
-{
-  lock();
-
-  rpl_semi_sync_master_status           = state_;
-  rpl_semi_sync_master_avg_trx_wait_time=
-    ((rpl_semi_sync_master_trx_wait_num) ?
-     (unsigned long)((double)rpl_semi_sync_master_trx_wait_time /
-                     ((double)rpl_semi_sync_master_trx_wait_num)) : 0);
-  rpl_semi_sync_master_avg_net_wait_time=
-    ((rpl_semi_sync_master_net_wait_num) ?
-     (unsigned long)((double)rpl_semi_sync_master_net_wait_time /
-                     ((double)rpl_semi_sync_master_net_wait_num)) : 0);
-
-  unlock();
-}
-
-/* Get the waiting time given the wait's staring time.
- * 
- * Return:
- *  >= 0: the waiting time in microsecons(us)
- *   < 0: error in get time or time back traverse
- */
-static int getWaitTime(const struct timespec& start_ts)
-{
-  unsigned long long start_usecs, end_usecs;
-  struct timespec end_ts;
-  
-  /* Starting time in microseconds(us). */
-  start_usecs = timespec_to_usec(&start_ts);
-
-  /* Get the wait time interval. */
-  set_timespec(end_ts, 0);
-
-  /* Ending time in microseconds(us). */
-  end_usecs = timespec_to_usec(&end_ts);
-
-  if (end_usecs < start_usecs)
-    return -1;
-
-  return (int)(end_usecs - start_usecs);
-}
diff --git a/plugin/semisync/semisync_master.h b/plugin/semisync/semisync_master.h
deleted file mode 100644
index c2862476ec8..00000000000
--- a/plugin/semisync/semisync_master.h
+++ /dev/null
@@ -1,632 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (c) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
-   Use is subject to license terms.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#ifndef SEMISYNC_MASTER_H
-#define SEMISYNC_MASTER_H
-
-#include "semisync.h"
-
-#ifdef HAVE_PSI_INTERFACE
-extern PSI_mutex_key key_ss_mutex_LOCK_binlog_;
-extern PSI_cond_key key_ss_cond_COND_binlog_send_;
-#endif
-
-extern PSI_stage_info stage_waiting_for_semi_sync_ack_from_slave;
-
-struct TranxNode {
-  char             log_name_[FN_REFLEN];
-  my_off_t          log_pos_;
-  struct TranxNode *next_;            /* the next node in the sorted list */
-  struct TranxNode *hash_next_;    /* the next node during hash collision */
-};
-
-/**
-  @class TranxNodeAllocator
-
-  This class provides memory allocating and freeing methods for
-  TranxNode. The main target is performance.
-
-  @section ALLOCATE How to allocate a node
-    The pointer of the first node after 'last_node' in current_block is
-    returned. current_block will move to the next free Block when all nodes of
-    it are in use. A new Block is allocated and is put into the rear of the
-    Block link table if no Block is free.
-
-    The list starts up empty (ie, there is no allocated Block).
-
-    After some nodes are freed, there probably are some free nodes before
-    the sequence of the allocated nodes, but we do not reuse it. It is better
-    to keep the allocated nodes are in the sequence, for it is more efficient
-    for allocating and freeing TranxNode.
-
-  @section FREENODE How to free nodes
-    There are two methods for freeing nodes. They are free_all_nodes and
-    free_nodes_before.
-
-    'A Block is free' means all of its nodes are free.
-    @subsection free_nodes_before
-    As all allocated nodes are in the sequence, 'Before one node' means all
-    nodes before given node in the same Block and all Blocks before the Block
-    which containing the given node. As such, all Blocks before the given one
-    ('node') are free Block and moved into the rear of the Block link table.
-    The Block containing the given 'node', however, is not. For at least the
-    given 'node' is still in use. This will waste at most one Block, but it is
-    more efficient.
- */
-#define BLOCK_TRANX_NODES 16
-class TranxNodeAllocator
-{
-public:
-  /**
-    @param reserved_nodes
-      The number of reserved TranxNodes. It is used to set 'reserved_blocks'
-      which can contain at least 'reserved_nodes' number of TranxNodes.  When
-      freeing memory, we will reserve at least reserved_blocks of Blocks not
-      freed.
-   */
-  TranxNodeAllocator(uint reserved_nodes) :
-    reserved_blocks(reserved_nodes/BLOCK_TRANX_NODES +
-                  (reserved_nodes%BLOCK_TRANX_NODES > 1 ? 2 : 1)),
-    first_block(NULL), last_block(NULL),
-    current_block(NULL), last_node(-1), block_num(0) {}
-
-  ~TranxNodeAllocator()
-  {
-    Block *block= first_block;
-    while (block != NULL)
-    {
-      Block *next= block->next;
-      free_block(block);
-      block= next;
-    }
-  }
-
-  /**
-    The pointer of the first node after 'last_node' in current_block is
-    returned. current_block will move to the next free Block when all nodes of
-    it are in use. A new Block is allocated and is put into the rear of the
-    Block link table if no Block is free.
-
-    @return Return a TranxNode *, or NULL if an error occurred.
-   */
-  TranxNode *allocate_node()
-  {
-    TranxNode *trx_node;
-    Block *block= current_block;
-
-    if (last_node == BLOCK_TRANX_NODES-1)
-    {
-      current_block= current_block->next;
-      last_node= -1;
-    }
-
-    if (current_block == NULL && allocate_block())
-    {
-      current_block= block;
-      if (current_block)
-        last_node= BLOCK_TRANX_NODES-1;
-      return NULL;
-    }
-
-    trx_node= &(current_block->nodes[++last_node]);
-    trx_node->log_name_[0] = '\0';
-    trx_node->log_pos_= 0;
-    trx_node->next_= 0;
-    trx_node->hash_next_= 0;
-    return trx_node;
-  }
-
-  /**
-    All nodes are freed.
-
-    @return Return 0, or 1 if an error occurred.
-   */
-  int free_all_nodes()
-  {
-    current_block= first_block;
-    last_node= -1;
-    free_blocks();
-    return 0;
-  }
-
-  /**
-    All Blocks before the given 'node' are free Block and moved into the rear
-    of the Block link table.
-
-    @param node All nodes before 'node' will be freed
-
-    @return Return 0, or 1 if an error occurred.
-   */
-  int free_nodes_before(TranxNode* node)
-  {
-    Block *block;
-    Block *prev_block= NULL;
-
-    block= first_block;
-    while (block != current_block->next)
-    {
-      /* Find the Block containing the given node */
-      if (&(block->nodes[0]) <= node && &(block->nodes[BLOCK_TRANX_NODES]) >= node)
-      {
-        /* All Blocks before the given node are put into the rear */
-        if (first_block != block)
-        {
-          last_block->next= first_block;
-          first_block= block;
-          last_block= prev_block;
-          last_block->next= NULL;
-          free_blocks();
-        }
-        return 0;
-      }
-      prev_block= block;
-      block= block->next;
-    }
-
-    /* Node does not find should never happen */
-    DBUG_ASSERT(0);
-    return 1;
-  }
-
-private:
-  uint reserved_blocks;
-
- /**
-   A sequence memory which contains BLOCK_TRANX_NODES TranxNodes.
-
-   BLOCK_TRANX_NODES The number of TranxNodes which are in a Block.
-
-   next Every Block has a 'next' pointer which points to the next Block.
-        These linking Blocks constitute a Block link table.
-  */
-  struct Block {
-    Block *next;
-    TranxNode nodes[BLOCK_TRANX_NODES];
-  };
-
-  /**
-    The 'first_block' is the head of the Block link table;
-   */
-  Block *first_block;
-  /**
-    The 'last_block' is the rear of the Block link table;
-   */
-  Block *last_block;
-
-  /**
-    current_block always points the Block in the Block link table in
-    which the last allocated node is. The Blocks before it are all in use
-    and the Blocks after it are all free.
-   */
-  Block *current_block;
-
-  /**
-    It always points to the last node which has been allocated in the
-    current_block.
-   */
-  int last_node;
-
-  /**
-    How many Blocks are in the Block link table.
-   */
-  uint block_num;
-
-  /**
-    Allocate a block and then assign it to current_block.
-  */
-  int allocate_block()
-  {
-    Block *block= (Block *)my_malloc(sizeof(Block), MYF(0));
-    if (block)
-    {
-      block->next= NULL;
-
-      if (first_block == NULL)
-        first_block= block;
-      else
-        last_block->next= block;
-
-      /* New Block is always put into the rear */
-      last_block= block;
-      /* New Block is always the current_block */
-      current_block= block;
-      ++block_num;
-      return 0;
-    }
-    return 1;
-  }
-
-  /**
-    Free a given Block.
-    @param block The Block will be freed.
-   */
-  void free_block(Block *block)
-  {
-    my_free(block);
-    --block_num;
-  }
-
-
-  /**
-    If there are some free Blocks and the total number of the Blocks in the
-    Block link table is larger than the 'reserved_blocks', Some free Blocks
-    will be freed until the total number of the Blocks is equal to the
-    'reserved_blocks' or there is only one free Block behind the
-    'current_block'.
-   */
-  void free_blocks()
-  {
-    if (current_block == NULL || current_block->next == NULL)
-      return;
-
-    /* One free Block is always kept behind the current block */
-    Block *block= current_block->next->next;
-    while (block_num > reserved_blocks && block != NULL)
-    {
-      Block *next= block->next;
-      free_block(block);
-      block= next;
-    }
-    current_block->next->next= block;
-    if (block == NULL)
-      last_block= current_block->next;
-  }
-};
-
-/**
-   This class manages memory for active transaction list.
-
-   We record each active transaction with a TranxNode, each session
-   can have only one open transaction. Because of EVENT, the total
-   active transaction nodes can exceed the maximum allowed
-   connections.
-*/
-class ActiveTranx
-  :public Trace {
-private:
-
-  TranxNodeAllocator allocator_;
-  /* These two record the active transaction list in sort order. */
-  TranxNode       *trx_front_, *trx_rear_;
-
-  TranxNode      **trx_htb_;        /* A hash table on active transactions. */
-
-  int              num_entries_;              /* maximum hash table entries */
-  mysql_mutex_t *lock_;                                     /* mutex lock */
-
-  inline void assert_lock_owner();
-
-  inline unsigned int calc_hash(const unsigned char *key,unsigned int length);
-  unsigned int get_hash_value(const char *log_file_name, my_off_t log_file_pos);
-
-  int compare(const char *log_file_name1, my_off_t log_file_pos1,
-              const TranxNode *node2) {
-    return compare(log_file_name1, log_file_pos1,
-                   node2->log_name_, node2->log_pos_);
-  }
-  int compare(const TranxNode *node1,
-              const char *log_file_name2, my_off_t log_file_pos2) {
-    return compare(node1->log_name_, node1->log_pos_,
-                   log_file_name2, log_file_pos2);
-  }
-  int compare(const TranxNode *node1, const TranxNode *node2) {
-    return compare(node1->log_name_, node1->log_pos_,
-                   node2->log_name_, node2->log_pos_);
-  }
-
-public:
-  ActiveTranx(mysql_mutex_t *lock, unsigned long trace_level);
-  ~ActiveTranx();
-
-  /* Insert an active transaction node with the specified position.
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int insert_tranx_node(const char *log_file_name, my_off_t log_file_pos);
-
-  /* Clear the active transaction nodes until(inclusive) the specified
-   * position.
-   * If log_file_name is NULL, everything will be cleared: the sorted
-   * list and the hash table will be reset to empty.
-   * 
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int clear_active_tranx_nodes(const char *log_file_name,
-                               my_off_t    log_file_pos);
-
-  /* Given a position, check to see whether the position is an active
-   * transaction's ending position by probing the hash table.
-   */
-  bool is_tranx_end_pos(const char *log_file_name, my_off_t log_file_pos);
-
-  /* Given two binlog positions, compare which one is bigger based on
-   * (file_name, file_position).
-   */
-  static int compare(const char *log_file_name1, my_off_t log_file_pos1,
-                     const char *log_file_name2, my_off_t log_file_pos2);
-
-};
-
-/**
-   The extension class for the master of semi-synchronous replication
-*/
-class ReplSemiSyncMaster
-  :public ReplSemiSyncBase {
- private:
-  ActiveTranx    *active_tranxs_;  /* active transaction list: the list will
-                                      be cleared when semi-sync switches off. */
-
-  /* True when initObject has been called */
-  bool init_done_;
-
-  /* This cond variable is signaled when enough binlog has been sent to slave,
-   * so that a waiting trx can return the 'ok' to the client for a commit.
-   */
-  mysql_cond_t  COND_binlog_send_;
-
-  /* Mutex that protects the following state variables and the active
-   * transaction list.
-   * Under no cirumstances we can acquire mysql_bin_log.LOCK_log if we are
-   * already holding LOCK_binlog_ because it can cause deadlocks.
-   */
-  mysql_mutex_t LOCK_binlog_;
-
-  /* This is set to true when reply_file_name_ contains meaningful data. */
-  bool            reply_file_name_inited_;
-
-  /* The binlog name up to which we have received replies from any slaves. */
-  char            reply_file_name_[FN_REFLEN];
-
-  /* The position in that file up to which we have the reply from any slaves. */
-  my_off_t        reply_file_pos_;
-
-  /* This is set to true when we know the 'smallest' wait position. */
-  bool            wait_file_name_inited_;
-
-  /* NULL, or the 'smallest' filename that a transaction is waiting for
-   * slave replies.
-   */
-  char            wait_file_name_[FN_REFLEN];
-
-  /* The smallest position in that file that a trx is waiting for: the trx
-   * can proceed and send an 'ok' to the client when the master has got the
-   * reply from the slave indicating that it already got the binlog events.
-   */
-  my_off_t        wait_file_pos_;
-
-  /* This is set to true when we know the 'largest' transaction commit
-   * position in the binlog file.
-   * We always maintain the position no matter whether semi-sync is switched
-   * on switched off.  When a transaction wait timeout occurs, semi-sync will
-   * switch off.  Binlog-dump thread can use the three fields to detect when
-   * slaves catch up on replication so that semi-sync can switch on again.
-   */
-  bool            commit_file_name_inited_;
-
-  /* The 'largest' binlog filename that a commit transaction is seeing.       */
-  char            commit_file_name_[FN_REFLEN];
-
-  /* The 'largest' position in that file that a commit transaction is seeing. */
-  my_off_t        commit_file_pos_;
-
-  /* All global variables which can be set by parameters. */
-  volatile bool            master_enabled_;      /* semi-sync is enabled on the master */
-  unsigned long           wait_timeout_;      /* timeout period(ms) during tranx wait */
-
-  bool            state_;                    /* whether semi-sync is switched */
-
-  void lock();
-  void unlock();
-  void cond_broadcast();
-  int  cond_timewait(struct timespec *wait_time);
-
-  /* Is semi-sync replication on? */
-  bool is_on() {
-    return (state_);
-  }
-
-  void set_master_enabled(bool enabled) {
-    master_enabled_ = enabled;
-  }
-
-  /* Switch semi-sync off because of timeout in transaction waiting. */
-  int switch_off();
-
-  /* Switch semi-sync on when slaves catch up. */
-  int try_switch_on(int server_id,
-                    const char *log_file_name, my_off_t log_file_pos);
-
- public:
-  ReplSemiSyncMaster();
-  ~ReplSemiSyncMaster() {}
-
-  void cleanup();
-
-  bool getMasterEnabled() {
-    return master_enabled_;
-  }
-  void setTraceLevel(unsigned long trace_level) {
-    trace_level_ = trace_level;
-    if (active_tranxs_)
-      active_tranxs_->trace_level_ = trace_level;
-  }
-
-  /* Set the transaction wait timeout period, in milliseconds. */
-  void setWaitTimeout(unsigned long wait_timeout) {
-    wait_timeout_ = wait_timeout;
-  }
-
-  /* Initialize this class after MySQL parameters are initialized. this
-   * function should be called once at bootstrap time.
-   */
-  int initObject();
-
-  /* Enable the object to enable semi-sync replication inside the master. */
-  int enableMaster();
-
-  /* Enable the object to enable semi-sync replication inside the master. */
-  int disableMaster();
-
-  /* Add a semi-sync replication slave */
-  void add_slave();
-    
-  /* Remove a semi-sync replication slave */
-  void remove_slave();
-
-  /* Is the slave servered by the thread requested semi-sync */
-  bool is_semi_sync_slave();
-
-  /* In semi-sync replication, reports up to which binlog position we have
-   * received replies from the slave indicating that it already get the events.
-   *
-   * Input:
-   *  server_id     - (IN)  master server id number
-   *  log_file_name - (IN)  binlog file name
-   *  end_offset    - (IN)  the offset in the binlog file up to which we have
-   *                        the replies from the slave
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int reportReplyBinlog(uint32 server_id,
-                        const char* log_file_name,
-                        my_off_t end_offset);
-
-  /* Commit a transaction in the final step.  This function is called from
-   * InnoDB before returning from the low commit.  If semi-sync is switch on,
-   * the function will wait to see whether binlog-dump thread get the reply for
-   * the events of the transaction.  Remember that this is not a direct wait,
-   * instead, it waits to see whether the binlog-dump thread has reached the
-   * point.  If the wait times out, semi-sync status will be switched off and
-   * all other transaction would not wait either.
-   *
-   * Input:  (the transaction events' ending binlog position)
-   *  trx_wait_binlog_name - (IN)  ending position's file name
-   *  trx_wait_binlog_pos  - (IN)  ending position's file offset
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int commitTrx(const char* trx_wait_binlog_name,
-                my_off_t trx_wait_binlog_pos);
-
-  /* Reserve space in the replication event packet header:
-   *  . slave semi-sync off: 1 byte - (0)
-   *  . slave semi-sync on:  3 byte - (0, 0xef, 0/1}
-   * 
-   * Input:
-   *  header   - (IN)  the header buffer
-   *  size     - (IN)  size of the header buffer
-   *
-   * Return:
-   *  size of the bytes reserved for header
-   */
-  int reserveSyncHeader(unsigned char *header, unsigned long size);
-
-  /* Update the sync bit in the packet header to indicate to the slave whether
-   * the master will wait for the reply of the event.  If semi-sync is switched
-   * off and we detect that the slave is catching up, we switch semi-sync on.
-   * 
-   * Input:
-   *  packet        - (IN)  the packet containing the replication event
-   *  log_file_name - (IN)  the event ending position's file name
-   *  log_file_pos  - (IN)  the event ending position's file offset
-   *  server_id     - (IN)  master server id number
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int updateSyncHeader(unsigned char *packet,
-                       const char *log_file_name,
-		       my_off_t log_file_pos,
-		       uint32 server_id);
-
-  /* Called when a transaction finished writing binlog events.
-   *  . update the 'largest' transactions' binlog event position
-   *  . insert the ending position in the active transaction list if
-   *    semi-sync is on
-   * 
-   * Input:  (the transaction events' ending binlog position)
-   *  log_file_name - (IN)  transaction ending position's file name
-   *  log_file_pos  - (IN)  transaction ending position's file offset
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int writeTranxInBinlog(const char* log_file_name, my_off_t log_file_pos);
-
-  /* Read the slave's reply so that we know how much progress the slave makes
-   * on receive replication events.
-   * 
-   * Input:
-   *  net          - (IN)  the connection to master
-   *  server_id    - (IN)  master server id number
-   *  event_buf    - (IN)  pointer to the event packet
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int readSlaveReply(NET *net, uint32 server_id, const char *event_buf);
-
-  /* Export internal statistics for semi-sync replication. */
-  void setExportStats();
-
-  /* 'reset master' command is issued from the user and semi-sync need to
-   * go off for that.
-   */
-  int resetMaster();
-};
-
-enum rpl_semi_sync_master_wait_point_t {
-  SEMI_SYNC_MASTER_WAIT_POINT_AFTER_BINLOG_SYNC,
-  SEMI_SYNC_MASTER_WAIT_POINT_AFTER_STORAGE_COMMIT,
-};
-
-/* System and status variables for the master component */
-extern char rpl_semi_sync_master_enabled;
-extern char rpl_semi_sync_master_status;
-extern unsigned long rpl_semi_sync_master_wait_point;
-extern unsigned long rpl_semi_sync_master_clients;
-extern unsigned long rpl_semi_sync_master_timeout;
-extern unsigned long rpl_semi_sync_master_trace_level;
-extern unsigned long rpl_semi_sync_master_yes_transactions;
-extern unsigned long rpl_semi_sync_master_no_transactions;
-extern unsigned long rpl_semi_sync_master_off_times;
-extern unsigned long rpl_semi_sync_master_wait_timeouts;
-extern unsigned long rpl_semi_sync_master_timefunc_fails;
-extern unsigned long rpl_semi_sync_master_num_timeouts;
-extern unsigned long rpl_semi_sync_master_wait_sessions;
-extern unsigned long rpl_semi_sync_master_wait_pos_backtraverse;
-extern unsigned long rpl_semi_sync_master_avg_trx_wait_time;
-extern unsigned long rpl_semi_sync_master_avg_net_wait_time;
-extern unsigned long long rpl_semi_sync_master_net_wait_num;
-extern unsigned long long rpl_semi_sync_master_trx_wait_num;
-extern unsigned long long rpl_semi_sync_master_net_wait_time;
-extern unsigned long long rpl_semi_sync_master_trx_wait_time;
-
-/*
-  This indicates whether we should keep waiting if no semi-sync slave
-  is available.
-     0           : stop waiting if detected no avaialable semi-sync slave.
-     1 (default) : keep waiting until timeout even no available semi-sync slave.
-*/
-extern char rpl_semi_sync_master_wait_no_slave;
-
-#endif /* SEMISYNC_MASTER_H */
diff --git a/plugin/semisync/semisync_master_plugin.cc b/plugin/semisync/semisync_master_plugin.cc
deleted file mode 100644
index b46cf5d79cb..00000000000
--- a/plugin/semisync/semisync_master_plugin.cc
+++ /dev/null
@@ -1,496 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (c) 2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
-   Use is subject to license terms.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#include <my_global.h>
-#include "semisync_master.h"
-#include "sql_class.h"                          // THD
-
-static ReplSemiSyncMaster repl_semisync;
-
-C_MODE_START
-
-int repl_semi_report_binlog_update(Binlog_storage_param *param,
-				   const char *log_file,
-				   my_off_t log_pos, uint32 flags)
-{
-  int  error= 0;
-
-  if (repl_semisync.getMasterEnabled())
-  {
-    /*
-      Let us store the binlog file name and the position, so that
-      we know how long to wait for the binlog to the replicated to
-      the slave in synchronous replication.
-    */
-    error= repl_semisync.writeTranxInBinlog(log_file,
-                                            log_pos);
-  }
-
-  return error;
-}
-
-int repl_semi_request_commit(Trans_param *param)
-{
-  return 0;
-}
-
-int repl_semi_report_binlog_sync(Binlog_storage_param *param,
-                                 const char *log_file,
-                                 my_off_t log_pos, uint32 flags)
-{
-  int error= 0;
-  if (rpl_semi_sync_master_wait_point ==
-      SEMI_SYNC_MASTER_WAIT_POINT_AFTER_BINLOG_SYNC)
-  {
-    error = repl_semisync.commitTrx(log_file, log_pos);
-  }
-
-  return error;
-}
-
-int repl_semi_report_commit(Trans_param *param)
-{
-  if (rpl_semi_sync_master_wait_point !=
-      SEMI_SYNC_MASTER_WAIT_POINT_AFTER_STORAGE_COMMIT)
-  {
-    return 0;
-  }
-
-  bool is_real_trans= param->flags & TRANS_IS_REAL_TRANS;
-
-  if (is_real_trans && param->log_pos)
-  {
-    const char *binlog_name= param->log_file;
-    return repl_semisync.commitTrx(binlog_name, param->log_pos);
-  }
-  return 0;
-}
-
-int repl_semi_report_rollback(Trans_param *param)
-{
-  return repl_semi_report_commit(param);
-}
-
-int repl_semi_binlog_dump_start(Binlog_transmit_param *param,
-				 const char *log_file,
-				 my_off_t log_pos)
-{
-  bool semi_sync_slave= repl_semisync.is_semi_sync_slave();
-  
-  if (semi_sync_slave)
-  {
-    /* One more semi-sync slave */
-    repl_semisync.add_slave();
-    
-    /*
-      Let's assume this semi-sync slave has already received all
-      binlog events before the filename and position it requests.
-    */
-    repl_semisync.reportReplyBinlog(param->server_id, log_file, log_pos);
-  }
-  sql_print_information("Start %s binlog_dump to slave (server_id: %d), pos(%s, %lu)",
-			semi_sync_slave ? "semi-sync" : "asynchronous",
-			param->server_id, log_file, (unsigned long)log_pos);
-  
-  return 0;
-}
-
-int repl_semi_binlog_dump_end(Binlog_transmit_param *param)
-{
-  bool semi_sync_slave= repl_semisync.is_semi_sync_slave();
-  
-  sql_print_information("Stop %s binlog_dump to slave (server_id: %d)",
-                        semi_sync_slave ? "semi-sync" : "asynchronous",
-                        param->server_id);
-  if (semi_sync_slave)
-  {
-    /* One less semi-sync slave */
-    repl_semisync.remove_slave();
-  }
-  return 0;
-}
-
-int repl_semi_reserve_header(Binlog_transmit_param *param,
-			     unsigned char *header,
-			     unsigned long size, unsigned long *len)
-{
-  *len +=  repl_semisync.reserveSyncHeader(header, size);
-  return 0;
-}
-
-int repl_semi_before_send_event(Binlog_transmit_param *param,
-                                unsigned char *packet, unsigned long len,
-                                const char *log_file, my_off_t log_pos)
-{
-  return repl_semisync.updateSyncHeader(packet,
-					log_file,
-					log_pos,
-					param->server_id);
-}
-
-int repl_semi_after_send_event(Binlog_transmit_param *param,
-                               const char *event_buf, unsigned long len)
-{
-  if (repl_semisync.is_semi_sync_slave())
-  {
-    THD *thd= current_thd;
-    /*
-      Possible errors in reading slave reply are ignored deliberately
-      because we do not want dump thread to quit on this. Error
-      messages are already reported.
-    */
-    (void) repl_semisync.readSlaveReply(&thd->net,
-                                        param->server_id, event_buf);
-    thd->clear_error();
-  }
-  return 0;
-}
-
-int repl_semi_reset_master(Binlog_transmit_param *param)
-{
-  if (repl_semisync.resetMaster())
-    return 1;
-  return 0;
-}
-
-C_MODE_END
-
-/*
-  semisync system variables
- */
-static void fix_rpl_semi_sync_master_timeout(MYSQL_THD thd,
-				      SYS_VAR *var,
-				      void *ptr,
-				      const void *val);
-
-static void fix_rpl_semi_sync_master_trace_level(MYSQL_THD thd,
-					  SYS_VAR *var,
-					  void *ptr,
-					  const void *val);
-
-static void fix_rpl_semi_sync_master_enabled(MYSQL_THD thd,
-				      SYS_VAR *var,
-				      void *ptr,
-				      const void *val);
-
-static MYSQL_SYSVAR_BOOL(enabled, rpl_semi_sync_master_enabled,
-  PLUGIN_VAR_OPCMDARG,
- "Enable semi-synchronous replication master (disabled by default). ",
-  NULL, 			// check
-  &fix_rpl_semi_sync_master_enabled,	// update
-  0);
-
-/* NOTE: must match order of rpl_semi_sync_master_wait_point_t */
-static const char *rpl_semi_sync_master_wait_point_names[] =
-{
-  "AFTER_SYNC",
-  "AFTER_COMMIT",
-  NullS
-};
-
-static TYPELIB rpl_semi_sync_master_wait_point_typelib =
-{
-  array_elements(rpl_semi_sync_master_wait_point_names) - 1,
-  "",
-  rpl_semi_sync_master_wait_point_names,
-  NULL
-};
-
-static MYSQL_SYSVAR_ENUM(
-    wait_point,
-    rpl_semi_sync_master_wait_point,
-    PLUGIN_VAR_RQCMDARG,
-    "Should transaction wait for semi-sync ack after having synced binlog, "
-    "or after having committed in storeage engine.",
-    NULL, // check
-    NULL, // update
-    SEMI_SYNC_MASTER_WAIT_POINT_AFTER_STORAGE_COMMIT,
-    &rpl_semi_sync_master_wait_point_typelib);
-
-static MYSQL_SYSVAR_ULONG(timeout, rpl_semi_sync_master_timeout,
-  PLUGIN_VAR_OPCMDARG,
- "The timeout value (in ms) for semi-synchronous replication in the master",
-  NULL, 			// check
-  fix_rpl_semi_sync_master_timeout,	// update
-  10000, 0, ~0UL, 1);
-
-static MYSQL_SYSVAR_BOOL(wait_no_slave, rpl_semi_sync_master_wait_no_slave,
-  PLUGIN_VAR_OPCMDARG,
- "Wait until timeout when no semi-synchronous replication slave available (enabled by default). ",
-  NULL, 			// check
-  NULL,                         // update
-  1);
-
-static MYSQL_SYSVAR_ULONG(trace_level, rpl_semi_sync_master_trace_level,
-  PLUGIN_VAR_OPCMDARG,
- "The tracing level for semi-sync replication.",
-  NULL,				  // check
-  &fix_rpl_semi_sync_master_trace_level, // update
-  32, 0, ~0UL, 1);
-
-static SYS_VAR* semi_sync_master_system_vars[]= {
-  MYSQL_SYSVAR(enabled),
-  MYSQL_SYSVAR(wait_point),
-  MYSQL_SYSVAR(timeout),
-  MYSQL_SYSVAR(wait_no_slave),
-  MYSQL_SYSVAR(trace_level),
-  NULL,
-};
-
-
-static void fix_rpl_semi_sync_master_timeout(MYSQL_THD thd,
-				      SYS_VAR *var,
-				      void *ptr,
-				      const void *val)
-{
-  *(unsigned long *)ptr= *(unsigned long *)val;
-  repl_semisync.setWaitTimeout(rpl_semi_sync_master_timeout);
-  return;
-}
-
-static void fix_rpl_semi_sync_master_trace_level(MYSQL_THD thd,
-					  SYS_VAR *var,
-					  void *ptr,
-					  const void *val)
-{
-  *(unsigned long *)ptr= *(unsigned long *)val;
-  repl_semisync.setTraceLevel(rpl_semi_sync_master_trace_level);
-  return;
-}
-
-static void fix_rpl_semi_sync_master_enabled(MYSQL_THD thd,
-				      SYS_VAR *var,
-				      void *ptr,
-				      const void *val)
-{
-  *(char *)ptr= *(char *)val;
-  if (rpl_semi_sync_master_enabled)
-  {
-    if (repl_semisync.enableMaster() != 0)
-      rpl_semi_sync_master_enabled = false;
-  }
-  else
-  {
-    if (repl_semisync.disableMaster() != 0)
-      rpl_semi_sync_master_enabled = true;
-  }
-
-  return;
-}
-
-Trans_observer trans_observer = {
-  sizeof(Trans_observer),		// len
-
-  repl_semi_report_commit,	// after_commit
-  repl_semi_report_rollback,	// after_rollback
-};
-
-Binlog_storage_observer storage_observer = {
-  sizeof(Binlog_storage_observer), // len
-
-  repl_semi_report_binlog_update, // report_update
-  repl_semi_report_binlog_sync,   // after_sync
-};
-
-Binlog_transmit_observer transmit_observer = {
-  sizeof(Binlog_transmit_observer), // len
-
-  repl_semi_binlog_dump_start,	// start
-  repl_semi_binlog_dump_end,	// stop
-  repl_semi_reserve_header,	// reserve_header
-  repl_semi_before_send_event,	// before_send_event
-  repl_semi_after_send_event,	// after_send_event
-  repl_semi_reset_master,	// reset
-};
-
-
-#define SHOW_FNAME(name)			\
-  rpl_semi_sync_master_show_##name
-
-#define DEF_SHOW_FUNC(name, show_type)					\
-  static  int SHOW_FNAME(name)(MYSQL_THD thd, SHOW_VAR *var, char *buff) \
-  {									\
-    repl_semisync.setExportStats();					\
-    var->type= show_type;						\
-    var->value= (char *)&rpl_semi_sync_master_##name;				\
-    return 0;								\
-  }
-
-DEF_SHOW_FUNC(status, SHOW_BOOL)
-DEF_SHOW_FUNC(clients, SHOW_LONG)
-DEF_SHOW_FUNC(wait_sessions, SHOW_LONG)
-DEF_SHOW_FUNC(trx_wait_time, SHOW_LONGLONG)
-DEF_SHOW_FUNC(trx_wait_num, SHOW_LONGLONG)
-DEF_SHOW_FUNC(net_wait_time, SHOW_LONGLONG)
-DEF_SHOW_FUNC(net_wait_num, SHOW_LONGLONG)
-DEF_SHOW_FUNC(avg_net_wait_time, SHOW_LONG)
-DEF_SHOW_FUNC(avg_trx_wait_time, SHOW_LONG)
-
-
-/* plugin status variables */
-static SHOW_VAR semi_sync_master_status_vars[]= {
-  {"Rpl_semi_sync_master_status",
-   (char*) &SHOW_FNAME(status),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_clients",
-   (char*) &SHOW_FNAME(clients),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_yes_tx",
-   (char*) &rpl_semi_sync_master_yes_transactions,
-   SHOW_LONG},
-  {"Rpl_semi_sync_master_no_tx",
-   (char*) &rpl_semi_sync_master_no_transactions,
-   SHOW_LONG},
-  {"Rpl_semi_sync_master_wait_sessions",
-   (char*) &SHOW_FNAME(wait_sessions),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_no_times",
-   (char*) &rpl_semi_sync_master_off_times,
-   SHOW_LONG},
-  {"Rpl_semi_sync_master_timefunc_failures",
-   (char*) &rpl_semi_sync_master_timefunc_fails,
-   SHOW_LONG},
-  {"Rpl_semi_sync_master_wait_pos_backtraverse",
-   (char*) &rpl_semi_sync_master_wait_pos_backtraverse,
-   SHOW_LONG},
-  {"Rpl_semi_sync_master_tx_wait_time",
-   (char*) &SHOW_FNAME(trx_wait_time),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_tx_waits",
-   (char*) &SHOW_FNAME(trx_wait_num),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_tx_avg_wait_time",
-   (char*) &SHOW_FNAME(avg_trx_wait_time),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_net_wait_time",
-   (char*) &SHOW_FNAME(net_wait_time),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_net_waits",
-   (char*) &SHOW_FNAME(net_wait_num),
-   SHOW_SIMPLE_FUNC},
-  {"Rpl_semi_sync_master_net_avg_wait_time",
-   (char*) &SHOW_FNAME(avg_net_wait_time),
-   SHOW_SIMPLE_FUNC},
-  {NULL, NULL, SHOW_LONG},
-};
-
-#ifdef HAVE_PSI_INTERFACE
-PSI_mutex_key key_ss_mutex_LOCK_binlog_;
-
-static PSI_mutex_info all_semisync_mutexes[]=
-{
-  { &key_ss_mutex_LOCK_binlog_, "LOCK_binlog_", 0}
-};
-
-PSI_cond_key key_ss_cond_COND_binlog_send_;
-
-static PSI_cond_info all_semisync_conds[]=
-{
-  { &key_ss_cond_COND_binlog_send_, "COND_binlog_send_", 0}
-};
-#endif /* HAVE_PSI_INTERFACE */
-
-PSI_stage_info stage_waiting_for_semi_sync_ack_from_slave=
-{ 0, "Waiting for semi-sync ACK from slave", 0};
-
-#ifdef HAVE_PSI_INTERFACE
-PSI_stage_info *all_semisync_stages[]=
-{
-  & stage_waiting_for_semi_sync_ack_from_slave
-};
-
-static void init_semisync_psi_keys(void)
-{
-  const char* category= "semisync";
-  int count;
-
-  count= array_elements(all_semisync_mutexes);
-  mysql_mutex_register(category, all_semisync_mutexes, count);
-
-  count= array_elements(all_semisync_conds);
-  mysql_cond_register(category, all_semisync_conds, count);
-
-  count= array_elements(all_semisync_stages);
-  mysql_stage_register(category, all_semisync_stages, count);
-}
-#endif /* HAVE_PSI_INTERFACE */
-
-static int semi_sync_master_plugin_init(void *p)
-{
-#ifdef HAVE_PSI_INTERFACE
-  init_semisync_psi_keys();
-#endif
-
-  if (repl_semisync.initObject())
-    return 1;
-  if (register_trans_observer(&trans_observer, p))
-    return 1;
-  if (register_binlog_storage_observer(&storage_observer, p))
-    return 1;
-  if (register_binlog_transmit_observer(&transmit_observer, p))
-    return 1;
-  return 0;
-}
-
-static int semi_sync_master_plugin_deinit(void *p)
-{
-  if (unregister_trans_observer(&trans_observer, p))
-  {
-    sql_print_error("unregister_trans_observer failed");
-    return 1;
-  }
-  if (unregister_binlog_storage_observer(&storage_observer, p))
-  {
-    sql_print_error("unregister_binlog_storage_observer failed");
-    return 1;
-  }
-  if (unregister_binlog_transmit_observer(&transmit_observer, p))
-  {
-    sql_print_error("unregister_binlog_transmit_observer failed");
-    return 1;
-  }
-  repl_semisync.cleanup();
-  sql_print_information("unregister_replicator OK");
-  return 0;
-}
-
-struct Mysql_replication semi_sync_master_plugin= {
-  MYSQL_REPLICATION_INTERFACE_VERSION
-};
-
-/*
-  Plugin library descriptor
-*/
-maria_declare_plugin(semisync_master)
-{
-  MYSQL_REPLICATION_PLUGIN,
-  &semi_sync_master_plugin,
-  "rpl_semi_sync_master",
-  "He Zhenxing",
-  "Semi-synchronous replication master",
-  PLUGIN_LICENSE_GPL,
-  semi_sync_master_plugin_init, /* Plugin Init */
-  semi_sync_master_plugin_deinit, /* Plugin Deinit */
-  0x0100 /* 1.0 */,
-  semi_sync_master_status_vars,	/* status variables */
-  semi_sync_master_system_vars,	/* system variables */
-  "1.0",
-  MariaDB_PLUGIN_MATURITY_STABLE
-}
-maria_declare_plugin_end;
-
diff --git a/plugin/semisync/semisync_slave.cc b/plugin/semisync/semisync_slave.cc
deleted file mode 100644
index ff8a40aafac..00000000000
--- a/plugin/semisync/semisync_slave.cc
+++ /dev/null
@@ -1,140 +0,0 @@
-/* Copyright (c) 2008 MySQL AB, 2009 Sun Microsystems, Inc.
-   Use is subject to license terms.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#include <my_global.h>
-#include "semisync_slave.h"
-
-char rpl_semi_sync_slave_enabled;
-char rpl_semi_sync_slave_status= 0;
-unsigned long rpl_semi_sync_slave_trace_level;
-
-int ReplSemiSyncSlave::initObject()
-{
-  int result= 0;
-  const char *kWho = "ReplSemiSyncSlave::initObject";
-
-  if (init_done_)
-  {
-    fprintf(stderr, "%s called twice\n", kWho);
-    return 1;
-  }
-  init_done_ = true;
-
-  /* References to the parameter works after set_options(). */
-  setSlaveEnabled(rpl_semi_sync_slave_enabled);
-  setTraceLevel(rpl_semi_sync_slave_trace_level);
-
-  return result;
-}
-
-int ReplSemiSyncSlave::slaveReadSyncHeader(const char *header,
-                                      unsigned long total_len,
-                                      bool  *need_reply,
-                                      const char **payload,
-                                      unsigned long *payload_len)
-{
-  const char *kWho = "ReplSemiSyncSlave::slaveReadSyncHeader";
-  int read_res = 0;
-  function_enter(kWho);
-
-  if ((unsigned char)(header[0]) == kPacketMagicNum)
-  {
-    *need_reply  = (header[1] & kPacketFlagSync);
-    *payload_len = total_len - 2;
-    *payload     = header + 2;
-
-    if (trace_level_ & kTraceDetail)
-      sql_print_information("%s: reply - %d", kWho, *need_reply);
-  }
-  else
-  {
-    sql_print_error("Missing magic number for semi-sync packet, packet "
-                    "len: %lu", total_len);
-    read_res = -1;
-  }
-
-  return function_exit(kWho, read_res);
-}
-
-int ReplSemiSyncSlave::slaveStart(Binlog_relay_IO_param *param)
-{
-  bool semi_sync= getSlaveEnabled();
-  
-  sql_print_information("Slave I/O thread: Start %s replication to\
- master '%s@%s:%d' in log '%s' at position %lu",
-			semi_sync ? "semi-sync" : "asynchronous",
-			param->user, param->host, param->port,
-			param->master_log_name[0] ? param->master_log_name : "FIRST",
-			(unsigned long)param->master_log_pos);
-
-  if (semi_sync && !rpl_semi_sync_slave_status)
-    rpl_semi_sync_slave_status= 1;
-  return 0;
-}
-
-int ReplSemiSyncSlave::slaveStop(Binlog_relay_IO_param *param)
-{
-  if (rpl_semi_sync_slave_status)
-    rpl_semi_sync_slave_status= 0;
-  if (mysql_reply)
-    mysql_close(mysql_reply);
-  mysql_reply= 0;
-  return 0;
-}
-
-int ReplSemiSyncSlave::slaveReply(MYSQL *mysql,
-                                 const char *binlog_filename,
-                                 my_off_t binlog_filepos)
-{
-  const char *kWho = "ReplSemiSyncSlave::slaveReply";
-  NET *net= &mysql->net;
-  uchar reply_buffer[REPLY_MAGIC_NUM_LEN
-                     + REPLY_BINLOG_POS_LEN
-                     + REPLY_BINLOG_NAME_LEN];
-  int  reply_res, name_len = strlen(binlog_filename);
-
-  function_enter(kWho);
-
-  /* Prepare the buffer of the reply. */
-  reply_buffer[REPLY_MAGIC_NUM_OFFSET] = kPacketMagicNum;
-  int8store(reply_buffer + REPLY_BINLOG_POS_OFFSET, binlog_filepos);
-  memcpy(reply_buffer + REPLY_BINLOG_NAME_OFFSET,
-         binlog_filename,
-         name_len + 1 /* including trailing '\0' */);
-
-  if (trace_level_ & kTraceDetail)
-    sql_print_information("%s: reply (%s, %lu)", kWho,
-                          binlog_filename, (ulong)binlog_filepos);
-
-  net_clear(net, 0);
-  /* Send the reply. */
-  reply_res = my_net_write(net, reply_buffer,
-                           name_len + REPLY_BINLOG_NAME_OFFSET);
-  if (!reply_res)
-  {
-    reply_res = net_flush(net);
-    if (reply_res)
-      sql_print_error("Semi-sync slave net_flush() reply failed");
-  }
-  else
-  {
-    sql_print_error("Semi-sync slave send reply failed: %s (%d)",
-                    net->last_error, net->last_errno);
-  }
-
-  return function_exit(kWho, reply_res);
-}
diff --git a/plugin/semisync/semisync_slave.h b/plugin/semisync/semisync_slave.h
deleted file mode 100644
index 1bf8cf31972..00000000000
--- a/plugin/semisync/semisync_slave.h
+++ /dev/null
@@ -1,97 +0,0 @@
-/* Copyright (c) 2006 MySQL AB, 2009 Sun Microsystems, Inc.
-   Use is subject to license terms.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#ifndef SEMISYNC_SLAVE_H
-#define SEMISYNC_SLAVE_H
-
-#include "semisync.h"
-
-/**
-   The extension class for the slave of semi-synchronous replication
-*/
-class ReplSemiSyncSlave
-  :public ReplSemiSyncBase {
-public:
- ReplSemiSyncSlave()
-   :slave_enabled_(false)
-  {}
-  ~ReplSemiSyncSlave() {}
-
-  void setTraceLevel(unsigned long trace_level) {
-    trace_level_ = trace_level;
-  }
-
-  /* Initialize this class after MySQL parameters are initialized. this
-   * function should be called once at bootstrap time.
-   */
-  int initObject();
-
-  bool getSlaveEnabled() {
-    return slave_enabled_;
-  }
-  void setSlaveEnabled(bool enabled) {
-    slave_enabled_ = enabled;
-  }
-
-  /* A slave reads the semi-sync packet header and separate the metadata
-   * from the payload data.
-   * 
-   * Input:
-   *  header      - (IN)  packet header pointer
-   *  total_len   - (IN)  total packet length: metadata + payload
-   *  need_reply  - (IN)  whether the master is waiting for the reply
-   *  payload     - (IN)  payload: the replication event
-   *  payload_len - (IN)  payload length
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int slaveReadSyncHeader(const char *header, unsigned long total_len, bool *need_reply,
-                          const char **payload, unsigned long *payload_len);
-
-  /* A slave replies to the master indicating its replication process.  It
-   * indicates that the slave has received all events before the specified
-   * binlog position.
-   * 
-   * Input:
-   *  mysql            - (IN)  the mysql network connection
-   *  binlog_filename  - (IN)  the reply point's binlog file name
-   *  binlog_filepos   - (IN)  the reply point's binlog file offset
-   *
-   * Return:
-   *  0: success;  non-zero: error
-   */
-  int slaveReply(MYSQL *mysql, const char *binlog_filename,
-                 my_off_t binlog_filepos);
-
-  int slaveStart(Binlog_relay_IO_param *param);
-  int slaveStop(Binlog_relay_IO_param *param);
-
-private:
-  /* True when initObject has been called */
-  bool init_done_;
-  bool slave_enabled_;        /* semi-sycn is enabled on the slave */
-  MYSQL *mysql_reply;         /* connection to send reply */
-};
-
-
-/* System and status variables for the slave component */
-extern char rpl_semi_sync_slave_enabled;
-extern unsigned long rpl_semi_sync_slave_trace_level;
-extern char rpl_semi_sync_slave_status;
-
-#endif /* SEMISYNC_SLAVE_H */
diff --git a/plugin/semisync/semisync_slave_plugin.cc b/plugin/semisync/semisync_slave_plugin.cc
deleted file mode 100644
index df9e8e10429..00000000000
--- a/plugin/semisync/semisync_slave_plugin.cc
+++ /dev/null
@@ -1,234 +0,0 @@
-/* Copyright (C) 2007 Google Inc.
-   Copyright (C) 2008 MySQL AB
-   Use is subject to license terms
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; version 2 of the License.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
-
-
-#include <my_global.h>
-#include "semisync_slave.h"
-#include <mysql.h>
-
-static ReplSemiSyncSlave repl_semisync;
-
-/*
-  indicate whether or not the slave should send a reply to the master.
-
-  This is set to true in repl_semi_slave_read_event if the current
-  event read is the last event of a transaction. And the value is
-  checked in repl_semi_slave_queue_event.
-*/
-bool semi_sync_need_reply= false;
-
-C_MODE_START
-
-int repl_semi_reset_slave(Binlog_relay_IO_param *param)
-{
-  // TODO: reset semi-sync slave status here
-  return 0;
-}
-
-int repl_semi_slave_request_dump(Binlog_relay_IO_param *param,
-				 uint32 flags)
-{
-  MYSQL *mysql= param->mysql;
-  MYSQL_RES *res= 0;
-  MYSQL_ROW row;
-  const char *query;
-
-  if (!repl_semisync.getSlaveEnabled())
-    return 0;
-
-  /* Check if master server has semi-sync plugin installed */
-  query= "SHOW VARIABLES LIKE 'rpl_semi_sync_master_enabled'";
-  if (mysql_real_query(mysql, query, strlen(query)) ||
-      !(res= mysql_store_result(mysql)))
-  {
-    sql_print_error("Execution failed on master: %s", query);
-    return 1;
-  }
-
-  row= mysql_fetch_row(res);
-  if (!row)
-  {
-    /* Master does not support semi-sync */
-    sql_print_warning("Master server does not support semi-sync, "
-                      "fallback to asynchronous replication");
-    rpl_semi_sync_slave_status= 0;
-    mysql_free_result(res);
-    return 0;
-  }
-  mysql_free_result(res);
-
-  /*
-    Tell master dump thread that we want to do semi-sync
-    replication
-  */
-  query= "SET @rpl_semi_sync_slave= 1";
-  if (mysql_real_query(mysql, query, strlen(query)))
-  {
-    sql_print_error("Set 'rpl_semi_sync_slave=1' on master failed");
-    return 1;
-  }
-  mysql_free_result(mysql_store_result(mysql));
-  rpl_semi_sync_slave_status= 1;
-  return 0;
-}
-
-int repl_semi_slave_read_event(Binlog_relay_IO_param *param,
-			       const char *packet, unsigned long len,
-			       const char **event_buf, unsigned long *event_len)
-{
-  if (rpl_semi_sync_slave_status)
-    return repl_semisync.slaveReadSyncHeader(packet, len,
-					     &semi_sync_need_reply,
-					     event_buf, event_len);
-  *event_buf= packet;
-  *event_len= len;
-  return 0;
-}
-
-int repl_semi_slave_queue_event(Binlog_relay_IO_param *param,
-				const char *event_buf,
-				unsigned long event_len,
-				uint32 flags)
-{
-  if (rpl_semi_sync_slave_status && semi_sync_need_reply)
-  {
-    /*
-      We deliberately ignore the error in slaveReply, such error
-      should not cause the slave IO thread to stop, and the error
-      messages are already reported.
-    */
-    (void) repl_semisync.slaveReply(param->mysql,
-                                    param->master_log_name,
-                                    param->master_log_pos);
-  }
-  return 0;
-}
-
-int repl_semi_slave_io_start(Binlog_relay_IO_param *param)
-{
-  return repl_semisync.slaveStart(param);
-}
-
-int repl_semi_slave_io_end(Binlog_relay_IO_param *param)
-{
-  return repl_semisync.slaveStop(param);
-}
-
-C_MODE_END
-
-static void fix_rpl_semi_sync_slave_enabled(MYSQL_THD thd,
-					    SYS_VAR *var,
-					    void *ptr,
-					    const void *val)
-{
-  *(char *)ptr= *(char *)val;
-  repl_semisync.setSlaveEnabled(rpl_semi_sync_slave_enabled != 0);
-  return;
-}
-
-static void fix_rpl_semi_sync_trace_level(MYSQL_THD thd,
-					  SYS_VAR *var,
-					  void *ptr,
-					  const void *val)
-{
-  *(unsigned long *)ptr= *(unsigned long *)val;
-  repl_semisync.setTraceLevel(rpl_semi_sync_slave_trace_level);
-  return;
-}
-
-/* plugin system variables */
-static MYSQL_SYSVAR_BOOL(enabled, rpl_semi_sync_slave_enabled,
-  PLUGIN_VAR_OPCMDARG,
- "Enable semi-synchronous replication slave (disabled by default). ",
-  NULL,				   // check
-  &fix_rpl_semi_sync_slave_enabled, // update
-  0);
-
-static MYSQL_SYSVAR_ULONG(trace_level, rpl_semi_sync_slave_trace_level,
-  PLUGIN_VAR_OPCMDARG,
- "The tracing level for semi-sync replication.",
-  NULL,				  // check
-  &fix_rpl_semi_sync_trace_level, // update
-  32, 0, ~0UL, 1);
-
-static SYS_VAR* semi_sync_slave_system_vars[]= {
-  MYSQL_SYSVAR(enabled),
-  MYSQL_SYSVAR(trace_level),
-  NULL,
-};
-
-
-/* plugin status variables */
-static SHOW_VAR semi_sync_slave_status_vars[]= {
-  {"Rpl_semi_sync_slave_status",
-   (char*) &rpl_semi_sync_slave_status,    SHOW_BOOL},
-  {NULL, NULL, SHOW_BOOL},
-};
-
-Binlog_relay_IO_observer relay_io_observer = {
-  sizeof(Binlog_relay_IO_observer), // len
-
-  repl_semi_slave_io_start,	// start
-  repl_semi_slave_io_end,	// stop
-  repl_semi_slave_request_dump,	// request_transmit
-  repl_semi_slave_read_event,	// after_read_event
-  repl_semi_slave_queue_event,	// after_queue_event
-  repl_semi_reset_slave,	// reset
-};
-
-static int semi_sync_slave_plugin_init(void *p)
-{
-  if (repl_semisync.initObject())
-    return 1;
-  if (register_binlog_relay_io_observer(&relay_io_observer, p))
-    return 1;
-  return 0;
-}
-
-static int semi_sync_slave_plugin_deinit(void *p)
-{
-  if (unregister_binlog_relay_io_observer(&relay_io_observer, p))
-    return 1;
-  return 0;
-}
-
-
-struct Mysql_replication semi_sync_slave_plugin= {
-  MYSQL_REPLICATION_INTERFACE_VERSION
-};
-
-/*
-  Plugin library descriptor
-*/
-maria_declare_plugin(semisync_slave)
-{
-  MYSQL_REPLICATION_PLUGIN,
-  &semi_sync_slave_plugin,
-  "rpl_semi_sync_slave",
-  "He Zhenxing",
-  "Semi-synchronous replication slave",
-  PLUGIN_LICENSE_GPL,
-  semi_sync_slave_plugin_init, /* Plugin Init */
-  semi_sync_slave_plugin_deinit, /* Plugin Deinit */
-  0x0100 /* 1.0 */,
-  semi_sync_slave_status_vars,	/* status variables */
-  semi_sync_slave_system_vars,	/* system variables */
-  "1.0",
-  MariaDB_PLUGIN_MATURITY_STABLE
-}
-maria_declare_plugin_end;
-