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Diffstat (limited to 'plugin/semisync/semisync_master_plugin.cc')
| -rw-r--r-- | plugin/semisync/semisync_master_plugin.cc | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/plugin/semisync/semisync_master_plugin.cc b/plugin/semisync/semisync_master_plugin.cc new file mode 100644 index 00000000000..efcb7172b28 --- /dev/null +++ b/plugin/semisync/semisync_master_plugin.cc @@ -0,0 +1,394 @@ +/* Copyright (C) 2007 Google Inc. + Copyright (C) 2008 MySQL AB + + 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 "semisync_master.h" + +ReplSemiSyncMaster repl_semisync; + +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_commit(Trans_param *param) +{ + + 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; +} + +/* + 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); + +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, ~0L, 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, ~0L, 1); + +static SYS_VAR* semi_sync_master_system_vars[]= { + MYSQL_SYSVAR(enabled), + 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 +}; + +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_FUNC}, + {"Rpl_semi_sync_master_clients", + (char*) &SHOW_FNAME(clients), + SHOW_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_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_FUNC}, + {"Rpl_semi_sync_master_tx_waits", + (char*) &SHOW_FNAME(trx_wait_num), + SHOW_FUNC}, + {"Rpl_semi_sync_master_tx_avg_wait_time", + (char*) &SHOW_FNAME(avg_trx_wait_time), + SHOW_FUNC}, + {"Rpl_semi_sync_master_net_wait_time", + (char*) &SHOW_FNAME(net_wait_time), + SHOW_FUNC}, + {"Rpl_semi_sync_master_net_waits", + (char*) &SHOW_FNAME(net_wait_num), + SHOW_FUNC}, + {"Rpl_semi_sync_master_net_avg_wait_time", + (char*) &SHOW_FNAME(avg_net_wait_time), + SHOW_FUNC}, + {NULL, NULL, SHOW_LONG}, +}; + + +static int semi_sync_master_plugin_init(void *p) +{ + 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; + } + sql_print_information("unregister_replicator OK"); + return 0; +} + +struct Mysql_replication semi_sync_master_plugin= { + MYSQL_REPLICATION_INTERFACE_VERSION +}; + +/* + Plugin library descriptor +*/ +mysql_declare_plugin(semi_sync_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 */ + NULL /* config options */ +} +mysql_declare_plugin_end; 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