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/*
Portions Copyright (c) 2016-Present, Facebook, Inc.
Portions Copyright (c) 2012, Monty Program 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 Street, Fifth Floor, Boston, MA 02111-1301 USA */
#pragma once
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
/* C++ system header files */
#include <time.h>
#include <string>
#include <ctime>
/* RocksDB includes */
#include "rocksdb/compaction_filter.h"
/* MyRocks includes */
#include "./ha_rocksdb_proto.h"
#include "./rdb_datadic.h"
namespace myrocks {
class Rdb_compact_filter : public rocksdb::CompactionFilter {
public:
Rdb_compact_filter(const Rdb_compact_filter &) = delete;
Rdb_compact_filter &operator=(const Rdb_compact_filter &) = delete;
explicit Rdb_compact_filter(uint32_t _cf_id) : m_cf_id(_cf_id) {}
~Rdb_compact_filter() {
// Increment stats by num expired at the end of compaction
rdb_update_global_stats(ROWS_EXPIRED, m_num_expired);
}
// keys are passed in sorted order within the same sst.
// V1 Filter is thread safe on our usage (creating from Factory).
// Make sure to protect instance variables when switching to thread
// unsafe in the future.
virtual bool Filter(int level, const rocksdb::Slice &key,
const rocksdb::Slice &existing_value,
std::string *new_value,
bool *value_changed) const override {
DBUG_ASSERT(key.size() >= sizeof(uint32));
GL_INDEX_ID gl_index_id;
gl_index_id.cf_id = m_cf_id;
gl_index_id.index_id = rdb_netbuf_to_uint32((const uchar *)key.data());
DBUG_ASSERT(gl_index_id.index_id >= 1);
if (gl_index_id != m_prev_index) {
m_should_delete =
rdb_get_dict_manager()->is_drop_index_ongoing(gl_index_id);
if (!m_should_delete) {
get_ttl_duration_and_offset(gl_index_id, &m_ttl_duration,
&m_ttl_offset);
if (m_ttl_duration != 0 && m_snapshot_timestamp == 0) {
/*
For efficiency reasons, we lazily call GetIntProperty to get the
oldest snapshot time (occurs once per compaction).
*/
rocksdb::DB *const rdb = rdb_get_rocksdb_db();
if (!rdb->GetIntProperty(rocksdb::DB::Properties::kOldestSnapshotTime,
&m_snapshot_timestamp) ||
m_snapshot_timestamp == 0) {
m_snapshot_timestamp = static_cast<uint64_t>(std::time(nullptr));
}
#ifndef DBUG_OFF
int snapshot_ts = rdb_dbug_set_ttl_snapshot_ts();
if (snapshot_ts) {
m_snapshot_timestamp =
static_cast<uint64_t>(std::time(nullptr)) + snapshot_ts;
}
#endif
}
}
m_prev_index = gl_index_id;
}
if (m_should_delete) {
m_num_deleted++;
return true;
} else if (m_ttl_duration > 0 &&
should_filter_ttl_rec(key, existing_value)) {
m_num_expired++;
return true;
}
return false;
}
virtual bool IgnoreSnapshots() const override { return true; }
virtual const char *Name() const override { return "Rdb_compact_filter"; }
void get_ttl_duration_and_offset(const GL_INDEX_ID &gl_index_id,
uint64 *ttl_duration,
uint32 *ttl_offset) const {
DBUG_ASSERT(ttl_duration != nullptr);
/*
If TTL is disabled set ttl_duration to 0. This prevents the compaction
filter from dropping expired records.
*/
if (!rdb_is_ttl_enabled()) {
*ttl_duration = 0;
return;
}
/*
If key is part of system column family, it's definitely not a TTL key.
*/
rocksdb::ColumnFamilyHandle *s_cf = rdb_get_dict_manager()->get_system_cf();
if (s_cf == nullptr || gl_index_id.cf_id == s_cf->GetID()) {
*ttl_duration = 0;
return;
}
struct Rdb_index_info index_info;
if (!rdb_get_dict_manager()->get_index_info(gl_index_id, &index_info)) {
// NO_LINT_DEBUG
sql_print_error(
"RocksDB: Could not get index information "
"for Index Number (%u,%u)",
gl_index_id.cf_id, gl_index_id.index_id);
}
#ifndef DBUG_OFF
if (rdb_dbug_set_ttl_ignore_pk() &&
index_info.m_index_type == Rdb_key_def::INDEX_TYPE_PRIMARY) {
*ttl_duration = 0;
return;
}
#endif
*ttl_duration = index_info.m_ttl_duration;
if (Rdb_key_def::has_index_flag(index_info.m_index_flags,
Rdb_key_def::TTL_FLAG)) {
*ttl_offset = Rdb_key_def::calculate_index_flag_offset(
index_info.m_index_flags, Rdb_key_def::TTL_FLAG);
}
}
bool should_filter_ttl_rec(const rocksdb::Slice &key,
const rocksdb::Slice &existing_value) const {
uint64 ttl_timestamp;
Rdb_string_reader reader(&existing_value);
if (!reader.read(m_ttl_offset) || reader.read_uint64(&ttl_timestamp)) {
std::string buf;
buf = rdb_hexdump(existing_value.data(), existing_value.size(),
RDB_MAX_HEXDUMP_LEN);
// NO_LINT_DEBUG
sql_print_error(
"Decoding ttl from PK value failed in compaction filter, "
"for index (%u,%u), val: %s",
m_prev_index.cf_id, m_prev_index.index_id, buf.c_str());
abort();
}
/*
Filter out the record only if it is older than the oldest snapshot
timestamp. This prevents any rows from expiring in the middle of
long-running transactions.
*/
return ttl_timestamp + m_ttl_duration <= m_snapshot_timestamp;
}
private:
// Column family for this compaction filter
const uint32_t m_cf_id;
// Index id of the previous record
mutable GL_INDEX_ID m_prev_index = {0, 0};
// Number of rows deleted for the same index id
mutable uint64 m_num_deleted = 0;
// Number of rows expired for the TTL index
mutable uint64 m_num_expired = 0;
// Current index id should be deleted or not (should be deleted if true)
mutable bool m_should_delete = false;
// TTL duration for the current index if TTL is enabled
mutable uint64 m_ttl_duration = 0;
// TTL offset for all records in the current index
mutable uint32 m_ttl_offset = 0;
// Oldest snapshot timestamp at the time a TTL index is discovered
mutable uint64_t m_snapshot_timestamp = 0;
};
class Rdb_compact_filter_factory : public rocksdb::CompactionFilterFactory {
public:
Rdb_compact_filter_factory(const Rdb_compact_filter_factory &) = delete;
Rdb_compact_filter_factory &operator=(const Rdb_compact_filter_factory &) =
delete;
Rdb_compact_filter_factory() = default;
~Rdb_compact_filter_factory() = default;
const char *Name() const override { return "Rdb_compact_filter_factory"; }
std::unique_ptr<rocksdb::CompactionFilter> CreateCompactionFilter(
const rocksdb::CompactionFilter::Context &context) override {
return std::unique_ptr<rocksdb::CompactionFilter>(
new Rdb_compact_filter(context.column_family_id));
}
};
} // namespace myrocks
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