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/*
Copyright (c) 2015, Facebook, Inc.
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
/* C++ system header files */
#include <map>
#include <memory>
#include <string>
#include <unordered_set>
#include <vector>
/* RocksDB header files */
#include "rocksdb/db.h"
/* MyRocks header files */
#include "./ha_rocksdb.h"
namespace myrocks {
class Rdb_ddl_manager;
class Rdb_key_def;
extern std::atomic<uint64_t> rocksdb_num_sst_entry_put;
extern std::atomic<uint64_t> rocksdb_num_sst_entry_delete;
extern std::atomic<uint64_t> rocksdb_num_sst_entry_singledelete;
extern std::atomic<uint64_t> rocksdb_num_sst_entry_merge;
extern std::atomic<uint64_t> rocksdb_num_sst_entry_other;
extern my_bool rocksdb_compaction_sequential_deletes_count_sd;
struct Rdb_compact_params {
uint64_t m_deletes, m_window, m_file_size;
};
struct Rdb_index_stats {
enum {
INDEX_STATS_VERSION_INITIAL = 1,
INDEX_STATS_VERSION_ENTRY_TYPES = 2,
};
GL_INDEX_ID m_gl_index_id;
int64_t m_data_size, m_rows, m_actual_disk_size;
int64_t m_entry_deletes, m_entry_single_deletes;
int64_t m_entry_merges, m_entry_others;
std::vector<int64_t> m_distinct_keys_per_prefix;
std::string m_name; // name is not persisted
static std::string materialize(const std::vector<Rdb_index_stats> &stats);
static int unmaterialize(const std::string &s,
std::vector<Rdb_index_stats> *const ret);
Rdb_index_stats() : Rdb_index_stats({0, 0}) {}
explicit Rdb_index_stats(GL_INDEX_ID gl_index_id)
: m_gl_index_id(gl_index_id),
m_data_size(0),
m_rows(0),
m_actual_disk_size(0),
m_entry_deletes(0),
m_entry_single_deletes(0),
m_entry_merges(0),
m_entry_others(0) {}
void merge(const Rdb_index_stats &s, const bool increment = true,
const int64_t estimated_data_len = 0);
};
// The helper class to calculate index cardinality
class Rdb_tbl_card_coll {
public:
explicit Rdb_tbl_card_coll(const uint8_t table_stats_sampling_pct);
public:
void ProcessKey(const rocksdb::Slice &key, const Rdb_key_def *keydef,
Rdb_index_stats *stats);
/*
* Resets the state of the collector to start calculating statistics for a
* next index.
*/
void Reset();
/*
* Cardinality statistics might be calculated using some sampling strategy.
* This method adjusts gathered statistics according to the sampling
* strategy used. Note that adjusted cardinality value is just an estimate
* and can return a value exeeding number of rows in a table, so the
* returned value should be capped by row count before using it by
* an optrimizer or displaying it to a clent.
*/
void AdjustStats(Rdb_index_stats *stats);
private:
bool ShouldCollectStats();
bool IsSampingDisabled();
private:
std::string m_last_key;
uint8_t m_table_stats_sampling_pct;
unsigned int m_seed;
};
class Rdb_tbl_prop_coll : public rocksdb::TablePropertiesCollector {
public:
Rdb_tbl_prop_coll(Rdb_ddl_manager *const ddl_manager,
const Rdb_compact_params ¶ms, const uint32_t cf_id,
const uint8_t table_stats_sampling_pct);
/*
Override parent class's virtual methods of interest.
*/
virtual rocksdb::Status AddUserKey(const rocksdb::Slice &key,
const rocksdb::Slice &value,
rocksdb::EntryType type,
rocksdb::SequenceNumber seq,
uint64_t file_size) override;
virtual rocksdb::Status Finish(
rocksdb::UserCollectedProperties *properties) override;
virtual const char *Name() const override { return "Rdb_tbl_prop_coll"; }
rocksdb::UserCollectedProperties GetReadableProperties() const override;
bool NeedCompact() const override;
public:
uint64_t GetMaxDeletedRows() const { return m_max_deleted_rows; }
static void read_stats_from_tbl_props(
const std::shared_ptr<const rocksdb::TableProperties> &table_props,
std::vector<Rdb_index_stats> *out_stats_vector);
private:
static std::string GetReadableStats(const Rdb_index_stats &it);
bool ShouldCollectStats();
void CollectStatsForRow(const rocksdb::Slice &key,
const rocksdb::Slice &value,
const rocksdb::EntryType &type,
const uint64_t file_size);
Rdb_index_stats *AccessStats(const rocksdb::Slice &key);
void AdjustDeletedRows(rocksdb::EntryType type);
private:
uint32_t m_cf_id;
std::shared_ptr<const Rdb_key_def> m_keydef;
Rdb_ddl_manager *m_ddl_manager;
std::vector<Rdb_index_stats> m_stats;
Rdb_index_stats *m_last_stats;
static const char *INDEXSTATS_KEY;
// last added key
std::string m_last_key;
// floating window to count deleted rows
std::vector<bool> m_deleted_rows_window;
uint64_t m_rows, m_window_pos, m_deleted_rows, m_max_deleted_rows;
uint64_t m_file_size;
Rdb_compact_params m_params;
Rdb_tbl_card_coll m_cardinality_collector;
bool m_recorded;
};
class Rdb_tbl_prop_coll_factory
: public rocksdb::TablePropertiesCollectorFactory {
public:
Rdb_tbl_prop_coll_factory(const Rdb_tbl_prop_coll_factory &) = delete;
Rdb_tbl_prop_coll_factory &operator=(const Rdb_tbl_prop_coll_factory &) =
delete;
explicit Rdb_tbl_prop_coll_factory(Rdb_ddl_manager *ddl_manager)
: m_ddl_manager(ddl_manager) {}
/*
Override parent class's virtual methods of interest.
*/
virtual rocksdb::TablePropertiesCollector *CreateTablePropertiesCollector(
rocksdb::TablePropertiesCollectorFactory::Context context) override {
return new Rdb_tbl_prop_coll(m_ddl_manager, m_params,
context.column_family_id,
m_table_stats_sampling_pct);
}
virtual const char *Name() const override {
return "Rdb_tbl_prop_coll_factory";
}
public:
void SetCompactionParams(const Rdb_compact_params ¶ms) {
m_params = params;
}
void SetTableStatsSamplingPct(const uint8_t table_stats_sampling_pct) {
m_table_stats_sampling_pct = table_stats_sampling_pct;
}
private:
Rdb_ddl_manager *const m_ddl_manager;
Rdb_compact_params m_params;
uint8_t m_table_stats_sampling_pct;
};
} // namespace myrocks
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