//  This source code is licensed under both the GPLv2 (found in the

//  COPYING file in the root directory) and Apache 2.0 License

//  (found in the LICENSE.Apache file in the root directory).

//

// Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.

//

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file. See the AUTHORS file for names of contributors.

#include "db/internal_stats.h"

#include <algorithm>

#include <cinttypes>

#include <cstddef>

#include <limits>

#include <sstream>

#include <string>

#include <unordered_map>

#include <utility>

#include <vector>

#include "cache/cache_entry_roles.h"

#include "cache/cache_entry_stats.h"

#include "db/column_family.h"

#include "db/db_impl/db_impl.h"

#include "db/write_stall_stats.h"

#include "port/port.h"

#include "rocksdb/system_clock.h"

#include "rocksdb/table.h"

#include "table/block_based/cachable_entry.h"

#include "util/hash_containers.h"

#include "util/string_util.h"

namespace ROCKSDB_NAMESPACE {

const std::map<LevelStatType, LevelStat> InternalStats::compaction_level_stats =

    {

        {LevelStatType::NUM_FILES, LevelStat{"NumFiles", "Files"}},

        {LevelStatType::COMPACTED_FILES,

         LevelStat{"CompactedFiles", "CompactedFiles"}},

        {LevelStatType::SIZE_BYTES, LevelStat{"SizeBytes", "Size"}},

        {LevelStatType::SCORE, LevelStat{"Score", "Score"}},

        {LevelStatType::READ_GB, LevelStat{"ReadGB", "Read(GB)"}},

        {LevelStatType::RN_GB, LevelStat{"RnGB", "Rn(GB)"}},

        {LevelStatType::RNP1_GB, LevelStat{"Rnp1GB", "Rnp1(GB)"}},

        {LevelStatType::WRITE_GB, LevelStat{"WriteGB", "Write(GB)"}},

        {LevelStatType::WRITE_PRE_COMP_GB,

         LevelStat{"WPreCompGB", "WPreComp(GB)"}},

        {LevelStatType::W_NEW_GB, LevelStat{"WnewGB", "Wnew(GB)"}},

        {LevelStatType::MOVED_GB, LevelStat{"MovedGB", "Moved(GB)"}},

        {LevelStatType::WRITE_AMP, LevelStat{"WriteAmp", "W-Amp"}},

        {LevelStatType::READ_MBPS, LevelStat{"ReadMBps", "Rd(MB/s)"}},

        {LevelStatType::WRITE_MBPS, LevelStat{"WriteMBps", "Wr(MB/s)"}},

        {LevelStatType::COMP_SEC, LevelStat{"CompSec", "Comp(sec)"}},

        {LevelStatType::COMP_CPU_SEC,

         LevelStat{"CompMergeCPU", "CompMergeCPU(sec)"}},

        {LevelStatType::COMP_COUNT, LevelStat{"CompCount", "Comp(cnt)"}},

        {LevelStatType::AVG_SEC, LevelStat{"AvgSec", "Avg(sec)"}},

        {LevelStatType::KEY_IN, LevelStat{"KeyIn", "KeyIn"}},

        {LevelStatType::KEY_DROP, LevelStat{"KeyDrop", "KeyDrop"}},

        {LevelStatType::R_BLOB_GB, LevelStat{"RblobGB", "Rblob(GB)"}},

        {LevelStatType::W_BLOB_GB, LevelStat{"WblobGB", "Wblob(GB)"}},

};

const std::map<InternalStats::InternalDBStatsType, DBStatInfo>

    InternalStats::db_stats_type_to_info = {

        {InternalStats::kIntStatsWalFileBytes,

         DBStatInfo{"db.wal_bytes_written"}},

        {InternalStats::kIntStatsWalFileSynced, DBStatInfo{"db.wal_syncs"}},

        {InternalStats::kIntStatsBytesWritten,

         DBStatInfo{"db.user_bytes_written"}},

        {InternalStats::kIntStatsNumKeysWritten,

         DBStatInfo{"db.user_keys_written"}},

        {InternalStats::kIntStatsWriteDoneByOther,

         DBStatInfo{"db.user_writes_by_other"}},

        {InternalStats::kIntStatsWriteDoneBySelf,

         DBStatInfo{"db.user_writes_by_self"}},

        {InternalStats::kIntStatsWriteWithWal,

         DBStatInfo{"db.user_writes_with_wal"}},

        {InternalStats::kIntStatsWriteStallMicros,

         DBStatInfo{"db.user_write_stall_micros"}},

        {InternalStats::kIntStatsWriteBufferManagerLimitStopsCounts,

         DBStatInfo{WriteStallStatsMapKeys::CauseConditionCount(

             WriteStallCause::kWriteBufferManagerLimit,

             WriteStallCondition::kStopped)}},

};

namespace {

const double kMB = 1048576.0;

const double kGB = kMB * 1024;

const double kMicrosInSec = 1000000.0;

void PrintLevelStatsHeader(char* buf, size_t len, const std::string& cf_name,

                           const std::string& group_by) {

  int written_size =

      snprintf(buf, len, "\n** Compaction Stats [%s] **\n", cf_name.c_str());

  written_size = std::min(written_size, static_cast<int>(len));

  auto hdr = [](LevelStatType t) {

    return InternalStats::compaction_level_stats.at(t).header_name.c_str();

  };

  int line_size = snprintf(

      buf + written_size, len - written_size,

      "%s    %s   %s     %s %s  %s %s %s %s %s %s %s %s %s %s %s %s %s %s %s "

      "%s "

      "%s\n",

      // Note that we skip COMPACTED_FILES and merge it with Files column

      group_by.c_str(), hdr(LevelStatType::NUM_FILES),

      hdr(LevelStatType::SIZE_BYTES), hdr(LevelStatType::SCORE),

      hdr(LevelStatType::READ_GB), hdr(LevelStatType::RN_GB),

      hdr(LevelStatType::RNP1_GB), hdr(LevelStatType::WRITE_GB),

      hdr(LevelStatType::WRITE_PRE_COMP_GB), hdr(LevelStatType::W_NEW_GB),

      hdr(LevelStatType::MOVED_GB), hdr(LevelStatType::WRITE_AMP),

      hdr(LevelStatType::READ_MBPS), hdr(LevelStatType::WRITE_MBPS),

      hdr(LevelStatType::COMP_SEC), hdr(LevelStatType::COMP_CPU_SEC),

      hdr(LevelStatType::COMP_COUNT), hdr(LevelStatType::AVG_SEC),

      hdr(LevelStatType::KEY_IN), hdr(LevelStatType::KEY_DROP),

      hdr(LevelStatType::R_BLOB_GB), hdr(LevelStatType::W_BLOB_GB));

  written_size += line_size;

  written_size = std::min(written_size, static_cast<int>(len));

  snprintf(buf + written_size, len - written_size, "%s\n",

           std::string(line_size, '-').c_str());

}

void PrepareLevelStats(std::map<LevelStatType, double>* level_stats,

                       int num_files, int being_compacted,

                       double total_file_size, double score, double w_amp,

                       const InternalStats::CompactionStats& stats) {

  const uint64_t bytes_read = stats.bytes_read_non_output_levels +

                              stats.bytes_read_output_level +

                              stats.bytes_read_blob;

  const uint64_t bytes_written = stats.bytes_written + stats.bytes_written_blob;

  const int64_t bytes_new = stats.bytes_written - stats.bytes_read_output_level;

  const double elapsed = (stats.micros + 1) / kMicrosInSec;

  (*level_stats)[LevelStatType::NUM_FILES] = num_files;

  (*level_stats)[LevelStatType::COMPACTED_FILES] = being_compacted;

  (*level_stats)[LevelStatType::SIZE_BYTES] = total_file_size;

  (*level_stats)[LevelStatType::SCORE] = score;

  (*level_stats)[LevelStatType::READ_GB] = bytes_read / kGB;

  (*level_stats)[LevelStatType::RN_GB] =

      stats.bytes_read_non_output_levels / kGB;

  (*level_stats)[LevelStatType::RNP1_GB] = stats.bytes_read_output_level / kGB;

  (*level_stats)[LevelStatType::WRITE_GB] = stats.bytes_written / kGB;

  (*level_stats)[LevelStatType::WRITE_PRE_COMP_GB] =

      stats.bytes_written_pre_comp / kGB;

  (*level_stats)[LevelStatType::W_NEW_GB] = bytes_new / kGB;

  (*level_stats)[LevelStatType::MOVED_GB] = stats.bytes_moved / kGB;

  (*level_stats)[LevelStatType::WRITE_AMP] = w_amp;

  (*level_stats)[LevelStatType::READ_MBPS] = bytes_read / kMB / elapsed;

  (*level_stats)[LevelStatType::WRITE_MBPS] = bytes_written / kMB / elapsed;

  (*level_stats)[LevelStatType::COMP_SEC] = stats.micros / kMicrosInSec;

  (*level_stats)[LevelStatType::COMP_CPU_SEC] = stats.cpu_micros / kMicrosInSec;

  (*level_stats)[LevelStatType::COMP_COUNT] = stats.count;

  (*level_stats)[LevelStatType::AVG_SEC] =

      stats.count == 0 ? 0 : stats.micros / kMicrosInSec / stats.count;

  (*level_stats)[LevelStatType::KEY_IN] =

      static_cast<double>(stats.num_input_records);

  (*level_stats)[LevelStatType::KEY_DROP] =

      static_cast<double>(stats.num_dropped_records);

  (*level_stats)[LevelStatType::R_BLOB_GB] = stats.bytes_read_blob / kGB;

  (*level_stats)[LevelStatType::W_BLOB_GB] = stats.bytes_written_blob / kGB;

}

void PrintLevelStats(char* buf, size_t len, const std::string& name,

                     const std::map<LevelStatType, double>& stat_value) {

  snprintf(

      buf, len,

      "%4s "      /*  Level */

      "%6d/%-3d " /*  Files */

      "%10s "     /*  Size */

      "%5.1f "    /*  Score */

      "%8.1f "    /*  Read(GB) */

      "%7.1f "    /*  Rn(GB) */

      "%8.1f "    /*  Rnp1(GB) */

      "%9.1f "    /*  Write(GB) */

      "%9.1f "    /*  WPreComp(GB) */

      "%8.1f "    /*  Wnew(GB) */

      "%9.1f "    /*  Moved(GB) */

      "%5.1f "    /*  W-Amp */

      "%8.1f "    /*  Rd(MB/s) */

      "%8.1f "    /*  Wr(MB/s) */

      "%9.2f "    /*  Comp(sec) */

      "%17.2f "   /*  CompMergeCPU(sec) */

      "%9d "      /*  Comp(cnt) */

      "%8.3f "    /*  Avg(sec) */

      "%7s "      /*  KeyIn */

      "%6s "      /*  KeyDrop */

      "%9.1f "    /*  Rblob(GB) */

      "%9.1f\n",  /*  Wblob(GB) */

      name.c_str(), static_cast<int>(stat_value.at(LevelStatType::NUM_FILES)),

      static_cast<int>(stat_value.at(LevelStatType::COMPACTED_FILES)),

      BytesToHumanString(

          static_cast<uint64_t>(stat_value.at(LevelStatType::SIZE_BYTES)))

          .c_str(),

      stat_value.at(LevelStatType::SCORE),

      stat_value.at(LevelStatType::READ_GB),

      stat_value.at(LevelStatType::RN_GB),

      stat_value.at(LevelStatType::RNP1_GB),

      stat_value.at(LevelStatType::WRITE_GB),

      stat_value.at(LevelStatType::WRITE_PRE_COMP_GB),

      stat_value.at(LevelStatType::W_NEW_GB),

      stat_value.at(LevelStatType::MOVED_GB),

      stat_value.at(LevelStatType::WRITE_AMP),

      stat_value.at(LevelStatType::READ_MBPS),

      stat_value.at(LevelStatType::WRITE_MBPS),

      stat_value.at(LevelStatType::COMP_SEC),

      stat_value.at(LevelStatType::COMP_CPU_SEC),

      static_cast<int>(stat_value.at(LevelStatType::COMP_COUNT)),

      stat_value.at(LevelStatType::AVG_SEC),

      NumberToHumanString(

          static_cast<std::int64_t>(stat_value.at(LevelStatType::KEY_IN)))

          .c_str(),

      NumberToHumanString(

          static_cast<std::int64_t>(stat_value.at(LevelStatType::KEY_DROP)))

          .c_str(),

      stat_value.at(LevelStatType::R_BLOB_GB),

      stat_value.at(LevelStatType::W_BLOB_GB));

}

void PrintLevelStats(char* buf, size_t len, const std::string& name,

                     int num_files, int being_compacted, double total_file_size,

                     double score, double w_amp,

                     const InternalStats::CompactionStats& stats) {

  std::map<LevelStatType, double> level_stats;

  PrepareLevelStats(&level_stats, num_files, being_compacted, total_file_size,

                    score, w_amp, stats);

  PrintLevelStats(buf, len, name, level_stats);

}

// Assumes that trailing numbers represent an optional argument. This requires

// property names to not end with numbers.

std::pair<Slice, Slice> GetPropertyNameAndArg(const Slice& property) {

  Slice name = property;

  Slice arg = property;

  size_t sfx_len = 0;

  while (sfx_len < property.size() &&

         isdigit(property[property.size() - sfx_len - 1])) {

    ++sfx_len;

  }

  name.remove_suffix(sfx_len);

  arg.remove_prefix(property.size() - sfx_len);

  return {name, arg};

}

}  // anonymous namespace

static const std::string rocksdb_prefix = "rocksdb.";

static const std::string num_files_at_level_prefix = "num-files-at-level";

static const std::string compression_ratio_at_level_prefix =

    "compression-ratio-at-level";

static const std::string allstats = "stats";

static const std::string sstables = "sstables";

static const std::string cfstats = "cfstats";

static const std::string cfstats_no_file_histogram =

    "cfstats-no-file-histogram";

static const std::string cf_file_histogram = "cf-file-histogram";

static const std::string cf_write_stall_stats = "cf-write-stall-stats";

static const std::string dbstats = "dbstats";

static const std::string db_write_stall_stats = "db-write-stall-stats";

static const std::string levelstats = "levelstats";

static const std::string block_cache_entry_stats = "block-cache-entry-stats";

static const std::string fast_block_cache_entry_stats =

    "fast-block-cache-entry-stats";

static const std::string num_immutable_mem_table = "num-immutable-mem-table";

static const std::string num_immutable_mem_table_flushed =

    "num-immutable-mem-table-flushed";

static const std::string mem_table_flush_pending = "mem-table-flush-pending";

static const std::string compaction_pending = "compaction-pending";

static const std::string background_errors = "background-errors";

static const std::string cur_size_active_mem_table =

    "cur-size-active-mem-table";

static const std::string cur_size_all_mem_tables = "cur-size-all-mem-tables";

static const std::string size_all_mem_tables = "size-all-mem-tables";

static const std::string num_entries_active_mem_table =

    "num-entries-active-mem-table";

static const std::string num_entries_imm_mem_tables =

    "num-entries-imm-mem-tables";

static const std::string num_deletes_active_mem_table =

    "num-deletes-active-mem-table";

static const std::string num_deletes_imm_mem_tables =

    "num-deletes-imm-mem-tables";

static const std::string estimate_num_keys = "estimate-num-keys";

static const std::string estimate_table_readers_mem =

    "estimate-table-readers-mem";

static const std::string is_file_deletions_enabled =

    "is-file-deletions-enabled";

static const std::string num_snapshots = "num-snapshots";

static const std::string oldest_snapshot_time = "oldest-snapshot-time";

static const std::string oldest_snapshot_sequence = "oldest-snapshot-sequence";

static const std::string num_live_versions = "num-live-versions";

static const std::string current_version_number =

    "current-super-version-number";

static const std::string estimate_live_data_size = "estimate-live-data-size";

static const std::string min_log_number_to_keep_str = "min-log-number-to-keep";

static const std::string min_obsolete_sst_number_to_keep_str =

    "min-obsolete-sst-number-to-keep";

static const std::string base_level_str = "base-level";

static const std::string total_sst_files_size = "total-sst-files-size";

static const std::string live_sst_files_size = "live-sst-files-size";

static const std::string obsolete_sst_files_size = "obsolete-sst-files-size";

static const std::string live_sst_files_size_at_temperature =

    "live-sst-files-size-at-temperature";

static const std::string estimate_pending_comp_bytes =

    "estimate-pending-compaction-bytes";

static const std::string aggregated_table_properties =

    "aggregated-table-properties";

static const std::string aggregated_table_properties_at_level =

    aggregated_table_properties + "-at-level";

static const std::string num_running_compactions = "num-running-compactions";

static const std::string num_running_remote_compactions =

    "num-running-remote-compactions";

static const std::string num_remote_compaction_pool_threads =

    "num-remote-compaction-pool-threads";

static const std::string num_running_bottom_compactions =

    "num-running-bottom-compactions";

static const std::string num_running_compaction_sorted_runs =

    "num-running-compaction-sorted-runs";

static const std::string compaction_abort_count = "compaction-abort-count";

static const std::string num_unscheduled_compactions =

    "num-unscheduled-compactions";

static const std::string num_running_flushes = "num-running-flushes";

static const std::string actual_delayed_write_rate =

    "actual-delayed-write-rate";

static const std::string is_write_stopped = "is-write-stopped";

static const std::string estimate_oldest_key_time = "estimate-oldest-key-time";

static const std::string block_cache_capacity = "block-cache-capacity";

static const std::string block_cache_usage = "block-cache-usage";

static const std::string block_cache_pinned_usage = "block-cache-pinned-usage";

static const std::string options_statistics = "options-statistics";

static const std::string num_blob_files = "num-blob-files";

static const std::string blob_stats = "blob-stats";

static const std::string total_blob_file_size = "total-blob-file-size";

static const std::string live_blob_file_size = "live-blob-file-size";

static const std::string live_blob_file_garbage_size =

    "live-blob-file-garbage-size";

static const std::string blob_cache_capacity = "blob-cache-capacity";

static const std::string blob_cache_usage = "blob-cache-usage";

static const std::string blob_cache_pinned_usage = "blob-cache-pinned-usage";

const std::string DB::Properties::kNumFilesAtLevelPrefix =

    rocksdb_prefix + num_files_at_level_prefix;

const std::string DB::Properties::kCompressionRatioAtLevelPrefix =

    rocksdb_prefix + compression_ratio_at_level_prefix;

const std::string DB::Properties::kStats = rocksdb_prefix + allstats;

const std::string DB::Properties::kSSTables = rocksdb_prefix + sstables;

const std::string DB::Properties::kCFStats = rocksdb_prefix + cfstats;

const std::string DB::Properties::kCFStatsNoFileHistogram =

    rocksdb_prefix + cfstats_no_file_histogram;

const std::string DB::Properties::kCFFileHistogram =

    rocksdb_prefix + cf_file_histogram;

const std::string DB::Properties::kCFWriteStallStats =

    rocksdb_prefix + cf_write_stall_stats;

const std::string DB::Properties::kDBWriteStallStats =

    rocksdb_prefix + db_write_stall_stats;

const std::string DB::Properties::kDBStats = rocksdb_prefix + dbstats;

const std::string DB::Properties::kLevelStats = rocksdb_prefix + levelstats;

const std::string DB::Properties::kBlockCacheEntryStats =

    rocksdb_prefix + block_cache_entry_stats;

const std::string DB::Properties::kFastBlockCacheEntryStats =

    rocksdb_prefix + fast_block_cache_entry_stats;

const std::string DB::Properties::kNumImmutableMemTable =

    rocksdb_prefix + num_immutable_mem_table;

const std::string DB::Properties::kNumImmutableMemTableFlushed =

    rocksdb_prefix + num_immutable_mem_table_flushed;

const std::string DB::Properties::kMemTableFlushPending =

    rocksdb_prefix + mem_table_flush_pending;

const std::string DB::Properties::kCompactionPending =

    rocksdb_prefix + compaction_pending;

const std::string DB::Properties::kNumRunningCompactions =

    rocksdb_prefix + num_running_compactions;

const std::string DB::Properties::kNumRunningRemoteCompactions =

    rocksdb_prefix + num_running_remote_compactions;

const std::string DB::Properties::kNumRemoteCompactionPoolThreads =

    rocksdb_prefix + num_remote_compaction_pool_threads;

const std::string DB::Properties::kNumRunningBottomCompactions =

    rocksdb_prefix + num_running_bottom_compactions;

const std::string DB::Properties::kNumRunningCompactionSortedRuns =

    rocksdb_prefix + num_running_compaction_sorted_runs;

const std::string DB::Properties::kCompactionAbortCount =

    rocksdb_prefix + compaction_abort_count;

const std::string DB::Properties::kNumUnscheduledCompactions =

    rocksdb_prefix + num_unscheduled_compactions;

const std::string DB::Properties::kNumRunningFlushes =

    rocksdb_prefix + num_running_flushes;

const std::string DB::Properties::kBackgroundErrors =

    rocksdb_prefix + background_errors;

const std::string DB::Properties::kCurSizeActiveMemTable =

    rocksdb_prefix + cur_size_active_mem_table;

const std::string DB::Properties::kCurSizeAllMemTables =

    rocksdb_prefix + cur_size_all_mem_tables;

const std::string DB::Properties::kSizeAllMemTables =

    rocksdb_prefix + size_all_mem_tables;

const std::string DB::Properties::kNumEntriesActiveMemTable =

    rocksdb_prefix + num_entries_active_mem_table;

const std::string DB::Properties::kNumEntriesImmMemTables =

    rocksdb_prefix + num_entries_imm_mem_tables;

const std::string DB::Properties::kNumDeletesActiveMemTable =

    rocksdb_prefix + num_deletes_active_mem_table;

const std::string DB::Properties::kNumDeletesImmMemTables =

    rocksdb_prefix + num_deletes_imm_mem_tables;

const std::string DB::Properties::kEstimateNumKeys =

    rocksdb_prefix + estimate_num_keys;

const std::string DB::Properties::kEstimateTableReadersMem =

    rocksdb_prefix + estimate_table_readers_mem;

const std::string DB::Properties::kIsFileDeletionsEnabled =

    rocksdb_prefix + is_file_deletions_enabled;

const std::string DB::Properties::kNumSnapshots =

    rocksdb_prefix + num_snapshots;

const std::string DB::Properties::kOldestSnapshotTime =

    rocksdb_prefix + oldest_snapshot_time;

const std::string DB::Properties::kOldestSnapshotSequence =

    rocksdb_prefix + oldest_snapshot_sequence;

const std::string DB::Properties::kNumLiveVersions =

    rocksdb_prefix + num_live_versions;

const std::string DB::Properties::kCurrentSuperVersionNumber =

    rocksdb_prefix + current_version_number;

const std::string DB::Properties::kEstimateLiveDataSize =

    rocksdb_prefix + estimate_live_data_size;

const std::string DB::Properties::kMinLogNumberToKeep =

    rocksdb_prefix + min_log_number_to_keep_str;

const std::string DB::Properties::kMinObsoleteSstNumberToKeep =

    rocksdb_prefix + min_obsolete_sst_number_to_keep_str;

const std::string DB::Properties::kTotalSstFilesSize =

    rocksdb_prefix + total_sst_files_size;

const std::string DB::Properties::kLiveSstFilesSize =

    rocksdb_prefix + live_sst_files_size;

const std::string DB::Properties::kObsoleteSstFilesSize =

    rocksdb_prefix + obsolete_sst_files_size;

const std::string DB::Properties::kBaseLevel = rocksdb_prefix + base_level_str;

const std::string DB::Properties::kEstimatePendingCompactionBytes =

    rocksdb_prefix + estimate_pending_comp_bytes;

const std::string DB::Properties::kAggregatedTableProperties =

    rocksdb_prefix + aggregated_table_properties;

const std::string DB::Properties::kAggregatedTablePropertiesAtLevel =

    rocksdb_prefix + aggregated_table_properties_at_level;

const std::string DB::Properties::kActualDelayedWriteRate =

    rocksdb_prefix + actual_delayed_write_rate;

const std::string DB::Properties::kIsWriteStopped =

    rocksdb_prefix + is_write_stopped;

const std::string DB::Properties::kEstimateOldestKeyTime =

    rocksdb_prefix + estimate_oldest_key_time;

const std::string DB::Properties::kBlockCacheCapacity =

    rocksdb_prefix + block_cache_capacity;

const std::string DB::Properties::kBlockCacheUsage =

    rocksdb_prefix + block_cache_usage;

const std::string DB::Properties::kBlockCachePinnedUsage =

    rocksdb_prefix + block_cache_pinned_usage;

const std::string DB::Properties::kOptionsStatistics =

    rocksdb_prefix + options_statistics;

const std::string DB::Properties::kLiveSstFilesSizeAtTemperature =

    rocksdb_prefix + live_sst_files_size_at_temperature;

const std::string DB::Properties::kNumBlobFiles =

    rocksdb_prefix + num_blob_files;

const std::string DB::Properties::kBlobStats = rocksdb_prefix + blob_stats;

const std::string DB::Properties::kTotalBlobFileSize =

    rocksdb_prefix + total_blob_file_size;

const std::string DB::Properties::kLiveBlobFileSize =

    rocksdb_prefix + live_blob_file_size;

const std::string DB::Properties::kLiveBlobFileGarbageSize =

    rocksdb_prefix + live_blob_file_garbage_size;

const std::string DB::Properties::kBlobCacheCapacity =

    rocksdb_prefix + blob_cache_capacity;

const std::string DB::Properties::kBlobCacheUsage =

    rocksdb_prefix + blob_cache_usage;

const std::string DB::Properties::kBlobCachePinnedUsage =

    rocksdb_prefix + blob_cache_pinned_usage;

const std::string InternalStats::kPeriodicCFStats =

    DB::Properties::kCFStats + ".periodic";

const int InternalStats::kMaxNoChangePeriodSinceDump = 8;

const UnorderedMap<std::string, DBPropertyInfo>

    InternalStats::ppt_name_to_info = {

        {DB::Properties::kNumFilesAtLevelPrefix,

         {false, &InternalStats::HandleNumFilesAtLevel, nullptr, nullptr,

          nullptr}},

        {DB::Properties::kCompressionRatioAtLevelPrefix,

         {false, &InternalStats::HandleCompressionRatioAtLevelPrefix, nullptr,

          nullptr, nullptr}},

        {DB::Properties::kLevelStats,

         {false, &InternalStats::HandleLevelStats, nullptr, nullptr, nullptr}},

        {DB::Properties::kStats,

         {false, &InternalStats::HandleStats, nullptr, nullptr, nullptr}},

        {DB::Properties::kCFStats,

         {false, &InternalStats::HandleCFStats, nullptr,

          &InternalStats::HandleCFMapStats, nullptr}},

        {InternalStats::kPeriodicCFStats,

         {false, &InternalStats::HandleCFStatsPeriodic, nullptr, nullptr,

          nullptr}},

        {DB::Properties::kCFStatsNoFileHistogram,

         {false, &InternalStats::HandleCFStatsNoFileHistogram, nullptr, nullptr,

          nullptr}},

        {DB::Properties::kCFFileHistogram,

         {false, &InternalStats::HandleCFFileHistogram, nullptr, nullptr,

          nullptr}},

        {DB::Properties::kCFWriteStallStats,

         {false, &InternalStats::HandleCFWriteStallStats, nullptr,

          &InternalStats::HandleCFWriteStallStatsMap, nullptr}},

        {DB::Properties::kDBStats,

         {false, &InternalStats::HandleDBStats, nullptr,

          &InternalStats::HandleDBMapStats, nullptr}},

        {DB::Properties::kDBWriteStallStats,

         {false, &InternalStats::HandleDBWriteStallStats, nullptr,

          &InternalStats::HandleDBWriteStallStatsMap, nullptr}},

        {DB::Properties::kBlockCacheEntryStats,

         {true, &InternalStats::HandleBlockCacheEntryStats, nullptr,

          &InternalStats::HandleBlockCacheEntryStatsMap, nullptr}},

        {DB::Properties::kFastBlockCacheEntryStats,

         {true, &InternalStats::HandleFastBlockCacheEntryStats, nullptr,

          &InternalStats::HandleFastBlockCacheEntryStatsMap, nullptr}},

        {DB::Properties::kSSTables,

         {false, &InternalStats::HandleSsTables, nullptr, nullptr, nullptr}},

        {DB::Properties::kAggregatedTableProperties,

         {false, &InternalStats::HandleAggregatedTableProperties, nullptr,

          &InternalStats::HandleAggregatedTablePropertiesMap, nullptr}},

        {DB::Properties::kAggregatedTablePropertiesAtLevel,

         {false, &InternalStats::HandleAggregatedTablePropertiesAtLevel,

          nullptr, &InternalStats::HandleAggregatedTablePropertiesAtLevelMap,

          nullptr}},

        {DB::Properties::kNumImmutableMemTable,

         {false, nullptr, &InternalStats::HandleNumImmutableMemTable, nullptr,

          nullptr}},

        {DB::Properties::kNumImmutableMemTableFlushed,

         {false, nullptr, &InternalStats::HandleNumImmutableMemTableFlushed,

          nullptr, nullptr}},

        {DB::Properties::kMemTableFlushPending,

         {false, nullptr, &InternalStats::HandleMemTableFlushPending, nullptr,

          nullptr}},

        {DB::Properties::kCompactionPending,

         {false, nullptr, &InternalStats::HandleCompactionPending, nullptr,

          nullptr}},

        {DB::Properties::kBackgroundErrors,

         {false, nullptr, &InternalStats::HandleBackgroundErrors, nullptr,

          nullptr}},

        {DB::Properties::kCurSizeActiveMemTable,

         {false, nullptr, &InternalStats::HandleCurSizeActiveMemTable, nullptr,

          nullptr}},

        {DB::Properties::kCurSizeAllMemTables,

         {false, nullptr, &InternalStats::HandleCurSizeAllMemTables, nullptr,

          nullptr}},

        {DB::Properties::kSizeAllMemTables,

         {false, nullptr, &InternalStats::HandleSizeAllMemTables, nullptr,

          nullptr}},

        {DB::Properties::kNumEntriesActiveMemTable,

         {false, nullptr, &InternalStats::HandleNumEntriesActiveMemTable,

          nullptr, nullptr}},

        {DB::Properties::kNumEntriesImmMemTables,

         {false, nullptr, &InternalStats::HandleNumEntriesImmMemTables, nullptr,

          nullptr}},

        {DB::Properties::kNumDeletesActiveMemTable,

         {false, nullptr, &InternalStats::HandleNumDeletesActiveMemTable,

          nullptr, nullptr}},

        {DB::Properties::kNumDeletesImmMemTables,

         {false, nullptr, &InternalStats::HandleNumDeletesImmMemTables, nullptr,

          nullptr}},

        {DB::Properties::kEstimateNumKeys,

         {false, nullptr, &InternalStats::HandleEstimateNumKeys, nullptr,

          nullptr}},

        {DB::Properties::kEstimateTableReadersMem,

         {true, nullptr, &InternalStats::HandleEstimateTableReadersMem, nullptr,

          nullptr}},

        {DB::Properties::kIsFileDeletionsEnabled,

         {false, nullptr, &InternalStats::HandleIsFileDeletionsEnabled, nullptr,

          nullptr}},

        {DB::Properties::kNumSnapshots,

         {false, nullptr, &InternalStats::HandleNumSnapshots, nullptr,

          nullptr}},

        {DB::Properties::kOldestSnapshotTime,

         {false, nullptr, &InternalStats::HandleOldestSnapshotTime, nullptr,

          nullptr}},

        {DB::Properties::kOldestSnapshotSequence,

         {false, nullptr, &InternalStats::HandleOldestSnapshotSequence, nullptr,

          nullptr}},

        {DB::Properties::kNumLiveVersions,

         {false, nullptr, &InternalStats::HandleNumLiveVersions, nullptr,

          nullptr}},

        {DB::Properties::kCurrentSuperVersionNumber,

         {false, nullptr, &InternalStats::HandleCurrentSuperVersionNumber,

          nullptr, nullptr}},

        {DB::Properties::kEstimateLiveDataSize,

         {true, nullptr, &InternalStats::HandleEstimateLiveDataSize, nullptr,

          nullptr}},

        {DB::Properties::kMinLogNumberToKeep,

         {false, nullptr, &InternalStats::HandleMinLogNumberToKeep, nullptr,

          nullptr}},

        {DB::Properties::kMinObsoleteSstNumberToKeep,

         {false, nullptr, &InternalStats::HandleMinObsoleteSstNumberToKeep,

          nullptr, nullptr}},

        {DB::Properties::kBaseLevel,

         {false, nullptr, &InternalStats::HandleBaseLevel, nullptr, nullptr}},

        {DB::Properties::kTotalSstFilesSize,

         {false, nullptr, &InternalStats::HandleTotalSstFilesSize, nullptr,

          nullptr}},

        {DB::Properties::kLiveSstFilesSize,

         {false, nullptr, &InternalStats::HandleLiveSstFilesSize, nullptr,

          nullptr}},

        {DB::Properties::kLiveSstFilesSizeAtTemperature,

         {false, &InternalStats::HandleLiveSstFilesSizeAtTemperature, nullptr,

          nullptr, nullptr}},

        {DB::Properties::kObsoleteSstFilesSize,

         {false, nullptr, &InternalStats::HandleObsoleteSstFilesSize, nullptr,

          nullptr}},

        {DB::Properties::kEstimatePendingCompactionBytes,

         {false, nullptr, &InternalStats::HandleEstimatePendingCompactionBytes,

          nullptr, nullptr}},

        {DB::Properties::kNumRunningFlushes,

         {false, nullptr, &InternalStats::HandleNumRunningFlushes, nullptr,

          nullptr}},

        {DB::Properties::kNumRunningCompactions,

         {false, nullptr, &InternalStats::HandleNumRunningCompactions, nullptr,

          nullptr}},

        {DB::Properties::kNumRunningRemoteCompactions,

         {false, nullptr, &InternalStats::HandleNumRunningRemoteCompactions,

          nullptr, nullptr}},

        {DB::Properties::kNumRemoteCompactionPoolThreads,

         {false, nullptr, &InternalStats::HandleNumRemoteCompactionPoolThreads,

          nullptr, nullptr}},

        {DB::Properties::kNumRunningBottomCompactions,

         {false, nullptr, &InternalStats::HandleNumRunningBottomCompactions,

          nullptr, nullptr}},

        {DB::Properties::kNumRunningCompactionSortedRuns,

         {false, nullptr, &InternalStats::HandleNumRunningCompactionSortedRuns,

          nullptr, nullptr}},

        {DB::Properties::kCompactionAbortCount,

         {false, nullptr, &InternalStats::HandleCompactionAbortCount, nullptr,

          nullptr}},

        {DB::Properties::kNumUnscheduledCompactions,

         {false, nullptr, &InternalStats::HandleNumUnscheduledCompactions,

          nullptr, nullptr}},

        {DB::Properties::kActualDelayedWriteRate,

         {false, nullptr, &InternalStats::HandleActualDelayedWriteRate, nullptr,

          nullptr}},

        {DB::Properties::kIsWriteStopped,

         {false, nullptr, &InternalStats::HandleIsWriteStopped, nullptr,

          nullptr}},

        {DB::Properties::kEstimateOldestKeyTime,

         {false, nullptr, &InternalStats::HandleEstimateOldestKeyTime, nullptr,

          nullptr}},

        {DB::Properties::kBlockCacheCapacity,

         {false, nullptr, &InternalStats::HandleBlockCacheCapacity, nullptr,

          nullptr}},

        {DB::Properties::kBlockCacheUsage,

         {false, nullptr, &InternalStats::HandleBlockCacheUsage, nullptr,

          nullptr}},

        {DB::Properties::kBlockCachePinnedUsage,

         {false, nullptr, &InternalStats::HandleBlockCachePinnedUsage, nullptr,

          nullptr}},

        {DB::Properties::kOptionsStatistics,

         {true, nullptr, nullptr, nullptr,

          &DBImpl::GetPropertyHandleOptionsStatistics}},

        {DB::Properties::kNumBlobFiles,

         {false, nullptr, &InternalStats::HandleNumBlobFiles, nullptr,

          nullptr}},

        {DB::Properties::kBlobStats,

         {false, &InternalStats::HandleBlobStats, nullptr, nullptr, nullptr}},

        {DB::Properties::kTotalBlobFileSize,

         {false, nullptr, &InternalStats::HandleTotalBlobFileSize, nullptr,

          nullptr}},

        {DB::Properties::kLiveBlobFileSize,

         {false, nullptr, &InternalStats::HandleLiveBlobFileSize, nullptr,

          nullptr}},

        {DB::Properties::kLiveBlobFileGarbageSize,

         {false, nullptr, &InternalStats::HandleLiveBlobFileGarbageSize,

          nullptr, nullptr}},

        {DB::Properties::kBlobCacheCapacity,

         {false, nullptr, &InternalStats::HandleBlobCacheCapacity, nullptr,

          nullptr}},

        {DB::Properties::kBlobCacheUsage,

         {false, nullptr, &InternalStats::HandleBlobCacheUsage, nullptr,

          nullptr}},

        {DB::Properties::kBlobCachePinnedUsage,

         {false, nullptr, &InternalStats::HandleBlobCachePinnedUsage, nullptr,

          nullptr}},

};

InternalStats::InternalStats(int num_levels, SystemClock* clock,

                             ColumnFamilyData* cfd)

    : db_stats_{},

      cf_stats_value_{},

      cf_stats_count_{},

      comp_stats_(num_levels),

      comp_stats_by_pri_(Env::Priority::TOTAL),

      file_read_latency_(num_levels),

      has_cf_change_since_dump_(true),

      bg_error_count_(0),

      num_running_compaction_sorted_runs_(0),

      number_levels_(num_levels),

      clock_(clock),

      cfd_(cfd),

      started_at_(clock->NowMicros()) {

  Cache* block_cache = GetBlockCacheForStats();

  if (block_cache) {

    // Extract or create stats collector. Could fail in rare cases.

    Status s = CacheEntryStatsCollector<CacheEntryRoleStats>::GetShared(

        block_cache, clock_, &cache_entry_stats_collector_);

    if (s.ok()) {

      assert(cache_entry_stats_collector_);

    } else {

      assert(!cache_entry_stats_collector_);

    }

  }

}

void InternalStats::TEST_GetCacheEntryRoleStats(CacheEntryRoleStats* stats,

                                                bool foreground) {

  CollectCacheEntryStats(foreground);

  if (cache_entry_stats_collector_) {

    cache_entry_stats_collector_->GetStats(stats);

  }

}

void InternalStats::CollectCacheEntryStats(bool foreground) {

  // This function is safe to call from any thread because

  // cache_entry_stats_collector_ field is const after constructor

  // and ->GetStats does its own synchronization, which also suffices for

  // cache_entry_stats_.

  if (!cache_entry_stats_collector_) {

    return;  // nothing to do (e.g. no block cache)

  }

  // For "background" collections, strictly cap the collection time by

  // expanding effective cache TTL. For foreground, be more aggressive about

  // getting latest data.

  int min_interval_seconds = foreground ? 10 : 180;

  // 1/500 = max of 0.2% of one CPU thread

  int min_interval_factor = foreground ? 10 : 500;

  cache_entry_stats_collector_->CollectStats(min_interval_seconds,

                                             min_interval_factor);

}

std::function<void(const Slice& key, Cache::ObjectPtr value, size_t charge,

                   const Cache::CacheItemHelper* helper)>

InternalStats::CacheEntryRoleStats::GetEntryCallback() {

  return [&](const Slice& /*key*/, Cache::ObjectPtr /*value*/, size_t charge,

             const Cache::CacheItemHelper* helper) -> void {

    size_t role_idx =

        static_cast<size_t>(helper ? helper->role : CacheEntryRole::kMisc);

    entry_counts[role_idx]++;

    total_charges[role_idx] += charge;

  };

}

void InternalStats::CacheEntryRoleStats::BeginCollection(

    Cache* cache, SystemClock*, uint64_t start_time_micros) {

  Clear();

  last_start_time_micros_ = start_time_micros;

  ++collection_count;

  std::ostringstream str;

  str << cache->Name() << "@" << static_cast<void*>(cache) << "#"

      << port::GetProcessID();

  cache_id = str.str();

  cache_capacity = cache->GetCapacity();

  cache_usage = cache->GetUsage();

  table_size = cache->GetTableAddressCount();

  occupancy = cache->GetOccupancyCount();

  hash_seed = cache->GetHashSeed();

}

void InternalStats::CacheEntryRoleStats::EndCollection(

    Cache*, SystemClock*, uint64_t end_time_micros) {

  last_end_time_micros_ = end_time_micros;

}

void InternalStats::CacheEntryRoleStats::SkippedCollection() {

  ++copies_of_last_collection;

}

uint64_t InternalStats::CacheEntryRoleStats::GetLastDurationMicros() const {

  if (last_end_time_micros_ > last_start_time_micros_) {

    return last_end_time_micros_ - last_start_time_micros_;

  } else {

    return 0U;

  }

}

std::string InternalStats::CacheEntryRoleStats::ToString(

    SystemClock* clock) const {

  std::ostringstream str;

  str << "Block cache " << cache_id

      << " capacity: " << BytesToHumanString(cache_capacity)

      << " seed: " << hash_seed << " usage: " << BytesToHumanString(cache_usage)

      << " table_size: " << table_size << " occupancy: " << occupancy

      << " collections: " << collection_count

      << " last_copies: " << copies_of_last_collection

      << " last_secs: " << (GetLastDurationMicros() / 1000000.0)

      << " secs_since: "

      << ((clock->NowMicros() - last_end_time_micros_) / 1000000U) << "\n";

  str << "Block cache entry stats(count,size,portion):";

  for (size_t i = 0; i < kNumCacheEntryRoles; ++i) {

    if (entry_counts[i] > 0) {

      str << " " << kCacheEntryRoleToCamelString[i] << "(" << entry_counts[i]

          << "," << BytesToHumanString(total_charges[i]) << ","

          << (100.0 * total_charges[i] / cache_capacity) << "%)";

    }

  }

  str << "\n";

  return str.str();

}

void InternalStats::CacheEntryRoleStats::ToMap(

    std::map<std::string, std::string>* values, SystemClock* clock) const {

  values->clear();

  auto& v = *values;

  v[BlockCacheEntryStatsMapKeys::CacheId()] = cache_id;

  v[BlockCacheEntryStatsMapKeys::CacheCapacityBytes()] =

      std::to_string(cache_capacity);

  v[BlockCacheEntryStatsMapKeys::LastCollectionDurationSeconds()] =

      std::to_string(GetLastDurationMicros() / 1000000.0);

  v[BlockCacheEntryStatsMapKeys::LastCollectionAgeSeconds()] =

      std::to_string((clock->NowMicros() - last_end_time_micros_) / 1000000U);

  for (size_t i = 0; i < kNumCacheEntryRoles; ++i) {

    auto role = static_cast<CacheEntryRole>(i);

    v[BlockCacheEntryStatsMapKeys::EntryCount(role)] =

        std::to_string(entry_counts[i]);

    v[BlockCacheEntryStatsMapKeys::UsedBytes(role)] =

        std::to_string(total_charges[i]);

    v[BlockCacheEntryStatsMapKeys::UsedPercent(role)] =

        std::to_string(100.0 * total_charges[i] / cache_capacity);

  }

}

bool InternalStats::HandleBlockCacheEntryStatsInternal(std::string* value,

                                                       bool fast) {

  if (!cache_entry_stats_collector_) {

    return false;

  }

  CollectCacheEntryStats(!fast /* foreground */);

  CacheEntryRoleStats stats;

  cache_entry_stats_collector_->GetStats(&stats);

  *value = stats.ToString(clock_);

  return true;

}

bool InternalStats::HandleBlockCacheEntryStatsMapInternal(

    std::map<std::string, std::string>* values, bool fast) {

  if (!cache_entry_stats_collector_) {

    return false;

  }

  CollectCacheEntryStats(!fast /* foreground */);

  CacheEntryRoleStats stats;

  cache_entry_stats_collector_->GetStats(&stats);

  stats.ToMap(values, clock_);

  return true;

}

bool InternalStats::HandleBlockCacheEntryStats(std::string* value,

                                               Slice /*suffix*/) {

  return HandleBlockCacheEntryStatsInternal(value, false /* fast */);

}

bool InternalStats::HandleBlockCacheEntryStatsMap(

    std::map<std::string, std::string>* values, Slice /*suffix*/) {

  return HandleBlockCacheEntryStatsMapInternal(values, false /* fast */);

}

bool InternalStats::HandleFastBlockCacheEntryStats(std::string* value,

                                                   Slice /*suffix*/) {

  return HandleBlockCacheEntryStatsInternal(value, true /* fast */);

}

bool InternalStats::HandleFastBlockCacheEntryStatsMap(

    std::map<std::string, std::string>* values, Slice /*suffix*/) {

  return HandleBlockCacheEntryStatsMapInternal(values, true /* fast */);

}

bool InternalStats::HandleLiveSstFilesSizeAtTemperature(std::string* value,

                                                        Slice suffix) {

  uint64_t temperature;

  bool ok = ConsumeDecimalNumber(&suffix, &temperature) && suffix.empty();

  if (!ok) {

    return false;

  }

  uint64_t size = 0;

  const auto* vstorage = cfd_->current()->storage_info();

  for (int level = 0; level < vstorage->num_levels(); level++) {

    for (const auto& file_meta : vstorage->LevelFiles(level)) {

      if (static_cast<uint8_t>(file_meta->temperature) == temperature) {

        size += file_meta->fd.GetFileSize();

      }

    }

  }

  *value = std::to_string(size);

  return true;

}

bool InternalStats::HandleNumBlobFiles(uint64_t* value, DBImpl* /*db*/,

                                       Version* /*version*/) {

  assert(value);

  assert(cfd_);

  const auto* current = cfd_->current();

  assert(current);

  const auto* vstorage = current->storage_info();

  assert(vstorage);

  const auto& blob_files = vstorage->GetBlobFiles();

  *value = blob_files.size();

  return true;

}

bool InternalStats::HandleBlobStats(std::string* value, Slice /*suffix*/) {

  assert(value);

  assert(cfd_);

  const auto* current = cfd_->current();

  assert(current);

  const auto* vstorage = current->storage_info();

  assert(vstorage);

  const auto blob_st = vstorage->GetBlobStats();

  std::ostringstream oss;

  oss << "Number of blob files: " << vstorage->GetBlobFiles().size()

      << "\nTotal size of blob files: " << blob_st.total_file_size

      << "\nTotal size of garbage in blob files: " << blob_st.total_garbage_size

      << "\nBlob file space amplification: " << blob_st.space_amp << '\n';

  value->append(oss.str());

  return true;

}

bool InternalStats::HandleTotalBlobFileSize(uint64_t* value, DBImpl* /*db*/,

                                            Version* /*version*/) {

  assert(value);

  assert(cfd_);

  *value = cfd_->GetTotalBlobFileSize();

  return true;

}

bool InternalStats::HandleLiveBlobFileSize(uint64_t* value, DBImpl* /*db*/,

                                           Version* /*version*/) {

  assert(value);

  assert(cfd_);

  const auto* current = cfd_->current();

  assert(current);

  const auto* vstorage = current->storage_info();

  assert(vstorage);

  *value = vstorage->GetBlobStats().total_file_size;

  return true;

}

bool InternalStats::HandleLiveBlobFileGarbageSize(uint64_t* value,

                                                  DBImpl* /*db*/,

                                                  Version* /*version*/) {

  assert(value);

  assert(cfd_);

  const auto* current = cfd_->current();

  assert(current);

  const auto* vstorage = current->storage_info();

  assert(vstorage);

  *value = vstorage->GetBlobStats().total_garbage_size;

  return true;

}

Cache* InternalStats::GetBlobCacheForStats() {

  return cfd_->ioptions().blob_cache.get();

}

bool InternalStats::HandleBlobCacheCapacity(uint64_t* value, DBImpl* /*db*/,

                                            Version* /*version*/) {

  Cache* blob_cache = GetBlobCacheForStats();

  if (blob_cache) {

    *value = static_cast<uint64_t>(blob_cache->GetCapacity());

    return true;

  }

  return false;

}

bool InternalStats::HandleBlobCacheUsage(uint64_t* value, DBImpl* /*db*/,

                                         Version* /*version*/) {

  Cache* blob_cache = GetBlobCacheForStats();

  if (blob_cache) {

    *value = static_cast<uint64_t>(blob_cache->GetUsage());

    return true;

  }

  return false;

}

bool InternalStats::HandleBlobCachePinnedUsage(uint64_t* value, DBImpl* /*db*/,

                                               Version* /*version*/) {

  Cache* blob_cache = GetBlobCacheForStats();

  if (blob_cache) {

    *value = static_cast<uint64_t>(blob_cache->GetPinnedUsage());

    return true;

  }

  return false;

}

const DBPropertyInfo* GetPropertyInfo(const Slice& property) {

  std::string ppt_name = GetPropertyNameAndArg(property).first.ToString();

  auto ppt_info_iter = InternalStats::ppt_name_to_info.find(ppt_name);

  if (ppt_info_iter == InternalStats::ppt_name_to_info.end()) {

    return nullptr;

  }

  return &ppt_info_iter->second;

}

bool InternalStats::GetStringProperty(const DBPropertyInfo& property_info,

                                      const Slice& property,

                                      std::string* value) {

  assert(value != nullptr);

  assert(property_info.handle_string != nullptr);

  Slice arg = GetPropertyNameAndArg(property).second;

  return (this->*(property_info.handle_string))(value, arg);

}

bool InternalStats::GetMapProperty(const DBPropertyInfo& property_info,

                                   const Slice& property,

                                   std::map<std::string, std::string>* value) {

  assert(value != nullptr);

  assert(property_info.handle_map != nullptr);

  Slice arg = GetPropertyNameAndArg(property).second;

  return (this->*(property_info.handle_map))(value, arg);

}

bool InternalStats::GetIntProperty(const DBPropertyInfo& property_info,

                                   uint64_t* value, DBImpl* db) {

  assert(value != nullptr);

  assert(property_info.handle_int != nullptr &&

         !property_info.need_out_of_mutex);