lcompact_community.json

{
    "http": {
      "document_root": "/dev/shm",
      "listening_ports": "8081"
    },
    "setenv": {
      "DictZipBlobStore_zipThreads": 8,
      "StrSimpleEnvNameNotOverwrite": "StringValue",
      "IntSimpleEnvNameNotOverwrite": 16384,
      "OverwriteThisEnv": {
          "//comment": "overwrite is default to false",
          "overwrite": true,
          "value": "force overwrite this env by overwrite true"
      }
    },
    "Cache": {
      "clock-cache-default": {
        "class-needs-TBB": "ClockCache",
        "class": "LRUCache",
        "params": {
          "capacity": 0,
          "num_shard_bits": -1,
          "strict_capacity_limit": false,
          "metadata_charge_policy": "kFullChargeCacheMetadata"
        }
      },
      "lru_cache": {
        "class": "LRUCache",
        "params": {
          "capacity": "4G",
          "num_shard_bits": -1,
          "strict_capacity_limit": false,
          "high_pri_pool_ratio": 0.5,
          "use_adaptive_mutex": false,
          "metadata_charge_policy": "kFullChargeCacheMetadata"
        }
      }
    },
    "Statistics": {
      "stat-strings" : {
        "class": "default",
        "params": {
          "discard_tickers": [
            "# comment",
            "// comment: 可以仅指定前缀，必须是以 . 为边界的前缀，例如下面两个必须分别指定",
            "rocksdb.block.cache",
            "rocksdb.block.cachecompressed",
            "# comment: 上面两个也可以用下面这一个概括",
            "rocksdb.block",
            "# 精确指定",
            "rocksdb.memtable.payload.bytes.at.flush",
            "rocksdb.memtable.garbage.bytes.at.flush",
            "# pika 未使用 txn",
            "rocksdb.txn",
            "rocksdb.blobdb",
            "rocksdb.row.cache",
            "rocksdb.number.block",
            "rocksdb.bloom.filter",
            "rocksdb.persistent",
            "rocksdb.sim.block.cache"
          ],
          "discard_histograms": [
            "# comment: ....",
            "rocksdb.blobdb",
            "rocksdb.bytes.compressed",
            "rocksdb.bytes.decompressed",
            "rocksdb.num.index.and.filter.blocks.read.per.level",
            "rocksdb.num.data.blocks.read.per.level",
            "rocksdb.compression.times.nanos",
            "rocksdb.decompression.times.nanos",
            "rocksdb.read.block.get.micros",
            "rocksdb.write.raw.block.micros",
            "# comment end of array"
          ],
          "stats_level": "kAll",
          "//stats_level": "kExceptDetailedTimers"
        }
      }
    },
    "FilterPolicy": {
      "bloom_filter": {
        "class": "BloomFilter",
        "params": {
          "bits_per_key": 10,
          "use_block_based_builder": false
        }
      }
    },
    "MemTableRepFactory": {
      "cspp": {
        "class": "cspp",
        "params": {
          "mem_cap": "256M",
          "use_vm": false,
          "token_use_idle": true
        }
      },
      "skiplist": {
        "class": "SkipList",
        "params": {
          "lookahead": 0
        }
      }
    },
    "TableFactory": {
      "bb": {
        "class": "BlockBasedTable",
        "params": {
          "checksum": "kCRC32c",
          "block_size": "4K",
          "block_restart_interval": 16,
          "index_block_restart_interval": 1,
          "metadata_block_size": "4K",
          "use_raw_size_as_estimated_file_size": true,
          "enable_index_compression": true,
          "block_cache": "${lru_cache}",
          "block_cache_compressed": null,
          "persistent_cache": null,
          "filter_policy": "${bloom_filter}"
        }
      },
      "dispatch": {
        "class": "DispatcherTable",
        "params": {
          "default": "bb",
          "readers": {
            "BlockBasedTable": "bb"
          },
          "level_writers": ["bb", "bb", "bb", "bb", "bb", "bb", "bb", "bb", "bb"]
        }
      }
    },
    "CFOptions": {
      "default": {
        "max_write_buffer_number": 4,
        "write_buffer_size": "128M",
        "target_file_size_base": "16M",
        "target_file_size_multiplier": 2,
        "table_factory": "dispatch",
        "memtable_factory": "$cspp",
        "//memtable_factory": "$skiplist",
        "compression_per_level": [
          "kNoCompression",
          "kNoCompression",
          "kZSTD",
          "kZSTD",
          "kZSTD",
          "kZSTD",
          "kZSTD",
          "kZSTD"
        ],
        "level0_slowdown_writes_trigger": 20,
        "level0_stop_writes_trigger": 36,
        "level0_file_num_compaction_trigger": 4,
        "ttl": 0
      }
    },
    "DBOptions": {
      "dbo": {
        "//bytes_per_sync": "2M",
        "create_if_missing": true,
        "create_missing_column_families": true,
        "//db_paths" : "/dev/shm/strings",
        "max_background_compactions": 40,
        "max_subcompactions": 1,
        "max_level1_subcompactions": 7,
        "inplace_update_support": false,
        "WAL_size_limit_MB": 0,
        "statistics": "${stat-strings}",
        "allow_mmap_reads": false
      }
    },
    "databases": {
      "strings": {
        "method": "DB::Open",
        "params": {
          "db_options": "$dbo",
          "column_families": {
            "default": "$default"
          },
          "//comments": "//path is optional, if not defined, use name as path",
          "path": "/dev/shm/strings"
        }
      }
    },
    "open": "strings"
}