Module defaults

The following are defaults (and default strings for LD parameters) for RocksDBTuningParameters.

Constants

• DEFAULT_AUTO_SPILL_MEMORY_THRESHOLD
  The default for spilling from memory to rocksdb is 2 write buffers. Some initial tests found that 2 write buffers were the minimum memory usage of rocksdb when processing small amounts of data.
• DEFAULT_BATCH_SIZE
  A reasonable default batch size for gets and puts in RocksDB. Based on advice here: https://github.com/facebook/rocksdb/wiki/RocksDB-FAQ. Based on our testing we are using 20 times that.
• DEFAULT_BOTTOMMOST_COMPRESSION_TYPE
• DEFAULT_COMPACTION_STYLE
• DEFAULT_COMPRESSION_TYPE
• DEFAULT_LEVEL_COMPACTION_DYNAMIC_LEVEL_BYTES
• DEFAULT_OPTIMIZE_COMPACTION_MEMTABLE_BUDGET
  From here: https://github.com/facebook/rocksdb/blob/main/include/rocksdb/options.h#L102 And then setting it to 1/3rd from our testing in production
• DEFAULT_PARALLELISM
• DEFAULT_RETRY_DURATION
  The default max duration for retrying the retry-able errors in rocksdb.
• DEFAULT_SHRINK_BUFFERS_BY_RATIO
  Default is 0, i.e. shrinking will be disabled
• DEFAULT_STATS_LOG_INTERVAL_S
  Default is 10 minutes, from https://docs.rs/rocksdb/latest/rocksdb/struct.Options.html#method.set_stats_dump_period_sec
• DEFAULT_STATS_PERSIST_INTERVAL_S
  Default is 10 minutes, from https://docs.rs/rocksdb/latest/rocksdb/struct.Options.html#method.set_stats_persist_period_sec
• DEFAULT_UNIVERSAL_COMPACTION_RATIO
  From here: https://docs.rs/rocksdb/latest/rocksdb/struct.UniversalCompactOptions.html
• DEFAULT_WRITE_BUFFER_MANAGER_ALLOW_STALL
  Not allowing stalls for write buffer manager. Only applicable if write buffer manager is enabled by other flags.