message: update default conf
diff: @@ -55,13 +55,14 @@ rocksdb.scan-total-order false
  # Disable RocksDB WAL may improve the write performance but
  # data in the un-flushed memtables might be lost in case of a RocksDB shutdown.
  # Disabling WAL provides similar guarantees as Redis.
  -rocksdb.disableWAL true
  +rocksdb.disableWAL false
  #rocksdb's options
  rocksdb.options write_buffer_size=512M;max_write_buffer_number=5;min_write_buffer_number_to_merge=3;compression=kSnappyCompression;\
  bloom_locality=1;memtable_prefix_bloom_size_ratio=0.1;\
  block_based_table_factory={block_cache=512M;filter_policy=bloomfilter:10:true};\
  - create_if_missing=true;max_open_files=10000;rate_limiter_bytes_per_sec=50M
  + create_if_missing=true;max_open_files=10000;rate_limiter_bytes_per_sec=50M;\
  + use_direct_io_for_flush_and_compaction=true;use_adaptive_mutex=true
  #leveldb's options
  leveldb.options block_cache_size=512M,write_buffer_size=128M,max_open_files=5000,block_size=4k,block_restart_interval=16,\
  