Изменения

* tuned rocksdb: <tt>bluestore_rocksdb_options = compression=kNoCompression,max_write_buffer_number=64,min_write_buffer_number_to_merge=32,recycle_log_file_num=64,compaction_style=kCompactionStyleLevel,<br />write_buffer_size=4MB,target_file_size_base=4MB,max_background_compactions=64,level0_file_num_compaction_trigger=64,level0_slowdown_writes_trigger=128,<br />level0_stop_writes_trigger=256,max_bytes_for_level_base=6GB,compaction_threads=32,flusher_threads=8,compaction_readahead_size=2MB</tt>- this divides into:** 64x32x4 MB memtable memtables (number x merge x size) instead of default 4x1x256 MB. The effect of this change isn’t really clear for me. It may slightly reduce CPU load because sorting a big memtable is slower than sorting a small one. However, 32x4 compactions aren’t probably that much faster than 1x256.