message: Remove duplicate rocksdb_block_cache config.
diff: # recommend: 1/3 of all memory
  --rocksdb_block_cache=4096
  -# The default block cache size used in BlockBasedTable.
  -# The unit is MB.
  ---rocksdb_block_cache=1024
  -
  # Compression algorithm, options: no,snappy,lz4,lz4hc,zlib,bzip2,zstd
  # For the sake of binary compatibility, the default value is snappy.
  # Recommend to use:
  