RPC message compression

OBKV supports message compression for RPC when responding to query requests. By default, RPC compression is disabled. OBKV provides the following parameters to enable RPC compression and control the compression threshold:

• kv_transport_compress_func The default value is none. Four compression algorithms are supported: lz4_1.0, snappy_1.0, zstd_1.0, and zstd 1.3.8.
• kv_transport_compress_threshold The default value is 10K. After kv_transport_compress_func is set, compression will only be performed when the query result set exceeds the threshold.

Here is an example:

alter system set kv_transport_compress_func="lz4_1.0";
alter system set kv_transport_compress_threshold='1M';