Replication compression configs and handshake negotiation#16
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Introduces REPLICA_CAPA_COMPRESSION handshake negotiation and a
replcompression boolean config. A replica with replcompression=yes
advertises capa compression during the PSYNC handshake when using
diskless load. The primary records REPLICA_CAPA_COMPRESSION on the
replica's capa bitmask but takes no action on it yet — compressed
replication transport lands in a follow-up.
Compression parameters (algorithm, level) are fixed internally via
REPL_COMPRESSION_ALGO (ALGO_LZ4) and REPL_COMPRESSION_LEVEL (5, HC
mode) and will become configurable in a later release.
- src/server.h: new REPLICA_CAPA_COMPRESSION (1<<4) flag, matching
_STR, repl_compression field, and REPL_COMPRESSION_{ALGO,LEVEL}
constants
- src/config.c: new replcompression bool config
- src/replication.c: primary records capa in replconfCommand; replica
advertises capa compression when server.repl_compression and
useDisklessLoad(); argv/lens arrays grown from 9 to 11 entries;
useDisklessLoad() extracted into a local reused by skip-rdb-checksum
and compression checks
- valkey.conf: new replcompression config documentation block
- src/unit/test_repl_compression.cpp: 3 GTest cases covering capa bit
uniqueness, capa string, and ALGO_LZ4 non-zero
- tests/integration/repl-compression.tcl: 9 TCL integration tests
covering config CRUD, CONFIG REWRITE persistence, and handshake
behavior
Signed-off-by: Roshan Khatri <rvkhatri@amazon.com>
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… config
Introduces REPLICA_CAPA_COMPRESSION handshake negotiation and a replcompression boolean config. A replica with replcompression=yes advertises capa compression during the PSYNC handshake when using diskless load. The primary records REPLICA_CAPA_COMPRESSION on the replica's capa bitmask but takes no action on it yet — compressed replication transport lands in a follow-up.
Compression parameters (algorithm, level) are fixed internally via REPL_COMPRESSION_ALGO (ALGO_LZ4) and REPL_COMPRESSION_LEVEL (5, HC mode) and will become configurable in a later release.