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PSYNC2: Save replication ID/offset on RDB file.

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This means that stopping a slave and restarting it will still make it
able to PSYNC with the master. Moreover the master itself will retain
its ID/offset, in case it gets turned into a slave, or if a slave will
try to PSYNC with it with an exactly updated offset (otherwise there is
no backlog).

This change was possible thanks to PSYNC v2 that makes saving the current
replication state much simpler.
This commit is contained in:
antirez
2016-11-10 12:35:29 +01:00
parent 4e5e366ed2
commit 28c96d73b2
4 changed files with 29 additions and 3 deletions
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13
src/server.c
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@ -3423,9 +3423,20 @@ void loadDataFromDisk(void) {
if (loadAppendOnlyFile(server.aof_filename) == C_OK)
serverLog(LL_NOTICE,"DB loaded from append only file: %.3f seconds",(float)(ustime()-start)/1000000);
} else {
if (rdbLoad(server.rdb_filename,NULL) == C_OK) {
rdbSaveInfo rsi = RDB_SAVE_INFO_INIT;
if (rdbLoad(server.rdb_filename,&rsi) == C_OK) {
serverLog(LL_NOTICE,"DB loaded from disk: %.3f seconds",
(float)(ustime()-start)/1000000);
/* Restore the replication ID / offset from the RDB file. */
if (rsi.repl_id_is_set && rsi.repl_offset != -1) {
memcpy(server.replid,rsi.repl_id,sizeof(server.replid));
server.master_repl_offset = rsi.repl_offset;
/* If we are a slave, create a cached master from this
* information, in order to allow partial resynchronizations
* with masters. */
if (server.masterhost) replicationCacheMasterUsingMyself();
}
} else if (errno != ENOENT) {
serverLog(LL_WARNING,"Fatal error loading the DB: %s. Exiting.",strerror(errno));
exit(1);