git-hulk commented on code in PR #3075:
URL: https://github.com/apache/kvrocks/pull/3075#discussion_r2247848253
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src/cluster/replication.cc:
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@@ -203,6 +206,21 @@ void FeedSlaveThread::loop() {
Stop();
return;
}
+
+ // Check if this change would unblock any WAIT command
+ auto largest_unblockable_seq =
srv_->LargestTargetSeqToWakeup(batch.sequence);
+ if (largest_unblockable_seq > last_replconf_getack_seq_) {
+ // Send _getack to the slave to get acknowledgment
+ auto s = util::SockSend(conn_->GetFD(), redis::BulkString("_getack"),
conn_->GetBufferEvent());
+ if (!s.IsOK()) {
+ error("Write error while sending _getack to slave: {}", s.Msg());
+ Stop();
+ return;
+ } else {
+ last_replconf_getack_seq_ = largest_unblockable_seq;
Review Comment:
Should we set `last_replconf_getack_seq_` to `largest_unblockable_seq` when
the value of `largest_unblockable_seq` is zero?
By the way, do you think if it's good to merge the `_getack` command into
`batches_bulk`? so that we can reduce one send call.
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