comnetwork commented on code in PR #4707: URL: https://github.com/apache/hbase/pull/4707#discussion_r952689280
########## hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java: ########## @@ -8040,11 +8040,17 @@ private WriteEntry doWALAppend(WALEdit walEdit, BatchOperation<?> batchOp, try { long txid = this.wal.appendData(this.getRegionInfo(), walKey, walEdit); WriteEntry writeEntry = walKey.getWriteEntry(); - this.attachRegionReplicationInWALAppend(batchOp, miniBatchOp, walKey, walEdit, writeEntry); // Call sync on our edit. if (txid != 0) { sync(txid, batchOp.durability); } + /** + * If above {@link HRegion#sync} throws Exception, the RegionServer should be aborted and + * following {@link BatchOperation#writeMiniBatchOperationsToMemStore} will not be executed, + * so there is no need to replicate to secondary replica, for this reason here we attach the + * region replication action after the {@link HRegion#sync} is successful. + */ + this.attachRegionReplicationInWALAppend(batchOp, miniBatchOp, walKey, walEdit, writeEntry); Review Comment: @Apache9 , the replication is fired by `MVCC.complete`, so seems that attaching it before `WAL.sync` could not speed up the replication.By the previous discussion in HBASE-27223 and https://github.com/apache/hbase/pull/4633, `sync` may throws exception(especially for FSHLog, it has no retry and may throws any exception thrown by `ProtobufLogWriter.append` or `ProtobufLogWriter.sync` ,and it may not abort the regionServer, HBASE-27231 try to solve this problem), attaching the region replication after sync success could try to avoid data inconsistent between primary and secondary replicas,and if `WAL.sync `throws exception, we have no need to replicate to secondary region replicas whether RegionServer is aborted or not. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@hbase.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org