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.
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