private WALKeyImpl createWALKey(long now) {
      // for MutationBatchOperation,isReplay is false.
      return this.region.createWALKeyForWALAppend(false, this, now, this.nonceGroup, this.nonce);
    }
Here is for HBASE-26993 case 2,all {@link Mutation}s are {@link Durability#SKIP_WAL}. In
order to make the new framework for region replication could work for SKIP_WAL,because
there is no {@link RegionReplicationSink#add} attached in {@link HRegion#doWALAppend},so
here we get {@link WALEdit} from
{@link MiniBatchOperationInProgress#getWalEditForReplicateIfExistsSkipWAL} and attach
{@link RegionReplicationSink#add} to the new mvcc writeEntry.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java