@Override
    protected void writeRegionOpenMarker(WAL wal, long openSeqId) throws IOException {
      // not write the region open marker to interrupt the test.
    }
The {@link RegionReplicationSink#failedReplicas} is cleared by the
{@link FlushAction#CANNOT_FLUSH} marker.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/regionreplication/TestRegionReplicationForFlushMarker.java