public static void main(String[] args) throws Exception {
    Configuration conf = HBaseConfiguration.create();
    IntegrationTestingUtility.setUseDistributedCluster(conf);
    int ret = ToolRunner.run(conf, new IntegrationTestRegionReplicaReplication(), args);
    System.exit(ret);
  }
This extends MultiThreadedWriter to add a configurable delay to the keys written by the writer
threads to become available to the MultiThradedReader threads. We add this delay because of the
async nature of the wal replication to region replicas.
hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestRegionReplicaReplication.java