@Override
    public AsyncClusterConnection createConnection(URI clusterURI, Configuration conf)
      throws IOException {
      return null;
    }
Once a SinkPeer has been reported as bad more than BAD_SINK_THRESHOLD times, it should not be
replicated to anymore.
hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestHBaseReplicationEndpoint.java