@Override
    protected boolean doAction() throws Exception {
      Admin admin = null;
      try {
        admin = util.getAdmin();
        ClusterMetrics status = admin.getClusterMetrics();
        return status != null;
      } finally {
        if (admin != null) {
          admin.close();
        }
      }
    }
Callable that will keep going to the master for cluster status. Returns the max time taken.
hbase-it/src/test/java/org/apache/hadoop/hbase/mttr/IntegrationTestMTTR.java