public MiniMRCluster startMiniMapReduceCluster() throws IOException {
    // Set a very high max-disk-utilization percentage to avoid the NodeManagers from failing.
    conf.setIfUnset("yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage",
      "99.0");
    startMiniMapReduceCluster(2);
    return mrCluster;
  }
Starts a <code>MiniMRCluster</code> with a default number of <code>TaskTracker</code>'s.
@throws IOException When starting the cluster fails.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java