public boolean isDistributedCluster() {
    Configuration conf = getConfiguration();
    boolean isDistributedCluster =
      Boolean.parseBoolean(System.getProperty(IS_DISTRIBUTED_CLUSTER, "false"));
    if (!isDistributedCluster) {
      isDistributedCluster = conf.getBoolean(IS_DISTRIBUTED_CLUSTER, false);
    }
    return isDistributedCluster;
  }
Returns whether we are interacting with a distributed cluster as opposed to and in-process mini
cluster or a local cluster.
@see IntegrationTestingUtility#setUseDistributedCluster(Configuration)
hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestingUtility.java