public static void main(String[] args) throws Exception {
    Configuration conf = HBaseConfiguration.create();
    IntegrationTestingUtility.setUseDistributedCluster(conf);
    int ret = ToolRunner.run(conf, new IntegrationTestIngest(), args);
    System.exit(ret);
  }
Estimates a data size based on the cluster size
hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestIngest.java