@BeforeClass
  public static void setUpBeforeClass() throws Exception {
    // Use a small flush size to create more HFiles.
    conf.setInt(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, 1024 * 1024);
    // Disabling split to make sure split does not cause modify column to wait which timesout test
    // sometime
    conf.set(HConstants.HBASE_REGION_SPLIT_POLICY_KEY,
      "org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy");
    // ((Log4JLogger)RpcServerImplementation.LOG).getLogger().setLevel(Level.TRACE);
    // ((Log4JLogger)RpcClient.LOG).getLogger().setLevel(Level.TRACE);
    TEST_UTIL.startMiniCluster();
  }
A zero-based index of the current batch of test data being written
hbase-server/src/test/java/org/apache/hadoop/hbase/io/encoding/TestChangingEncoding.java