private void enableShortCircuit() {
    if (isReadShortCircuitOn()) {
      String curUser = System.getProperty("user.name");
      LOG.info("read short circuit is ON for user " + curUser);
      // read short circuit, for hdfs
      conf.set("dfs.block.local-path-access.user", curUser);
      // read short circuit, for hbase
      conf.setBoolean("dfs.client.read.shortcircuit", true);
      // Skip checking checksum, for the hdfs client and the datanode
      conf.setBoolean("dfs.client.read.shortcircuit.skip.checksum", true);
    } else {
      LOG.info("read short circuit is OFF");
    }
  }
Enable the short circuit read, unless configured differently. Set both HBase and HDFS settings,
including skipping the hdfs checksum checks.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/HBaseTestingUtility.java