private void killLauncherChildJobs(Configuration conf, String jobId) throws IOException {
    // Extract the launcher job submit/start time and use that to scope down
    // the search interval when we look for child jobs
    long startTime = getTempletonLaunchTime(conf);
    UserGroupInformation ugi = UserGroupInformation.getCurrentUser();
    WebHCatJTShim tracker = ShimLoader.getHadoopShims().getWebHCatShim(conf, ugi);
    try {
      tracker.killJobs(jobId, startTime);
    } finally {
      tracker.close();
    }
  }
Kills child jobs of this launcher that have been tagged with this job's ID.
hcatalog/webhcat/svr/src/main/java/org/apache/hive/hcatalog/templeton/tool/LaunchMapper.java