@Override
  public Set<String> getJobs(String tag, long timestamp) {
    Set<ApplicationId> childYarnJobs = getYarnChildJobs(tag, timestamp);
    Set<String> childJobs = new HashSet<String>();
    for(ApplicationId id : childYarnJobs) {
      // Convert to a MapReduce job id
      String childJobId = TypeConverter.fromYarn(id).toString();
      childJobs.add(childJobId);
    }
    return childJobs;
  }
Returns all jobs tagged with the given tag that have been started after the
given timestamp. Returned jobIds are MapReduce JobIds.
shims/0.23/src/main/java/org/apache/hadoop/mapred/WebHCatJTShim23.java