private long getSubmitTime(URL url) throws IOException, AuthenticationException {
      JsonNode rootNode = ThreadContextMR2.readJsonNode(url);
      return rootNode.path("job").path("submitTime").getValueAsLong();
    }
This class implements the Fetcher for MapReduce Applications on Hadoop2
app/com/linkedin/drelephant/mapreduce/fetchers/MapReduceFetcherHadoop2.java