private long getDagStartTime(URL url) throws IOException, AuthenticationException {
      JsonNode rootNode = ThreadContextMR2.readJsonNode(url);
      long startTime = rootNode.path("otherinfo").get("startTime").getLongValue();
      return startTime;
    }
JSONFactory class provides functionality to parse mined job data from timeline server.
app/com/linkedin/drelephant/tez/fetchers/TezFetcher.java