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From "Yiqun Lin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-10658) Reduce JsonFactory instance allocation in StartupProgressServlet
Date Wed, 20 Jul 2016 12:07:21 GMT
Yiqun Lin created HDFS-10658:
--------------------------------

             Summary: Reduce JsonFactory instance allocation in StartupProgressServlet
                 Key: HDFS-10658
                 URL: https://issues.apache.org/jira/browse/HDFS-10658
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Yiqun Lin
            Assignee: Yiqun Lin


Now in class {{StartupProgressServlet}}, it will always create a new {{JsonFactory}} instance
to create a JsonGenerator. The codes:
{code}
  protected void doGet(HttpServletRequest req, HttpServletResponse resp)
      throws IOException {
    resp.setContentType("application/json; charset=UTF-8");
    StartupProgress prog = NameNodeHttpServer.getStartupProgressFromContext(
      getServletContext());
    StartupProgressView view = prog.createView();
    JsonGenerator json = new JsonFactory().createJsonGenerator(resp.getWriter());
    try {
      json.writeStartObject();
      json.writeNumberField(ELAPSED_TIME, view.getElapsedTime());
      json.writeNumberField(PERCENT_COMPLETE, view.getPercentComplete());
      json.writeArrayFieldStart(PHASES);
      ...
{code}
We can reuse the instance and reduce {{JsonFactory instance}} allocation.



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