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Date: Mon, 2 May 2016 23:52:13 +0000 (UTC)
From: "ASF GitHub Bot (JIRA)" <jira@apache.org>
To: dev@apex.incubator.apache.org
Message-ID: <JIRA.12936622.1454566910000.91872.1462233133118@Atlassian.JIRA>
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Subject: [jira] [Commented] (APEXCORE-330) Ability to obtain a thread dump
 from a container
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archived-at: Mon, 02 May 2016 23:52:19 -0000


    [ https://issues.apache.org/jira/browse/APEXCORE-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267758#comment-15267758 ] 

ASF GitHub Bot commented on APEXCORE-330:
-----------------------------------------

Github user davidyan74 commented on a diff in the pull request:

    https://github.com/apache/incubator-apex-core/pull/321#discussion_r61823831
  
    --- Diff: engine/src/main/java/com/datatorrent/stram/StramUtils.java ---
    @@ -81,4 +89,48 @@
         }
       }
     
    +  public static JSONObject getJsonFormat()
    +  {
    +    Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();
    +
    +    JSONObject jsonObject = new JSONObject();
    +    JSONArray jsonArray = new JSONArray();
    +
    +    for (Map.Entry<Thread,StackTraceElement[]> elements : stackTraces.entrySet()) {
    +
    +      JSONObject jsonThreads = new JSONObject();
    +
    +      Thread thread = elements.getKey();
    +
    +      try {
    +
    +        jsonThreads.put("name", thread.getName());
    +        jsonThreads.put("state", thread.getState());
    +        jsonThreads.put("id", thread.getId());
    +
    +        JSONArray stacks = new JSONArray();
    +
    +        for ( StackTraceElement stackTraceElement: elements.getValue()) {
    +
    +          stacks.put(stackTraceElement.toString());
    +        }
    +
    +        jsonThreads.put("stackTraceElement", stacks);
    +
    +        jsonArray.put(jsonThreads);
    +      } catch (Exception ex) {
    +        LOG.warn("Getting stack trace for the thread " + thread.getName() + " failed.");
    +        continue;
    +      }
    +    }
    +
    +    try {
    +      jsonObject.put("threads", jsonArray);
    +    } catch (JSONException e) {
    +      throw new RuntimeException(e.toString());
    --- End diff --
    
    new RuntimeException(e)


> Ability to obtain a thread dump from a container
> ------------------------------------------------
>
>                 Key: APEXCORE-330
>                 URL: https://issues.apache.org/jira/browse/APEXCORE-330
>             Project: Apache Apex Core
>          Issue Type: Improvement
>            Reporter: Thomas Weise
>            Assignee: Sandesh
>
> To analyze issues such as "stuck operator", it is useful to obtain stats from the running JVM. Often needed are GC stats and thread dump. In production environments users often don't have direct access to the machines, making it available through the REST API will help.


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