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https://issues.apache.org/jira/browse/APEXCORE-330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15267178#comment-15267178
]
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_r61779008
--- Diff: engine/src/main/java/com/datatorrent/stram/util/StackTrace.java
---
@@ -0,0 +1,77 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package com.datatorrent.stram.util;
+
+import java.util.Map;
+
+import org.codehaus.jettison.json.JSONArray;
+import org.codehaus.jettison.json.JSONException;
+import org.codehaus.jettison.json.JSONObject;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class StackTrace
+{
+ private static final Logger LOG =
LoggerFactory.getLogger(StackTrace.class);
+
+ public static String getJsonFormat()
+ {
+ Map<Thread, StackTraceElement[]> stackTraces =
Thread.getAllStackTraces();
+
+ JSONObject jsonObject = new JSONObject();
+ JSONArray jsonArray = new JSONArray();
+
+ int j = 0;
+ 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 (int i = 0; i < elements.getValue().length; ++i) {
+
+ stacks.put(i, elements.getValue()[i].toString());
+ }
+
+ jsonThreads.put("Stacks", stacks);
+
+ jsonArray.put(j++, jsonThreads);
+ } catch (Exception ex) {
+ LOG.warn("Getting stack trace for the thread " + thread.getName()
+ " failed.");
+ continue;
+ }
+ }
+
+ try {
+ jsonObject.put("Threads", jsonArray);
+ } catch (JSONException e) {
+ LOG.error("Getting the stack trace failed with the exception " +
e.toString());
--- End diff --
This should never happen. We should probably just throw a RuntimeException
here.
> 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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