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https://issues.apache.org/jira/browse/YARN-11823?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18058172#comment-18058172
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ASF GitHub Bot commented on YARN-11823:
---------------------------------------
K0K0V0K commented on code in PR #8123:
URL: https://github.com/apache/hadoop/pull/8123#discussion_r2799586567
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/DiagnosticJStackService.java:
##########
@@ -0,0 +1,134 @@
+/** * 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 org.apache.hadoop.yarn.server.nodemanager.webapp;
+
+import org.apache.hadoop.util.Shell;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class DiagnosticJStackService {
+
+ private static final Logger LOG = LoggerFactory
+ .getLogger(DiagnosticJStackService.class);
+
+ public static String collectNodeThreadDump(int numberOfJStack)
+ throws Exception {
+ if (Shell.WINDOWS) {
+ throw new UnsupportedOperationException("Not implemented for
Windows");
+ }
+
+ List<String> nodeManagerPids = getNodeManagerPids();
+
+ return runJStack(nodeManagerPids, numberOfJStack);
+
+ }
+
+
+
+ public static String collectApplicationThreadDump(String appId, int
numberOfJStack)
+ throws Exception {
+ if (Shell.WINDOWS) {
+ throw new UnsupportedOperationException("Not implemented for
Windows.");
+ }
+ List<String> applicationPids = getApplicationPids(appId);
+
+ return runJStack(applicationPids, numberOfJStack);
+ }
+
+
+ public static List<String> getNodeManagerPids() throws IOException {
+ Shell.ShellCommandExecutor cmd = new Shell.ShellCommandExecutor(
+ new String[]{
+ "bash",
+ "-c",
+ "ps aux | grep nodemanager | grep -v grep"
Review Comment:
what if someone use a monitor process in the node and it has a
org.apache.hadoop.yarn.server.nodemanager.NodeManager parameter?
why dont you ask from java what is the current process id?
something like
```
long pid = ProcessHandle.current().pid();
System.out.println("PID: " + pid);
```
> New JStack endpoint for running containers and nodes
> ----------------------------------------------------
>
> Key: YARN-11823
> URL: https://issues.apache.org/jira/browse/YARN-11823
> Project: Hadoop YARN
> Issue Type: New Feature
> Components: yarn
> Reporter: chhinlinghean
> Assignee: chhinlinghean
> Priority: Major
> Labels: pull-request-available
>
> Getting jstack for container is not trivial to most people. This new endpoint
> aims to streamline the process of getting jstack of running containers and
> nodes. It mainly use in the DiagnosticCollector script.
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