[jira] [Created] (YARN-9839) NodeManager java.lang.OutOfMemoryError unable to create new native thread

["Chandni Singh (Jira)" <ji...@apache.org>]

Chandni Singh created YARN-9839:
-----------------------------------

             Summary: NodeManager java.lang.OutOfMemoryError unable to create new native thread
                 Key: YARN-9839
                 URL: https://issues.apache.org/jira/browse/YARN-9839
             Project: Hadoop YARN
          Issue Type: Bug
            Reporter: Chandni Singh
            Assignee: Chandni Singh


NM fails with the below error even though the ulimit for NM is large.

{code}
2019-09-12 10:27:46,348 ERROR org.apache.hadoop.util.Shell: Caught java.lang.OutOfMemoryError: unable to create new native thread. One possible reason is that ulimit setting of 'max user processes' is too low. If so, do 'ulimit -u <largerNum>' and try again.
2019-09-12 10:27:46,348 FATAL org.apache.hadoop.yarn.YarnUncaughtExceptionHandler: Thread Thread[LocalizerRunner for container_e95_1568242982456_152026_01_000132,5,main] threw an Error.  Shutting down now...
java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:717)
        at org.apache.hadoop.util.Shell.runCommand(Shell.java:562)
        at org.apache.hadoop.util.Shell.run(Shell.java:482)
        at org.apache.hadoop.util.Shell$ShellCommandExecutor.execute(Shell.java:776)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:869)
        at org.apache.hadoop.util.Shell.execCommand(Shell.java:852)
        at org.apache.hadoop.fs.FileUtil.execCommand(FileUtil.java:1097)
        at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.loadPermissionInfo(RawLocalFileSystem.java:659)
        at org.apache.hadoop.fs.RawLocalFileSystem$DeprecatedRawLocalFileStatus.getPermission(RawLocalFileSystem.java:634)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService.checkLocalDir(ResourceLocalizationService.java:1441)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService.getInitializedLocalDirs(ResourceLocalizationService.java:1405)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService.access$800(ResourceLocalizationService.java:140)
        at org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ResourceLocalizationService$LocalizerRunner.run(ResourceLocalizationService.java:1114)
{code}

For each container localization request, there is a {{LocalizerRunner}} thread created and each {{LocalizerRunner}} creates another thread to get file permission info which is where we see this failure from. It is in Shell.java -> {{runCommand()}}

{code}
    Thread errThread = new Thread() {
      @Override
      public void run() {
        try {
          String line = errReader.readLine();
          while((line != null) && !isInterrupted()) {
            errMsg.append(line);
            errMsg.append(System.getProperty("line.separator"));
            line = errReader.readLine();
          }
        } catch(IOException ioe) {
          LOG.warn("Error reading the error stream", ioe);
        }
      }
    };
{code}

{{LocalizerRunner}} are Threads which are cached in {{ResourceLocalizationService}}. Looking into a possibility if they are not getting removed from the cache.







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