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https://issues.apache.org/jira/browse/MAPREDUCE-7178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16752938#comment-16752938
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Hadoop QA commented on MAPREDUCE-7178:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 5s{color}
| {color:red} MAPREDUCE-7178 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Issue | MAPREDUCE-7178 |
| Console output |
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/7575/console |
| Powered by | Apache Yetus 0.8.0 http://yetus.apache.org |
This message was automatically generated.
> NPE while YarnChild shudown
> ---------------------------
>
> Key: MAPREDUCE-7178
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7178
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: lujie
> Priority: Major
> Attachments: MR-7178_1.patch, yarnchild.log
>
>
> In YarnChild.main
> {code:java}
> try{
> logSyncer = TaskLog.createLogSyncer();//line 168
> ....
> taskFinal.run(job, umbilical); //line 178
> }catch (Exception exception) {//line 187
> LOG.warn("Exception running child : "
> + StringUtils.stringifyException(exception));
> .................
> task.taskCleanup(umbilical);// line 200
> }{code}
> At line 178. it will initialize the task.committer, but the line168 may throw
> exception, it will skip initialize the task.committer, hence task.committer
> == null. Line 187 will catch this exception and do clean up(line 200), code
> line 200 will use task.committer without null check, hence NPE happens
> {code:java}
> 2019-01-23 16:59:42,864 INFO [main] org.apache.hadoop.mapred.YarnChild:
> Exception cleaning up: java.lang.NullPointerException
> at org.apache.hadoop.mapred.Task.taskCleanup(Task.java:1458)
> at org.apache.hadoop.mapred.YarnChild$3.run(YarnChild.java:200)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:422)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1876)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:197)
> {code}
> So why line168 may throw exception, below log give a example:
> {code:java}
> 2019-01-23 16:59:42,857 WARN [main] org.apache.hadoop.mapred.YarnChild:
> Exception running child : java.lang.IllegalStateException: Shutdown in
> progress, cannot add a shutdownHook
> at
> org.apache.hadoop.util.ShutdownHookManager.addShutdownHook(ShutdownHookManager.java:299)
> at org.apache.hadoop.mapred.TaskLog.createLogSyncer(TaskLog.java:340)
> at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:168){code}
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