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https://issues.apache.org/jira/browse/MAPREDUCE-6715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15783953#comment-15783953
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Daniel Templeton commented on MAPREDUCE-6715:
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Thanks, [~yufeigu]. Some comments:
* In {{CleanupQueue}}, you're missing a space in the text at the line break
* In {{ShuffleSchedulerImpl}}, the {{LOG.debug()}} should be in a conditional
* In {{MapTask}} if you return {{null}}, you're going to cause NPEs
> Fix Bad Practices
> -----------------
>
> Key: MAPREDUCE-6715
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-6715
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.9.0
> Reporter: Yufei Gu
> Assignee: Yufei Gu
> Attachments: MAPREDUCE-6715.001.patch, MAPREDUCE-6715.002.patch
>
>
> {code}
> Null Dereference CleanupQueue.java:139
> Weak SecurityManager Check: Overridable Method
> LocalDistributedCacheManager.java:229
> Null Dereference TextOutputFormat.java:137
> Null Dereference ShuffleSchedulerImpl.java:422
> Null Dereference MapTask.java:415
> Null Dereference Pentomino.java:160
> Unreleased Resource: Streams TeraScheduler.java:77
> Unreleased Resource: Streams CLI.java:570
> Null Dereference CLI.java:370
> {code}
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