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https://issues.apache.org/jira/browse/MAPREDUCE-7455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18029252#comment-18029252
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ASF GitHub Bot commented on MAPREDUCE-7455:
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github-actions[bot] closed pull request #6093: MAPREDUCE-7455.
org.apache.hadoop.mapred.SpillRecord crashes due to overflow in buffer size
computation
URL: https://github.com/apache/hadoop/pull/6093
> org.apache.hadoop.mapred.SpillRecord crashes due to overflow in buffer size
> computation
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-7455
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-7455
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.3.6
> Reporter: ConfX
> Priority: Major
> Labels: pull-request-available
>
> A large `mapreduce.job.reduces` can cause overflow while computing the byte
> buffer in `org.apache.hadoop.mapred.SpillRecord#SpillRecord(int)`, since the
> byte buffer size equals to `mapreduce.job.reduces` *
> MapTask.MAP_OUTPUT_INDEX_RECORD_LENGTH
> To reproduce:
> 1. set `mapreduce.job.reduces` to 509103844
> 2. run `mvn surefire:test
> -Dtest=org.apache.hadoop.mapred.TestMapTask#testShufflePermissions`
> We create a PR that provides a fix by checking the computed buffer size is
> positive.
>
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