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https://issues.apache.org/jira/browse/TEZ-3757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047000#comment-16047000
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Siddharth Seth commented on TEZ-3757:
-------------------------------------
cc [~gopalv], [~rajesh.balamohan]
> Integer overflow in PipelinedSorter
> -----------------------------------
>
> Key: TEZ-3757
> URL: https://issues.apache.org/jira/browse/TEZ-3757
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.8.4, 0.8.5
> Reporter: Travis Woodruff
>
> This code in {{PipelinedSorter.sort()}} passes {{(1024*1024)}} as maxItems to
> the {{SortSpan}} constructor:
> {code}
> //TODO: fix per item being passed.
> span = new SortSpan((ByteBuffer)buffers.get(bufferIndex).clear(),
> (1024*1024),
> perItem, ConfigUtils.getIntermediateOutputKeyComparator(this.conf));
> {code}
> {{SortSpan}}'s constructor then calculates {{dataSize}} as follows:
> {code}
> int dataSize = maxItems * perItem;
> {code}
> This means that if {{perItem}} is >= 2048, {{dataSize}} overflows, which
> (usually?) ends up causing the capacity check to not work correctly, which
> causes subsequent buffer operations to fail.
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