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https://issues.apache.org/jira/browse/TEZ-1593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rajesh Balamohan updated TEZ-1593:
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Attachment: TEZ-1593.2.patch
> Refactor PipelinedSorter to remove all MMAP based ByteBuffer references
> -----------------------------------------------------------------------
>
> Key: TEZ-1593
> URL: https://issues.apache.org/jira/browse/TEZ-1593
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.6.0
> Reporter: Gopal V
> Assignee: Gopal V
> Labels: Performance
> Attachments: TEZ-1593.1.patch, TEZ-1593.2-WIP.patch, TEZ-1593.2.patch
>
>
> The current implementation of PipelinedSorter has a slow section which
> revolves around key comparisons - this was relevant when the implementation
> used direct byte buffers to back the kvbuffer.
> {code}
> kvbuffer.position(istart);
> kvbuffer.get(ki, 0, ilen);
> kvbuffer.position(jstart);
> kvbuffer.get(kj, 0, jlen);
> // sort by key
> final int cmp = comparator.compare(ki, 0, ilen, kj, 0, jlen);
> {code}
> The kvbuffer.get into the arrays ki and kj are the slowest part of the
> comparator operation.
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