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https://issues.apache.org/jira/browse/HADOOP-10674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14039094#comment-14039094
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Tsz Wo Nicholas Sze commented on HADOOP-10674:
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The failure of TestMetricsSystemImpl is not related; see HADOOP-10062.
> Rewrite the PureJavaCrc32 loop for performance improvement
> ----------------------------------------------------------
>
> Key: HADOOP-10674
> URL: https://issues.apache.org/jira/browse/HADOOP-10674
> Project: Hadoop Common
> Issue Type: Improvement
> Components: performance, util
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Attachments: c10674_20140609.patch, c10674_20140609b.patch,
> c10674_20140610.patch, c10674_20140612.patch, c10674_20140619.patch
>
>
> Below are some performance improvement opportunities performance improvement
> in PureJavaCrc32.
> - eliminate "off += 8; len -= 8;"
> - replace T8_x_start with hard coded constants
> - eliminate c0 - c7 local variables
> In my machine, there are 30% to 50% improvement for most of the cases.
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