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https://issues.apache.org/jira/browse/HDFS-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122737#comment-14122737
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Steve Loughran commented on HDFS-3528:
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This appears to have has broken all hadoop 2.2 applications on a hadoop 2.6
cluster ... filed HADOOP-11064 to highlight this
> Use native CRC32 in DFS write path
> ----------------------------------
>
> Key: HDFS-3528
> URL: https://issues.apache.org/jira/browse/HDFS-3528
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode, hdfs-client, performance
> Affects Versions: 2.0.0-alpha
> Reporter: Todd Lipcon
> Assignee: James Thomas
> Fix For: 2.6.0
>
>
> HDFS-2080 improved the CPU efficiency of the read path by using native
> SSE-enabled code for CRC verification. Benchmarks of the write path show that
> it's often CPU bound by checksums as well, so we should make the same
> improvement there.
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