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https://issues.apache.org/jira/browse/HDFS-6934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14185661#comment-14185661
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Tsz Wo Nicholas Sze commented on HDFS-6934:
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+1 the 2.6 patch looks good.
> There was a very slight merge conflict on merging to branch-2.6. ...
In such case, we should cherry-pick the trunk commit and resolve the merge
manually.
> Move checksum computation off the hot path when writing to RAM disk
> -------------------------------------------------------------------
>
> Key: HDFS-6934
> URL: https://issues.apache.org/jira/browse/HDFS-6934
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, hdfs-client
> Reporter: Arpit Agarwal
> Assignee: Chris Nauroth
> Attachments: HDFS-6934-branch-2.6.5.patch, HDFS-6934.3.patch,
> HDFS-6934.4.patch, HDFS-6934.5.patch, h6934_20141003b.patch,
> h6934_20141005.patch
>
>
> Since local RAM is considered reliable we can avoid writing checksums on the
> hot path when replicas are being written to a local RAM disk.
> The checksum can be computed by the lazy writer when moving replicas to disk.
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