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https://issues.apache.org/jira/browse/HDFS-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032501#comment-13032501
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Hairong Kuang commented on HDFS-1458:
-------------------------------------
Todd, you need the fix to HDFS-1627. We already run this and HDFS-1627,
together with image compression for around 2 months on our large cluster. All
seem to pretty stable and have improved NN availability/responsiveness a lot.
> Improve checkpoint performance by avoiding unnecessary image downloads
> ----------------------------------------------------------------------
>
> Key: HDFS-1458
> URL: https://issues.apache.org/jira/browse/HDFS-1458
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: name-node
> Affects Versions: 0.22.0
> Reporter: Hairong Kuang
> Assignee: Hairong Kuang
> Fix For: 0.23.0
>
> Attachments: checkpoint-checkfsimageissame.patch,
> trunkNoDownloadImage.patch, trunkNoDownloadImage1.patch,
> trunkNoDownloadImage2.patch, trunkNoDownloadImage3.patch
>
>
> If secondary namenode could verify that the image it has on its disk is the
> same as the one in the primary NameNode, it could skip downloading the image
> from the primary NN, thus completely eliminating the image download overhead.
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