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https://issues.apache.org/jira/browse/HDFS-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935242#action_12935242
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Hairong Kuang commented on HDFS-1458:
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[exec] +1 overall.
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[exec] +1 @author. The patch does not contain any @author tags.
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[exec] +1 tests included. The patch appears to i
[exec] nclude 3 new or modified tests.
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[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
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[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
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[exec] +1 findbugs. The patch does not introduce any new Findbugs
(version 1.3.9) warnings.
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[exec] +1 release audit. The applied patch does not increase the
total number of release audit warnings.
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[exec] +1 system test framework. The patch passed system test
framework compile.
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> 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: 0.22.0
>
> 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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