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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1458) Improve checkpoint performance by avoiding uncessary image downloads
Date Thu, 28 Oct 2010 05:34:07 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12925697#action_12925697
] 

Hairong Kuang commented on HDFS-1458:
-------------------------------------

When discussing this with Dhruba, I realized that the secondary does not need to load the
image if the primary and the secondary have the same image. This will give yet another boost
on checkpoint performance.

> Improve checkpoint performance by avoiding uncessary 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
>
>
> 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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