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From "Lu Yilei (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1458) Improve checkpoint performance by avoiding uncessary image downloads
Date Fri, 15 Oct 2010 05:44:32 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lu Yilei updated HDFS-1458:
---------------------------

    Attachment: checkpoint-checkfsimageissame.patch

Check NameNode fsimage and SecondaryNameNode when download CheckpointFiles by RPC, if they
are the same, SecondaryNameNode will not download the fsimage from the NameNode. 

> 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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