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Date: Wed, 24 Nov 2010 02:09:17 -0500 (EST)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1458) Improve checkpoint performance by
 avoiding unnecessary image downloads
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     [ https://issues.apache.org/jira/browse/HDFS-1458?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang updated HDFS-1458:
--------------------------------

    Attachment: trunkNoDownloadImage2.patch

This patch made minor change on unit test.

> 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
>
>
> 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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