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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1458) Improve checkpoint performance by avoiding unnecessary image downloads
Date Tue, 09 Nov 2010 22:28:24 GMT

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

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

    Attachment: trunkNoDownloadImage.patch

This patch does the proposed optimization. If the image checksum at seondary NameNode is the
same as the one at primary Namenode, the secondary neither download the image from the primary
nor load the image from disk.

> 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
>
>
> 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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