[jira] Updated: (HDFS-1458) Improve checkpoint performance by avoiding unnecessary image downloads

["Hairong Kuang (JIRA)" <ji...@apache.org>]

     [ 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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