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Date: Wed, 21 Dec 2011 23:21:30 +0000 (UTC)
From: "Zhihong Yu (Commented) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-2698) BackupNode is downloading image from
 NameNode for every checkpoint
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    [ https://issues.apache.org/jira/browse/HDFS-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13174483#comment-13174483 ] 

Zhihong Yu commented on HDFS-2698:
----------------------------------

Patch looks good to me.
                
> BackupNode is downloading image from NameNode for every checkpoint
> ------------------------------------------------------------------
>
>                 Key: HDFS-2698
>                 URL: https://issues.apache.org/jira/browse/HDFS-2698
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>         Attachments: rollFSImage.patch, rollFSImage.patch
>
>
> BackupNode can make periodic checkpoints without downloading image and edits files from the NameNode, but with just saving the namespace to local disks. This is not happening because NN renews checkpoint time after every checkpoint, thus making its image ahead of the BN's even though they are in sync.

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