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From "Konstantin Shvachko (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-2698) BackupNode is downloading image from NameNode for every checkpoint
Date Sat, 17 Dec 2011 01:48:30 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Konstantin Shvachko updated HDFS-2698:
--------------------------------------

    Attachment: rollFSImage.patch

One line fix, but important for checkpoint performance.
This is laso mentioned in the [comment|https://issues.apache.org/jira/browse/HDFS-903?focusedCommentId=13036705&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13036705]
for HADOOP-903. 
                
> 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
>
>
> 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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