FAQ
BackupNode is downloading image from NameNode for every checkpoint
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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


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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  • Konstantin Shvachko (Resolved) (JIRA) at Dec 28, 2011 at 10:31 pm
    [ https://issues.apache.org/jira/browse/HDFS-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Konstantin Shvachko resolved HDFS-2698.
    ---------------------------------------

    Resolution: Fixed
    Fix Version/s: 0.22.1
    Hadoop Flags: Reviewed

    I just committed this to branch 0.22
    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
    Fix For: 0.22.1

    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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