FAQ
Backupnode downloading image/edits from Namenode at every checkpoint ..
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Key: HDFS-2007
URL: https://issues.apache.org/jira/browse/HDFS-2007
Project: Hadoop HDFS
Issue Type: Bug
Components: name-node
Reporter: Hari
Priority: Minor


After the fix for HDFS-903 ( md5 verification of fsimage ) , Backupnode is downloading the image & edit files from namenode everytime since the difference in checkpoint time is always maintined b/w Namenode and Backupnode .

This happens since Namenode is resetting its checkpoint time after every checkpoint since we are ignoring renewCheckpointTime and passing true explicitly to rollFsimage during endcheckpoint , while Backupnode is setting its checkpointtime to whatever it got from the namenode during startcheckpoint()

Thus , checkpointtimes will be different during the next checkpoint and ll cause the image to be downloaded again ..

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  • SreeHari (Resolved) (JIRA) at Dec 20, 2011 at 5:13 am
    [ https://issues.apache.org/jira/browse/HDFS-2007?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    SreeHari resolved HDFS-2007.
    ----------------------------

    Resolution: Duplicate
    Backupnode downloading image/edits from Namenode at every checkpoint ..
    ------------------------------------------------------------------------

    Key: HDFS-2007
    URL: https://issues.apache.org/jira/browse/HDFS-2007
    Project: Hadoop HDFS
    Issue Type: Bug
    Components: name-node
    Reporter: SreeHari
    Assignee: SreeHari
    Priority: Minor

    After the fix for HDFS-903 ( md5 verification of fsimage ) , Backupnode is downloading the image & edit files from namenode everytime since the difference in checkpoint time is always maintined b/w Namenode and Backupnode .
    This happens since Namenode is resetting its checkpoint time after every checkpoint since we are ignoring renewCheckpointTime and passing true explicitly to rollFsimage during endcheckpoint , while Backupnode is setting its checkpointtime to whatever it got from the namenode during startcheckpoint()
    Thus , checkpointtimes will be different during the next checkpoint and ll cause the image to be downloaded again ..
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postedMay 27, '11 at 10:32a
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