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From "Hari (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-2007) Backupnode downloading image/edits from Namenode at every checkpoint ..
Date Fri, 27 May 2011 10:31:47 GMT
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: 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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