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https://issues.apache.org/jira/browse/HDFS-2698?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13171390#comment-13171390
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Konstantin Shvachko commented on HDFS-2698:
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This is because NN calles {{FSImage.rollFSImage()}} with {{renewCheckpoint}}
parameter set to {{true}} unconditionally.
> 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
>
> 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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