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https://issues.apache.org/jira/browse/HDFS-1839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030458#comment-13030458
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Konstantin Shvachko commented on HDFS-1839:
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BackupNode and Checkpointer are not affected. Only the SecondaryNameNode.
> SecondaryNameNode should not discard "previous.checkpoint"
> ----------------------------------------------------------
>
> Key: HDFS-1839
> URL: https://issues.apache.org/jira/browse/HDFS-1839
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: name-node
> Affects Versions: 0.20.1, 0.20.203.0
> Reporter: Konstantin Shvachko
> Fix For: 0.22.0
>
>
> While creating a checkpoint SNN calls {{moveLastCheckpoint()}} twice. As a
> result directory "previous.checkpoint" is getting removed.
> "previous.checkpoint" directory holds the checkpoint that was created before
> the current one. It is useful for manual recovery, but nothing else.
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