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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1839) SecondaryNameNode should not discard "previous.checkpoint"
Date Tue, 03 May 2011 17:05:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1839?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028314#comment-13028314
] 

Konstantin Shvachko commented on HDFS-1839:
-------------------------------------------

This is a low priority for both 0.22 and 0.23 as a Checkpointer should be used instead of
SNN. But if we need to patch 0.20, then we will have to go all the way from trunk.

> 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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