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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-5999) Do not create rollback fsimage when it already exists
Date Sun, 23 Feb 2014 21:36:19 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5999?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao resolved HDFS-5999.
-----------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Thanks Nicholas! I've committed this.

> Do not create rollback fsimage when it already exists
> -----------------------------------------------------
>
>                 Key: HDFS-5999
>                 URL: https://issues.apache.org/jira/browse/HDFS-5999
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: datanode, ha, hdfs-client, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-5999.000.patch
>
>
> Currently in FSEditLogLoader#applyEditLogOp, if the op is OP_START_LOG_SEGMENT, we do
an extra rollback fsimage with condition "totalEdits > 1".
> This may cause some issue when we restart a NN with new software. If there is no extra
checkpoint after the rollback image, the NN may generate a new rollback image using the new
software, and replace the old rollback image. Then later if we want to do rollback the NN,
which uses the old software, may not be able to load the rollback image.



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