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From "Aaron T. Myers (Resolved) (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HDFS-2766) HA: test for case where standby partially reads log and then performs checkpoint
Date Wed, 11 Jan 2012 08:26:51 GMT

     [ https://issues.apache.org/jira/browse/HDFS-2766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aaron T. Myers resolved HDFS-2766.
----------------------------------

      Resolution: Fixed
    Hadoop Flags: Reviewed

Thanks a lot for the review, Todd. I've just committed this.
                
> HA: test for case where standby partially reads log and then performs checkpoint
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-2766
>                 URL: https://issues.apache.org/jira/browse/HDFS-2766
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, name-node
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-2766-HDFS-1623.patch, HDFS-2766-HDFS-1623.patch
>
>
> Here's a potential bug case that we don't currently test for:
> - SBN is reading a finalized edits file when NFS disappears halfway through (or some
intermittent error happens)
> - SBN performs a checkpoint and uploads it to the NN
> - NN receives a checkpoint that doesn't correspond to the end of any log segment
> - Both NN and SBN should be able to restart at this point.

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