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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2093) 1073: Handle case where an entirely empty log is left during NN crash
Date Fri, 24 Jun 2011 23:12:48 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13054739#comment-13054739
] 

Eli Collins commented on HDFS-2093:
-----------------------------------

Thanks for the explanation, makes sense.  +1 to the updated patch.

> 1073: Handle case where an entirely empty log is left during NN crash
> ---------------------------------------------------------------------
>
>                 Key: HDFS-2093
>                 URL: https://issues.apache.org/jira/browse/HDFS-2093
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>    Affects Versions: Edit log branch (HDFS-1073)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: Edit log branch (HDFS-1073)
>
>         Attachments: hdfs-2093.txt, hdfs-2093.txt, hdfs-2093.txt, hdfs-2093.txt
>
>
> In fault-testing the HDFS-1073 branch, I saw the following situation:
> - NN has two storage directories, but one is in failed state
> - NN starts to roll edits logs to edits_inprogress_5160285
> - NN then crashes
> - on restart, it detects the truncated log, but since it has 0 txns, it finalizes it
to the nonsense log name edits_5160285-5160284.
> - It then starts logs again at edits_inprogress_5160285.
> - After this point, no checkpoints or future NN startups succeed since there are two
logs starting with the same txid

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