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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1378) Edit log replay should track and report file offsets in case of errors
Date Thu, 12 May 2011 00:07:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13032192#comment-13032192
] 

Aaron T. Myers commented on HDFS-1378:
--------------------------------------

Updated patch looks good to me. Thanks for catching that, Todd.

> Edit log replay should track and report file offsets in case of errors
> ----------------------------------------------------------------------
>
>                 Key: HDFS-1378
>                 URL: https://issues.apache.org/jira/browse/HDFS-1378
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Aaron T. Myers
>             Fix For: 0.23.0
>
>         Attachments: hdfs-1378-branch20.txt, hdfs-1378.0.patch, hdfs-1378.1.patch, hdfs-1378.2.txt
>
>
> Occasionally there are bugs or operational mistakes that result in corrupt edit logs
which I end up having to repair by hand. In these cases it would be very handy to have the
error message also print out the file offsets of the last several edit log opcodes so it's
easier to find the right place to edit in the OP_INVALID marker. We could also use this facility
to provide a rough estimate of how far along edit log replay the NN is during startup (handy
when a 2NN has died and replay takes a while)

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