[jira] [Reopened] (HDFS-1378) Edit log replay should track and report file offsets in case of errors

["Colin Patrick McCabe (Reopened) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-1378?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Colin Patrick McCabe reopened HDFS-1378:
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      Assignee: Colin Patrick McCabe  (was: Aaron T. Myers)

I'd like to port this to branch-1 so that we can have better error messages there.  It should be a trivial port.  Any objections?
                
> 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: Colin Patrick McCabe
>             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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