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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2770) Support Local WAL Recovery in 1.6
Date Fri, 02 May 2014 18:25:15 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13988047#comment-13988047
] 

Mike Drob commented on ACCUMULO-2770:
-------------------------------------

Since we have no way to roll back an upgrade, it would be nice to have a separate utility
to enable manual recovery of the WALs.

> Support Local WAL Recovery in 1.6
> ---------------------------------
>
>                 Key: ACCUMULO-2770
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2770
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: logger
>    Affects Versions: 1.6.0
>            Reporter: Mike Drob
>            Assignee: Mike Drob
>
> I had a user testing an upgrade from 1.4.5 to 1.6.0 (via 1.5.1) and they ended up with
some unrecoverable data.
> Not all of the WALs got copied from local directories to HDFS, and this was not noticed
during the 1.4 to 1.5 upgrade (possibly due to the presence of offline tables, but we're not
sure). After continuing the upgrade to 1.6, and bringing some of the tables back online, we
discovered that we were missing WALs and could not recover them. We found them on local disks.



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