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