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From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-1143) unload of METADATA default_tablet with merging minor compactions can lockup
Date Mon, 04 Mar 2013 22:05:13 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592701#comment-13592701
] 

Keith Turner commented on ACCUMULO-1143:
----------------------------------------

I am thinking the best long term solution is to write delete markers for the METADATA table
into the root tablet.  This fix will avoid possible future bugs.  

Not doing merging minor compactions for the metadata table may not involve any code changes.
  Setting table.file.max to a large number for the !METADATA table should disable merging
minor compactions.  Could possibly make init do this.
                
> unload of METADATA default_tablet with merging minor compactions can lockup
> ---------------------------------------------------------------------------
>
>                 Key: ACCUMULO-1143
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1143
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.4.0
>            Reporter: Eric Newton
>            Assignee: Keith Turner
>            Priority: Critical
>             Fix For: 1.5.0, 1.4.3
>
>
> Unloading the default tablet of the !METADATA table can result in a merging minor compaction.
 This results in a delete marker for the unneeded resulting file.  The delete marker goes
into the default tablet of !METADATA.  Which is offline while it performs its final minor
compaction.

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