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From David Medinets <david.medin...@gmail.com>
Subject Re: [jira] [Resolved] (ACCUMULO-58) Misconfigured aggregator can block table deletion
Date Tue, 29 May 2012 23:02:55 GMT
Could Accumulo be self-healing by automatically removing an iterator
that throws an exception? Something to think about.

On Tue, May 29, 2012 at 5:42 PM, Keith Turner (JIRA) <jira@apache.org> wrote:
>
>     [ https://issues.apache.org/jira/browse/ACCUMULO-58?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
>
> Keith Turner resolved ACCUMULO-58.
> ----------------------------------
>
>    Resolution: Fixed
>
>> Misconfigured aggregator can block table deletion
>> -------------------------------------------------
>>
>>                 Key: ACCUMULO-58
>>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-58
>>             Project: Accumulo
>>          Issue Type: Bug
>>          Components: tserver
>>    Affects Versions: 1.4.0, 1.3.5
>>            Reporter: John Vines
>>            Assignee: Keith Turner
>>              Labels: delete, regression
>>             Fix For: 1.5.0
>>
>>
>> If you misconfigure an aggregator such that it can't be loaded, it will cause a tablet
to indefinitely attempt to minor/major compact. If you attempt to delete the table with this
problem the tablet will never break out of the compaction attempt to a point where it will
detect it needs to delete. The only way to break out of the loop is kill any tservers who
are hosting tablets attempts to be compacted. This definately exists in 1.3, fairly confident
it affects the other versions as well. We would need to have the compaction loops check somehow
to detect if the tablet needs to be deleted before reattempting.
>> Additionally, a functional test should be written to exercise this error to prevent
regression.
>
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