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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8892) should pick the files as older as possible also while hasReferences
Date Tue, 09 Jul 2013 02:17:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13702797#comment-13702797

Sergey Shelukhin commented on HBASE-8892:

Hmm. I actually saw this code in passing and was wondering the other thing.
We want to get rid of references asap, in order to be able to split the region. If so, should
we just ignore the setting and either do major compaction, or at least make sure all references
(and all interleaving files, for correctness) are included
> should pick the files as older as possible also while hasReferences
> -------------------------------------------------------------------
>                 Key: HBASE-8892
>                 URL: https://issues.apache.org/jira/browse/HBASE-8892
>             Project: HBase
>          Issue Type: Bug
>          Components: Compaction
>    Affects Versions: 0.94.9
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>            Priority: Minor
>         Attachments: HBase-8892-0.94.txt
> Currently, while hasReferences for compactSelection, and if compactSelection.getFilesToCompact()
has more than maxFilesToCompact files, we clear the files from beginning, it's different with
the normal minor compaction ratio based policy, which tries to do compactSelection from older
to newer ones as possible.
> {code}
>       } else if (compactSelection.getFilesToCompact().size() > this.maxFilesToCompact)
>         // all files included in this compaction, up to max
>         int pastMax = compactSelection.getFilesToCompact().size() - this.maxFilesToCompact;
>         compactSelection.getFilesToCompact().subList(0, pastMax).clear();
> {code}
> It makes the beginning files more difficult to be picked up in future's minor compaction
> IMHO, it should be like this:
> {code}
>         compactSelection.getFilesToCompact()
>             .subList(this.maxFilesToCompact, compactSelection.getFilesToCompact().size())
>             .clear();
> {code}
> It's not a big issue, since occurs while hasReferences returns true only.

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