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Date: Tue, 9 Apr 2013 21:26:17 +0000 (UTC)
From: "Sergey Shelukhin (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12641492.1365465610458.138550.1365542777400@arcas>
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Subject: [jira] [Commented] (HBASE-8299) ExploringCompactionPolicy can get
 stuck in rare cases.
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    [ https://issues.apache.org/jira/browse/HBASE-8299?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13627133#comment-13627133 ] 

Sergey Shelukhin commented on HBASE-8299:
-----------------------------------------

The compaction is not only requested when it's necessary. There's periodic compaction checker, and there's compaction when region is opened. needsCompaction also doesn't check ratio iirc, so number of files would be enough to call compaction selection. It doesn't mean there must be selection. In such cases with one large file and a few new memstore flush files that are not yet by themselves within the ratio, there must be no compaction.
If something calls selection non-stop when there's no reasonable selection to be made it's a different problem.
                
> ExploringCompactionPolicy can get stuck in rare cases.
> ------------------------------------------------------
>
>                 Key: HBASE-8299
>                 URL: https://issues.apache.org/jira/browse/HBASE-8299
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.1
>            Reporter: Elliott Clark
>            Assignee: Elliott Clark
>         Attachments: HBASE-8299-0.patch
>
>
> If the files are very oddly sized then it's possible that ExploringCompactionPolicy can get stuck.

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