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https://issues.apache.org/jira/browse/HBASE-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13563031#comment-13563031
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Andrew Purtell commented on HBASE-7672:
---------------------------------------
I tried something similar once that instead changed the compaction request
comparator to only consider region and priority. It worked, but the large
compaction queues were a symptom of a problem not the problem itself. Decided
to tackle the problem instead.
> Merging compaction requests in the queue for same store
> -------------------------------------------------------
>
> Key: HBASE-7672
> URL: https://issues.apache.org/jira/browse/HBASE-7672
> Project: HBase
> Issue Type: Improvement
> Components: Compaction
> Affects Versions: 0.94.4
> Reporter: chunhui shen
> Assignee: chunhui shen
> Fix For: 0.96.0
>
> Attachments: HBASE-7672.patch
>
>
> With a high write presesure, we could found many compaction requests for same
> store in the compaction queue.
> I think we could merge compaction requests for same store to increase
> compaction efficiency greately. It is so in 0.90 version because doing
> compacting files selection only when executing compaction
> e.g.
> {code}
> SmallCompation active count:1,Queue:
> regionName=abctest,90F9AUIPK4YO47W55WS4R8RSKGDFNRYBNB79COYKHNQD9F62G7,1359104485823.f05568c159940b8a72bd84c988388ad3.,
> storeName=c1, fileCount=4, fileSize=371.1m (212.0m, 53.0m, 53.0m, 53.0m),
> priority=15, time=56843340270506608
> regionName=abctest,90F9AUIPK4YO47W55WS4R8RSKGDFNRYBNB79COYKHNQD9F62G7,1359104485823.f05568c159940b8a72bd84c988388ad3.,
> storeName=c1, fileCount=4, fileSize=330.4m (171.3m, 53.0m, 53.0m, 53.0m),
> priority=11, time=56843401092063608
> {code}
> We could merge these two compaction requests
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