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https://issues.apache.org/jira/browse/HBASE-3969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050754#comment-13050754
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stack commented on HBASE-3969:
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@Ted I don't think will make zhoushuaifeng happy; he wants the major compaction 
to run, not be discarded because it too old.  Or what you thinking?

> Outdated data can not be cleaned in time
> ----------------------------------------
>
>                 Key: HBASE-3969
>                 URL: https://issues.apache.org/jira/browse/HBASE-3969
>             Project: HBase
>          Issue Type: Improvement
>          Components: regionserver
>    Affects Versions: 0.90.1, 0.90.2, 0.90.3
>            Reporter: zhoushuaifeng
>             Fix For: 0.90.4
>
>         Attachments: HBASE-3969-solution1-for-branch.patch, 
> HBASE-3969-solution1.patch
>
>
> Compaction checker will send regions to the compact queue to do compact. But 
> the priority of these regions is too low if these regions have only a few 
> storefiles. When there is large through output, and the compact queue will 
> aways have some regions with higher priority. This may causing the major 
> compact be delayed for a long time(even a few days),  and outdated data 
> cleaning will also be delayed.
> In our test case, we found some regions sent to the queue by major compact 
> checker hunging in the queue for more than 2 days! Some scanners on these 
> regions cannot get availably data for a long time and lease expired.

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