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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3969) Outdated data can not be cleaned in time
Date Thu, 16 Jun 2011 22:49:47 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13050781#comment-13050781

Ted Yu commented on HBASE-3969:

Compaction code has been rewritten in TRUNK.

For 0.90, PriorityCompactionQueue.addToRegionsInQueue() wouldn't touch a request which was
already in regionsInQueue.
If we record the time when CompactionRequest for a major compaction was put in regionsInQueue,
the above check can be modified to boost the priority of the request after specified amount
of time has elapsed.
Changes in add() method is also required.

> Outdated data can not be cleaned in time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may causing the major compact be delayed for a long time(even a few days),  and outdated data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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