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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1410) compactions are not memory efficient
Date Thu, 04 Jun 2009 04:32:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12716150#action_12716150
] 

Billy Pearson commented on HBASE-1410:
--------------------------------------

I am seeing compactions OOME'ing my servers with a 512MB region size setting and compression
turned on with a 1GB heap
(re)deployed on each region server and killed the whole cluster one by one.

> compactions are not memory efficient 
> -------------------------------------
>
>                 Key: HBASE-1410
>                 URL: https://issues.apache.org/jira/browse/HBASE-1410
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>             Fix For: 0.20.0
>
>
> Compactions read a lot of data into the heap. Prior to HBASE-1058 or successor issues,
it was possible to stack up hundreds if not thousands of flushes in a store. Eventually when
compaction is possible, no HRS has enough heap to commit for the compaction process and all
OOME as the region in question is (re)deployed. HBASE-1058 is not the ideal solution.This
issue suggests creating a memory efficient compaction process which can scale. 

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