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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1410) compactions are not memory efficient
Date Sun, 14 Jun 2009 10:34:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12719244#action_12719244

ryan rawson commented on HBASE-1410:

I just compacted 109 files, totaling 2.1gb in my system.  Compactions on that HRS was broken
due to the HDFS client bug, so the small files piled up for a long time.

So this probably is probably seriously fixed in 0.20.


> 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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