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From "Kannan Muthukkaruppan (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2453) Revisit compaction policies after HBASE-2248 commit
Date Fri, 16 Apr 2010 22:13:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12858030#action_12858030

Kannan Muthukkaruppan commented on HBASE-2453:

Not totally convinced about this. If your workload is IO bound, processing the deletes more
aggressively (i.e. during minor compactions) even if it meant some extra CPU might be good

Can we atleast make this a configurable option? We should do some numbers to see what the
savings of not doing delete processing are.

> Revisit compaction policies after HBASE-2248 commit
> ---------------------------------------------------
>                 Key: HBASE-2453
>                 URL: https://issues.apache.org/jira/browse/HBASE-2453
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: Jonathan Gray
>            Assignee: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.20.4, 0.20.5, 0.21.0
>         Attachments: HBASE-2453-v1.patch
> HBASE-2248 turned Gets into Scans server-side.  It also removed the invariant that deletes
in a file only apply to other files and not itself (no longer processes MemStore deletes when
the delete happens).  This has implications for our minor compaction policy.
> We are currently processing deletes during minor compactions in a way that makes it so
we do the actual deleting as we compact, but we retain the delete records themselves.  This
makes it so we retain the invariant of deletes only applying to other files.
> Since this is now gone post HBASE-2248, we should revisit our compaction policies.

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