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From "Billy Pearson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-834) Upper bound on files we compact at any one time
Date Sat, 16 Aug 2008 06:33:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-834?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12623090#action_12623090
] 

Billy Pearson commented on HBASE-834:
-------------------------------------

Forgot this patch also includes the max files to compact at one time on a minor compaction
I set the default to 10.

> Upper bound on files we compact at any one time
> -----------------------------------------------
>
>                 Key: HBASE-834
>                 URL: https://issues.apache.org/jira/browse/HBASE-834
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.2.1, 0.3.0
>            Reporter: stack
>            Assignee: Billy Pearson
>            Priority: Minor
>             Fix For: 0.2.1, 0.3.0
>
>
> From Billy in HBASE-64, which we closed because it got pulled all over the place:
> {code}
> Currently we do compaction on a region when the hbase.hstore.compactionThreshold is reached
- default 3
> I thank we should configure a max number of mapfiles to compact at one time simulator
to doing a minor compaction in bigtable. This keep compaction's form getting tied up in one
region to long letting other regions get way to many memcache flushes making compaction take
longer and longer for each region
> If we did that when a regions updates start to slack off the max number will eventuly
include all mapfiles causeing a major compaction on that region. Unlike big table this would
leave the master out of the process and letting the region server handle the major compaction
when it has time.
> When doing a minor compaction on a few files I thank we should compact the newest mapfiles
first leave the larger/older ones for when we have low updates to a region.
> {code}

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