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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2636) [hbase] Make flusher less dumb
Date Thu, 17 Jan 2008 06:36:34 GMT
[hbase] Make flusher less dumb
------------------------------

                 Key: HADOOP-2636
                 URL: https://issues.apache.org/jira/browse/HADOOP-2636
             Project: Hadoop
          Issue Type: Improvement
          Components: contrib/hbase
            Reporter: stack
            Priority: Minor


When flusher runs -- its triggered when the sum of all Stores in a Region > a configurable
max size -- we flush all Stores though a Store memcache might have but a few bytes.

I would think Stores should only dump their memcache disk if they have some substance.

The problem becomes more acute, the more families you have in a Region.

Possible behaviors would be to dump the biggest Store only, or only those Stores > 50%
of max memcache size.  Behavior would vary dependent on the prompt that provoked the flush.
 Would also log why the flush is running: optional or > max size.

This issue comes out of HADOOP-2621.



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