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From "zhoushuaifeng (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3521) region be merged with others automatically when all data in the region has expired and removed, or region gets too small.
Date Thu, 10 Feb 2011 08:39:57 GMT
region be merged with others automatically when all data in the region has expired and removed,
or region gets too small.
-------------------------------------------------------------------------------------------------------------------------

                 Key: HBASE-3521
                 URL: https://issues.apache.org/jira/browse/HBASE-3521
             Project: HBase
          Issue Type: Improvement
          Components: master, regionserver, scripts
    Affects Versions: 0.90.0
            Reporter: zhoushuaifeng
            Priority: Minor


We have test a cluster which have more than 30,000 regions, max size of a region is 512MB.
At this situation, data no more growing, but remove some old data and insert new, and regions
will be more and more. And some regions may be very small or empty. This occupies too much
heapsize, and will be more if regions cannot be merged. This will limit hbase running for
a long time. 
A script that does a survey to remove empty regions, or pick out adjacent small regions that
then does the online merge up seems like it would be useful. 

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