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Date: Mon, 20 Aug 2012 04:15:38 +1100 (NCT)
From: "Ionut Ignatescu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <448347319.28242.1345396538066.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (HBASE-6613) Automatically merge empty regions
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Ionut Ignatescu created HBASE-6613:
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             Summary: Automatically merge empty regions
                 Key: HBASE-6613
                 URL: https://issues.apache.org/jira/browse/HBASE-6613
             Project: HBase
          Issue Type: New Feature
          Components: master, regionserver, util
    Affects Versions: 0.94.1
            Reporter: Ionut Ignatescu


Consider an usecase where row keys has an increasing value(time-series data for example) and data retention is set to a concrete value(60 days for example).
After a period of time, longer than retention, empty regions will appear. This will cause high memory use on region servers.
In my opinion, regions merge could be part of major compaction or another tool should be provided. From my understading, it is possible to merge 2 empty regions without make table offline, but it's not possible to merge one empty region with a non-empty region without close/unassing this regions.

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