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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1011) Keep data in Memcache until specified TTL or memory pressure
Date Wed, 19 Nov 2008 20:46:44 GMT
Keep data in Memcache until specified TTL or memory pressure
------------------------------------------------------------

                 Key: HBASE-1011
                 URL: https://issues.apache.org/jira/browse/HBASE-1011
             Project: Hadoop HBase
          Issue Type: New Feature
            Reporter: Jonathan Gray
             Fix For: 0.20.0


In thinking about ways to improve random-read access, a very typical access pattern for web
sites is to primarily be retrieving from new records but having a much larger total dataset
in a given table.

If you could specify a Memcache flush TTL, you could keep "past 24 hours" in memory and this
would give you a sliding window updated on memcache flushes.  Must also adapt to regionserver
memory pressure.

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