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From "Edward Capriolo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-4565) TTL columns with older then gcgrace do not need to flush
Date Tue, 21 Aug 2012 23:46:38 GMT
Edward Capriolo created CASSANDRA-4565:
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             Summary: TTL columns with older then gcgrace do not need to flush
                 Key: CASSANDRA-4565
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4565
             Project: Cassandra
          Issue Type: Improvement
            Reporter: Edward Capriolo
            Assignee: Edward Capriolo


With memcache many people are willing to sacrifice durability for performance. Cassandra has
a TimeToLive feature that can be used in caching scenarios with low values for gc_grace_seconds.
However from a code dive it seems that cassandra will always write TTL to disk, even those
that are beyond gc_grace_seconds. If a user very large memtables,small ttl, and low gc_grace
it is possible that writing memtables can be skipped entirely in some scenarios.

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