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https://issues.apache.org/jira/browse/CASSANDRA-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edward Capriolo updated CASSANDRA-4565:
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Attachment: cassandra-4565.patch.1.txt
First attempt at a patch. Test passes, but we will likely refine this later.
> 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
> Attachments: cassandra-4565.patch.1.txt
>
>
> 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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