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From "Christian Spriegel (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-4153) Optimize truncate when snapshots are disabled or keyspace not durable
Date Sun, 15 Apr 2012 00:55:17 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-4153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christian Spriegel updated CASSANDRA-4153:
------------------------------------------

    Attachment: OptimizeTruncate_v1.diff

Added patch
                
> Optimize truncate when snapshots are disabled or keyspace not durable
> ---------------------------------------------------------------------
>
>                 Key: CASSANDRA-4153
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4153
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Christian Spriegel
>            Priority: Minor
>         Attachments: OptimizeTruncate_v1.diff
>
>
> My goal is to make truncate to be less IO intensive so that my junit tests run faster
(as already explained in CASSANDRA-3710). I think I have now a solution which does not change
too much:
> I created a patch that optimizes three things within truncate:
> - Skip the whole Commitlog.forceNewSegment/discardCompletedSegments, if durable_writes
are disabled for the keyspace.
> - With CASSANDRA-3710 implemented, truncate does not need to flush memtables to disk
when snapshots are disabled.
> - Reduce the sleep interval
> The patch works nicely for me. Applying it and disabling durable_writes/autoSnapshot
increased the speed of my testsuite vastly. I hope I did not overlook something.
> Let me know if my patch needs cleanup. I'd be glad to change it, if it means the patch
will get accepted.

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