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https://issues.apache.org/jira/browse/CASSANDRA-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750184#comment-13750184
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Ryan McGuire commented on CASSANDRA-5549:
-----------------------------------------
[~jbellis] I ran a benchmark against your branch comparing it to the prior
commit. I didn't see any difference in write performance:
!5549-removed-switchlock.png!
[Data for this benchmark
here|http://ryanmcguire.info/ds/graph/graph.html?stats=stats.removed_switchlock.json&metric=interval_op_rate&operation=stress-write&smoothing=1]
> Remove Table.switchLock
> -----------------------
>
> Key: CASSANDRA-5549
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5549
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jonathan Ellis
> Fix For: 2.1
>
> Attachments: 5549-removed-switchlock.png
>
>
> As discussed in CASSANDRA-5422, Table.switchLock is a bottleneck on the write
> path. ReentrantReadWriteLock is not lightweight, even if there is no
> contention per se between readers and writers of the lock (in Cassandra,
> memtable updates and switches).
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