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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5549) Remove Table.switchLock
Date Tue, 28 Jan 2014 16:13:40 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13884283#comment-13884283
] 

Jonathan Ellis commented on CASSANDRA-5549:
-------------------------------------------

(tried to squash only-5549 onto trunk to see if it was something that got fixed recently in
trunk and got a zillion conflicts, so rebasing that would be useful in any case)

> Remove Table.switchLock
> -----------------------
>
>                 Key: CASSANDRA-5549
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5549
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jonathan Ellis
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1
>
>         Attachments: 5549-removed-switchlock.png, 5549-sunnyvale.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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