[
https://issues.apache.org/jira/browse/CASSANDRA-5549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13864173#comment-13864173
]
Benedict commented on CASSANDRA-5549:
-------------------------------------
I just realised there was a fairly glaring bug with Flush/PostFlush. I was
'optimising' the path to discard CL segments when there were no 2is, but this
was dangerous because of potential reordering of flushes (so a later flush
could mark CLS unused when an earlier flush was still in progress). I've fixed
and uploaded.
> 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).
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
