cassandra-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9896) Add ability to disable commitlog recycling
Date Mon, 27 Jul 2015 20:08:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14643304#comment-14643304
] 

Brandon Williams commented on CASSANDRA-9896:
---------------------------------------------

Here's a comparison of 1ms with 64 concurrent writes, 2.0.15, and a patch given to me by a
third party that removes the sleep, with a smaller size (1k vs 64k):

http://cstar.datastax.com/graph?stats=761a933c-3498-11e5-b142-42010af0688f&metric=op_rate&operation=1_write&smoothing=1&show_aggregates=true&xmin=0&xmax=34.32&ymin=0&ymax=630.3

That patch performs significantly better, so I'm less certain that disabling the commitlog
recycling is the best solution, but obviously helps.  You can see the patch [here|https://github.com/driftx/cassandra/tree/nosleep]

> Add ability to disable commitlog recycling
> ------------------------------------------
>
>                 Key: CASSANDRA-9896
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9896
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Brandon Williams
>            Assignee: Benedict
>             Fix For: 2.1.x
>
>
> See CASSANDRA-9533 for background, specifically the graphs I linked.  Benedict suggests
this is due the commitlog recycling and I agree, so the simplest solution is to be able to
disable that.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message