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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-6943) very contentious writes result in performance degradation
Date Fri, 28 Mar 2014 13:39:14 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-6943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benedict updated CASSANDRA-6943:
--------------------------------

    Attachment: 6943.2.txt

Attaching patch with fix and improved tests (both long test now triggers this, and a specific
unit test)

> very contentious writes result in performance degradation
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-6943
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6943
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Russ Hatch
>         Attachments: 6943.2.txt, 6943.txt, node4.log, node4_jstack.log, node5.log, node5_jstack.log,
node6.log, node6_jstack.log, node7.log, node7_jstack.log, screenshot.png, screenshot2.png,
stress_jstack.log
>
>
> Running performance scenarios I have seen this characteristic drop in performance happen
several times. A similar effect was reproduced in another test cluster. Operations eventually
come to a standstill.
> !screenshot.png!
> !screenshot2.png!



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