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https://issues.apache.org/jira/browse/CASSANDRA-9607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14596022#comment-14596022
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Robbie Strickland commented on CASSANDRA-9607:
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[~tjake] I'll go wrangle someone from devops to get me set up to do that.  BTW, 
we did just downgrade the production cluster from 2.1.5 to 2.1.4, and our Spark 
jobs all work now.  Two weeks of downtime.  Yay.

> Get high load after upgrading from 2.1.3 to cassandra 2.1.6
> -----------------------------------------------------------
>
>                 Key: CASSANDRA-9607
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9607
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: OS: 
> CentOS 6 * 4
> Ubuntu 14.04 * 2
> JDK: Oracle JDK 7, Oracle JDK 8
> VM: Azure VM Standard A3 * 6
> RAM: 7 GB
> Cores: 4
>            Reporter: Study Hsueh
>            Assignee: Tyler Hobbs
>            Priority: Critical
>             Fix For: 2.1.x, 2.2.0 rc2
>
>         Attachments: cassandra.yaml, load.png, log.zip, schema.zip
>
>
> After upgrading cassandra version from 2.1.3 to 2.1.6, the average load of my 
> cassandra cluster grows from 0.x~1.x to 3.x~6.x. 
> What kind of additional information should I provide for this problem?



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