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https://issues.apache.org/jira/browse/CASSANDRA-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862342#action_12862342
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Ryan King commented on CASSANDRA-1035:
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Agreed that this should be done at the coordinator node.

> Implement User/Keyspace throughput Scheduler
> --------------------------------------------
>
>                 Key: CASSANDRA-1035
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1035
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Stu Hood
>
> To support multiple applications on top of a single Cassandra cluster (and to 
> protect against badly behaving clients) having a very simple scheduler for 
> MUTATION-STAGE and READ-STAGE would be very beneficial.
> Since all tasks are short lived, a sufficient scheduler would probably only 
> need to manage the queue of incoming requests, and weight them based on an 
> assigned ID. The ID could be dynamically determined by using ip, userid or 
> keyspace for instance, and then each Runnable would be assigned an ID.

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