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https://issues.apache.org/jira/browse/CASSANDRA-1035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884375#action_12884375
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Stu Hood commented on CASSANDRA-1035:
-------------------------------------
+1 from me: throughput isn't affected with NoScheduler, and drops off by around
8% with unbounded throttling.
{quote}
stress.py default reads (1mm rows, 5 cols, 50 threads)
nosched
154 secs
roundrobin (throttle_limit = 25)
172 secs
roundrobin (throttle_limit = 80/default)
166 secs
roundrobin (throttle_limit = 1000)
167 secs
{quote}
> Implement User/Keyspace throughput Scheduler
> --------------------------------------------
>
> Key: CASSANDRA-1035
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1035
> Project: Cassandra
> Issue Type: Improvement
> Affects Versions: 0.7
> Reporter: Stu Hood
> Assignee: Nirmal Ranganathan
> Fix For: 0.7
>
> Attachments:
> 0001-Adding-the-RequestScheduler-abstraction-and-a-simple.patch,
> 0002-Thrift-related-changes-for-RequestScheduler-added-a-.patch,
> 0003-Avro-related-changes-for-RequestScheduler.patch,
> 0004-Test-case-for-RoundRobinScheduler.patch,
> 0005-Add-options-for-throttling.patch
>
>
> To support multiple applications on top of a single Cassandra cluster (and to
> protect against badly behaving clients) having a very simple scheduler for
> client operations 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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