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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1035) Implement User/Keyspace throughput Scheduler
Date Wed, 07 Jul 2010 13:53:52 GMT


Jonathan Ellis commented on CASSANDRA-1035:

finally, I note that I've removed comments that just say "see the interface where this is
defined" like

+    /* (non-Javadoc)
+     * @see org.apache.cassandra.scheduler.RequestScheduler#queue(java.lang.Thread, java.lang.Integer)
+     * 
+     * Queue nothing as we don't want any scheduling to happen
+     */

since they are basically the equivalent of

i++; // increment i

i.e., they don't add anything to our understanding of what's going on

> Implement User/Keyspace throughput Scheduler
> --------------------------------------------
>                 Key: CASSANDRA-1035
>                 URL:
>             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, 1035-v2.txt,
> 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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