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Posted to commits@cassandra.apache.org by "Melvin Wang (JIRA)" <ji...@apache.org> on 2011/08/26 01:36:29 UTC

[jira] [Commented] (CASSANDRA-3079) Allow the client request scheduler to throw Timeouts

    [ https://issues.apache.org/jira/browse/CASSANDRA-3079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13091421#comment-13091421 ] 

Melvin Wang commented on CASSANDRA-3079:
----------------------------------------

looks good to me.

> Allow the client request scheduler to throw Timeouts
> ----------------------------------------------------
>
>                 Key: CASSANDRA-3079
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3079
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: API
>            Reporter: Stu Hood
>            Assignee: Stu Hood
>            Priority: Minor
>             Fix For: 1.0
>
>         Attachments: 0001-Add-timeouts-to-request-scheduling.txt, 0002-Fix-try-finally-nesting-for-scheduling.txt
>
>
> The RoundRobinScheduler prioritizes threads by allowing them to queue on a SynchronousQueue per scheduling bucket. These queues currently do not use timeouts, and we observed a cascading case where client retries caused the scheduler queues to fill such that latency was way above the client timeout.
> Allowing the IRequestScheduler.queue method to throw a (per-call configurable) timeout, we can avoid this cascading.

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