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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2012/08/16 21:17:38 UTC

[jira] [Updated] (CASSANDRA-4292) Improve JBOD loadbalancing and reduce contention

     [ https://issues.apache.org/jira/browse/CASSANDRA-4292?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-4292:
--------------------------------------

    Summary: Improve JBOD loadbalancing and reduce contention  (was: Per-disk I/O queues)
    
> Improve JBOD loadbalancing and reduce contention
> ------------------------------------------------
>
>                 Key: CASSANDRA-4292
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4292
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Yuki Morishita
>             Fix For: 1.2.0
>
>         Attachments: 4292.txt, 4292-v2.txt, 4292-v3.txt
>
>
> As noted in CASSANDRA-809, we have a certain amount of flush (and compaction) threads, which mix and match disk volumes indiscriminately.  It may be worth creating a tight thread -> disk affinity, to prevent unnecessary conflict at that level.
> OTOH as SSDs become more prevalent this becomes a non-issue.  Unclear how much pain this actually causes in practice in the meantime.

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