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From "Brandon Williams (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-2004) dynamic snitch doesn't collect local latencies
Date Wed, 19 Jan 2011 04:04:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12983530#action_12983530
] 

Brandon Williams commented on CASSANDRA-2004:
---------------------------------------------

When weakReadLocalCallable calls MS.addLatency, MS has no subscribers to notify.

> dynamic snitch doesn't collect local latencies
> ----------------------------------------------
>
>                 Key: CASSANDRA-2004
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2004
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.6.9
>            Reporter: Brandon Williams
>            Assignee: Jonathan Ellis
>             Fix For: 0.6.10
>
>         Attachments: 0001_add_ability_to_dump_DES_timings.txt, 2004.txt
>
>
> The dynamic snitch doesn't collect local latencies, which means that if a coordinator
has a local replica it will end up preferring whatever the subsnitch returns.  In 0.7 we already
collect local latencies by going through MessagingService, so we should do the same in 0.6.

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