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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-981) Dynamic endpoint snitch
Date Fri, 24 Sep 2010 14:12:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12914472#action_12914472
] 

Jonathan Ellis commented on CASSANDRA-981:
------------------------------------------

oh, that's funny, in an unfortunate way.  you're right about the getBoolean.  fixed in r1000877
on 0.6 branch.

you're right about the second part too, but that was already fixed in CASSANDRA-1429 (also
on 0.6 branch).

> Dynamic endpoint snitch
> -----------------------
>
>                 Key: CASSANDRA-981
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-981
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Jonathan Ellis
>            Assignee: Brandon Williams
>             Fix For: 0.6.5
>
>         Attachments: 981-0.6.txt, 981-fix-v2.txt, 981-fix.txt, 981.txt
>
>
> An endpoint snitch that automatically and dynamically infers "distance" to other machines
without having to explicitly configure rack and datacenter positions solves two problems:
> The killer feature here is adapting to things like compaction or a failing-but-not-yet-dead
disk.  This is important, since when we are doing reads we pick the "closest" replica for
actually reading data from (and only read md5s from other replicas).  This means that if the
closest replica by network topology is temporarily slow due to compaction (for instance),
we'll have to block for its reply even if we get the other replies much much faster.
> Not having to manually re-sync your configuration with your network topology when changes
(adding machines) are made is a nice bonus.

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