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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2890) Randomize (to some extend) the choice of the first replica for counter increment
Date Tue, 13 Sep 2011 16:23:09 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13103729#comment-13103729
] 

Hudson commented on CASSANDRA-2890:
-----------------------------------

Integrated in Cassandra-0.8 #325 (See [https://builds.apache.org/job/Cassandra-0.8/325/])
    Randomize choice of first replica for counter increments
patch by slebresne; reviewed by jbellis for CASSANDRA-2890

slebresne : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1170219
Files : 
* /cassandra/branches/cassandra-0.8/CHANGES.txt
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/db/CounterMutation.java
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/db/HintedHandOffManager.java
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/service/ReadCallback.java
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/service/StorageProxy.java
* /cassandra/branches/cassandra-0.8/src/java/org/apache/cassandra/utils/FBUtilities.java


> Randomize (to some extend) the choice of the first replica for counter increment
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2890
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2890
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.8.0
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Minor
>              Labels: counters
>             Fix For: 0.8.6
>
>         Attachments: 2890.patch, 2890_v2.patch
>
>
> Right now, we choose the first replica for a counter increments based solely on what
the snitch returns. If the clients requests are well balanced over the cluster and the snitch
not ill configured, this should not be a problem, but this is probably too strong an assumption
to make.
> The goal of this ticket is to change this to choose a random replica in the current data
center instead.

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