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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-5283) giving SimpleStrategy rack alignment
Date Sat, 23 Mar 2013 04:47:21 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5283?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis resolved CASSANDRA-5283.
---------------------------------------

    Resolution: Not A Problem
    
> giving SimpleStrategy rack alignment
> ------------------------------------
>
>                 Key: CASSANDRA-5283
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5283
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Dominique De Vito
>            Priority: Minor
>
> SimpleStrategy is not rack aware.
> But NetworkTopologyStrategy could lead to overloaded nodes, see https://issues.apache.org/jira/browse/CASSANDRA-3810
> The idea here is to enable to use SimpleStrategy with the configuration associated with
NetworkTopologyStrategy:
> * the placement strategy would be the one of SimpleStrategy;
> * Cassandra would be able to exploit rack config (similar to the one of NetworkTopologyStrategy)
to give a simple placement diagnostic; such a diagnostic could tell, for example:
> ** "optimal": if all replica are on different racks
> ** "sub-optimal": if some replica are on the same rack, while there are replica on different
racks
> ** "spof": if all replica are on the same rack
> ** "?": if the snitch doesn't provide enough information to make a diagnostic
> This enhancement of SimpleStrategy has multiple advantages:
> * it's compatible with (already existing) SimpleStrategy;
> * it sits between current SimpleStrategy and NetworkTopologyStrategy, so it's helpful
when expecting to move, for example, from 1 DC to 2 DC.
> * and more importantly, it's inline with Cassandra global strategy: offering simple services,
and providing tools to repair/fix the database.

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