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https://issues.apache.org/jira/browse/CASSANDRA-5283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13586145#comment-13586145
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Jonathan Ellis commented on CASSANDRA-5283:
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I don't understand what you are proposing. How can it be both compatible with
the existing strategy, and yet generate different replica assignments?
> 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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