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From "Dominique De Vito (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-5283) giving SimpleStrategy rack alignment
Date Mon, 25 Feb 2013 14:04:12 GMT
Dominique De Vito created CASSANDRA-5283:
--------------------------------------------

             Summary: 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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