Dominique De Vito created CASSANDRA-5283:
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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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