Examples of org.apache.cassandra.locator.DatacenterShardStrategy

org.apache.cassandra.locator.DatacenterShardStrategy
This Replication Strategy takes a property file that gives the intended replication factor in each datacenter. The sum total of the datacenter replication factor values should be equal to the keyspace replication factor.
So for example, if the keyspace replication factor is 6, the datacenter replication factors could be 3, 2, and 1 - so 3 replicas in one datacenter, 2 in another, and 1 in another - totalling 6.
This class also caches the Endpoints and invalidates the cache if there is a change in the number of tokens.




    @Override
    protected int determineBlockFor(String table)
    {
        DatacenterShardStrategy strategy = (DatacenterShardStrategy) StorageService.instance.getReplicationStrategy(table);
        return (strategy.getReplicationFactor(localdc) / 2) + 1;
    }

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    }
    
    @Override
    public int determineBlockFor(ConsistencyLevel consistency_level, String table)
  {
    DatacenterShardStrategy stategy = (DatacenterShardStrategy) StorageService.instance.getReplicationStrategy(table);
    return (stategy.getReplicationFactor(localdc) / 2) + 1;
  }

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