Example usage for org.apache.cassandra.locator AbstractReplicationStrategy getReplicationFactor

Introduction

In this page you can find the example usage for org.apache.cassandra.locator AbstractReplicationStrategy getReplicationFactor.

Prototype

public abstract ReplicationFactor getReplicationFactor();

Source Link

Document

calculate the RF based on strategy_options.

Usage

From source file:org.elassandra.cluster.InternalCassandraClusterService.java

License:Apache License

public ClusterState updateNumberOfShards(ClusterState currentState) {
    int numberOfNodes = currentState.nodes().size();
    assert numberOfNodes > 0;
    MetaData.Builder metaDataBuilder = MetaData.builder(currentState.metaData());
    for (Iterator<IndexMetaData> it = currentState.metaData().iterator(); it.hasNext();) {
        IndexMetaData indexMetaData = it.next();
        IndexMetaData.Builder indexMetaDataBuilder = IndexMetaData.builder(indexMetaData);
        indexMetaDataBuilder.numberOfShards(numberOfNodes);
        String keyspace = indexMetaData.keyspace();
        if (Schema.instance != null && Schema.instance.getKeyspaceInstance(keyspace) != null) {
            AbstractReplicationStrategy replicationStrategy = Schema.instance.getKeyspaceInstance(keyspace)
                    .getReplicationStrategy();
            int rf = replicationStrategy.getReplicationFactor();
            if (replicationStrategy instanceof NetworkTopologyStrategy) {
                rf = ((NetworkTopologyStrategy) replicationStrategy)
                        .getReplicationFactor(DatabaseDescriptor.getLocalDataCenter());
            }/*from   w  w w  . j  av a  2s . c om*/
            indexMetaDataBuilder.numberOfReplicas(Math.max(0, rf - 1));
        } else {
            indexMetaDataBuilder.numberOfReplicas(0);
        }
        metaDataBuilder.put(indexMetaDataBuilder.build(), false);
    }
    return ClusterState.builder(currentState).metaData(metaDataBuilder.build()).build();
}

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From source file:org.elassandra.cluster.InternalCassandraClusterService.java

License:Apache License

@Override
public ShardInfo shardInfo(String index, ConsistencyLevel cl) {
    Keyspace keyspace = Schema.instance.getKeyspaceInstance(state().metaData().index(index).keyspace());
    AbstractReplicationStrategy replicationStrategy = keyspace.getReplicationStrategy();
    int rf = replicationStrategy.getReplicationFactor();
    if (replicationStrategy instanceof NetworkTopologyStrategy)
        rf = ((NetworkTopologyStrategy) replicationStrategy)
                .getReplicationFactor(DatabaseDescriptor.getLocalDataCenter());
    return new ShardInfo(rf, cl.blockFor(keyspace));
}

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