/*
* Druid - a distributed column store.
* Copyright (C) 2012, 2013 Metamarkets Group Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package io.druid.storage.cassandra;
import com.netflix.astyanax.AstyanaxContext;
import com.netflix.astyanax.Keyspace;
import com.netflix.astyanax.connectionpool.NodeDiscoveryType;
import com.netflix.astyanax.connectionpool.impl.ConnectionPoolConfigurationImpl;
import com.netflix.astyanax.connectionpool.impl.CountingConnectionPoolMonitor;
import com.netflix.astyanax.impl.AstyanaxConfigurationImpl;
import com.netflix.astyanax.model.ColumnFamily;
import com.netflix.astyanax.recipes.storage.CassandraChunkedStorageProvider;
import com.netflix.astyanax.recipes.storage.ChunkedStorageProvider;
import com.netflix.astyanax.serializers.StringSerializer;
import com.netflix.astyanax.thrift.ThriftFamilyFactory;
/**
* Superclass for accessing Cassandra Storage.
*
* This is the schema used to support the index and descriptor storage:
*
* CREATE TABLE index_storage ( key text, chunk text, value blob, PRIMARY KEY (key, chunk)) WITH COMPACT STORAGE;
* CREATE TABLE descriptor_storage ( key varchar, lastModified timestamp, descriptor varchar, PRIMARY KEY (key) ) WITH COMPACT STORAGE;
*/
public class CassandraStorage
{
private static final String CLUSTER_NAME = "druid_cassandra_cluster";
private static final String INDEX_TABLE_NAME = "index_storage";
private static final String DESCRIPTOR_TABLE_NAME = "descriptor_storage";
private AstyanaxContext<Keyspace> astyanaxContext;
final Keyspace keyspace;
final ChunkedStorageProvider indexStorage;
final ColumnFamily<String, String> descriptorStorage;
final CassandraDataSegmentConfig config;
public CassandraStorage(CassandraDataSegmentConfig config)
{
this.astyanaxContext = new AstyanaxContext.Builder()
.forCluster(CLUSTER_NAME)
.forKeyspace(config.getKeyspace())
.withAstyanaxConfiguration(new AstyanaxConfigurationImpl().setDiscoveryType(NodeDiscoveryType.NONE))
.withConnectionPoolConfiguration(
new ConnectionPoolConfigurationImpl("MyConnectionPool").setMaxConnsPerHost(10)
.setSeeds(config.getHost())).withConnectionPoolMonitor(new CountingConnectionPoolMonitor())
.buildKeyspace(ThriftFamilyFactory.getInstance());
this.astyanaxContext.start();
this.keyspace = this.astyanaxContext.getEntity();
this.config = config;
indexStorage = new CassandraChunkedStorageProvider(keyspace, INDEX_TABLE_NAME);
descriptorStorage = new ColumnFamily<String, String>(DESCRIPTOR_TABLE_NAME,
StringSerializer.get(), StringSerializer.get());
}
}