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Expose ring map to client for more direct access; patch by junrao; reviewed by jbellis for CASSANDRA-197 

git-svn-id: https://svn.apache.org/repos/asf/incubator/cassandra/trunk@807431 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Jun Rao 2009-08-24 23:39:27 +00:00
parent a2899de137
commit c4992f48ce
8 changed files with 411 additions and 2 deletions
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src/java/org/apache/cassandra/client/RingCache.java Normal file
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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.client;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.locator.IReplicaPlacementStrategy;
import org.apache.cassandra.locator.TokenMetadata;
import org.apache.cassandra.net.EndPoint;
import org.apache.cassandra.service.Cassandra;
import org.apache.cassandra.service.CassandraServer;
import org.apache.cassandra.service.StorageService;
import org.apache.log4j.Logger;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.transport.TSocket;
import flexjson.JSONTokener;
/**
* A class for caching the ring map at the client. For usage example, see
* test/unit/org.apache.cassandra.client.TestRingCache.java.
*/
public class RingCache
{
final private static Logger logger_ = Logger.getLogger(RingCache.class);
private Set<String> seeds_ = new HashSet<String>();
final private int port_=DatabaseDescriptor.getThriftPort();
private volatile IReplicaPlacementStrategy nodePicker_;
final private static IPartitioner partitioner_ = DatabaseDescriptor.getPartitioner();
public RingCache()
{
seeds_ = DatabaseDescriptor.getSeeds();
refreshEndPointMap();
}
public void refreshEndPointMap()
{
for (String seed : seeds_)
{
try
{
TSocket socket = new TSocket(seed, port_);
TBinaryProtocol binaryProtocol = new TBinaryProtocol(socket, false, false);
Cassandra.Client client = new Cassandra.Client(binaryProtocol);
socket.open();
Map<String,String> tokenToHostMap = (Map<String,String>) new JSONTokener(client.get_string_property(CassandraServer.TOKEN_MAP)).nextValue();
HashMap<Token, EndPoint> tokenEndpointMap = new HashMap<Token, EndPoint>();
Map<EndPoint, Token> endpointTokenMap = new HashMap<EndPoint, Token>();
for (Map.Entry<String,String> entry : tokenToHostMap.entrySet())
{
Token token = StorageService.getPartitioner().getTokenFactory().fromString(entry.getKey());
String host = entry.getValue();
tokenEndpointMap.put(token, new EndPoint(host, port_));
endpointTokenMap.put(new EndPoint(host, port_), token);
}
TokenMetadata tokenMetadata = new TokenMetadata(tokenEndpointMap, endpointTokenMap, null);
Class cls = DatabaseDescriptor.getReplicaPlacementStrategyClass();
Class [] parameterTypes = new Class[] { TokenMetadata.class, IPartitioner.class, int.class, int.class};
try
{
nodePicker_ = (IReplicaPlacementStrategy) cls.getConstructor(parameterTypes).newInstance(tokenMetadata, partitioner_, DatabaseDescriptor.getReplicationFactor(), port_);
}
catch (Exception e)
{
throw new RuntimeException(e);
}
break;
}
catch (TException e)
{
/* let the Exception go and try another seed. log this though */
logger_.debug("Error contacting seed " + seed + " " + e.getMessage());
}
}
}
public EndPoint[] getEndPoint(String key)
{
return nodePicker_.getStorageEndPoints(partitioner_.getToken(key));
}
}

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src/java/org/apache/cassandra/dht/Token.java
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@ -51,7 +51,7 @@ public abstract class Token<T extends Comparable> implements Comparable<Token<T>
public String toString()
{
return "Token(" + token + ")";
return token.toString();
}
public boolean equals(Object obj)

3
src/java/org/apache/cassandra/locator/TokenMetadata.java
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@ -41,10 +41,11 @@ public class TokenMetadata
{
}
private TokenMetadata(Map<Token, EndPoint> tokenToEndPointMap, Map<EndPoint, Token> endPointToTokenMap, Map<EndPoint, Token> bootstrapNodes)
public TokenMetadata(Map<Token, EndPoint> tokenToEndPointMap, Map<EndPoint, Token> endPointToTokenMap, Map<EndPoint, Token> bootstrapNodes)
{
tokenToEndPointMap_ = tokenToEndPointMap;
endPointToTokenMap_ = endPointToTokenMap;
this.bootstrapNodes = bootstrapNodes;
}
public TokenMetadata cloneMe()

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src/java/org/apache/cassandra/service/CassandraServer.java
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@ -33,13 +33,18 @@ import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.marshal.MarshalException;
import org.apache.cassandra.db.filter.QueryPath;
import org.apache.cassandra.net.EndPoint;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.LogUtil;
import org.apache.cassandra.dht.OrderPreservingPartitioner;
import org.apache.cassandra.dht.Token;
import org.apache.thrift.TException;
import flexjson.JSONSerializer;
public class CassandraServer implements Cassandra.Iface
{
public static String TOKEN_MAP = "token map";
private static Logger logger = Logger.getLogger(CassandraServer.class);
private final static List<ColumnOrSuperColumn> EMPTY_COLUMNS = Collections.emptyList();
@ -404,6 +409,14 @@ public class CassandraServer implements Cassandra.Iface
return "file not found!";
}
}
else if (propertyName.equals(TOKEN_MAP))
{
HashMap<String, String> tokenToHostMap = new HashMap<String,String>();
Map<Token, EndPoint> endpointMap = storageService.getLiveEndPointMap();
for (Map.Entry<Token, EndPoint> e : endpointMap.entrySet())
tokenToHostMap.put(e.getKey().toString(), e.getValue().getHost());
return new JSONSerializer().serialize(tokenToHostMap);
}
else if (propertyName.equals("version"))
{
return "0.3.0";

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src/java/org/apache/cassandra/service/StorageService.java
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@ -1100,4 +1100,9 @@ public final class StorageService implements IEndPointStateChangeSubscriber, Sto
}
return suitableEndPoints;
}
Map<Token, EndPoint> getLiveEndPointMap()
{
return tokenMetadata_.cloneTokenEndPointMap();
}
}

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test/unit/org/apache/cassandra/client/TestRingCache.java Normal file
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@ -0,0 +1,81 @@
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.client;
import org.apache.cassandra.net.EndPoint;
import org.apache.cassandra.service.Cassandra;
import org.apache.cassandra.service.Column;
import org.apache.cassandra.service.ColumnPath;
import org.apache.thrift.protocol.TBinaryProtocol;
import org.apache.thrift.transport.TSocket;
import org.apache.thrift.transport.TTransport;
/**
* Sample code that uses RingCache in the client.
*/
public class TestRingCache
{
private static RingCache ringCache;
private static Cassandra.Client thriftClient;
static
{
ringCache = new RingCache();
}
private static void setup(String server, int port) throws Exception
{
/* Establish a thrift connection to the cassandra instance */
TSocket socket = new TSocket(server, port);
TTransport transport;
System.out.println(" connected to " + server + ":" + port + ".");
transport = socket;
TBinaryProtocol binaryProtocol = new TBinaryProtocol(transport, false, false);
Cassandra.Client cassandraClient = new Cassandra.Client(binaryProtocol);
transport.open();
thriftClient = cassandraClient;
}
/**
* usage: java -Dstorage-config="confpath" org.apache.cassandra.client.TestRingCache
* @param args
* @throws Exception
*/
public static void main(String[] args) throws Throwable
{
String table = "Keyspace1";
for (int nRows=1; nRows<10; nRows++)
{
String row = "row" + nRows;
ColumnPath col = new ColumnPath("Standard1", null, "col1".getBytes());
EndPoint endPoints[] = ringCache.getEndPoint(row);
String hosts="";
for (int i=0; i<endPoints.length; i++)
hosts = hosts + ((i>0) ? "," : "") + endPoints[i].getHost();
System.out.println("hosts with key " + row + " : " + hosts + "; choose " + endPoints[0].getHost());
// now, read the row back directly from the host owning the row locally
setup(endPoints[0].getHost(), endPoints[0].getPort());
thriftClient.insert(table, row, col, "val1".getBytes(), 1, 1);
Column column=thriftClient.get(table, row, col, 1).column;
System.out.println("read row " + row + " " + new String(column.name) + ":" + new String(column.value) + ":" + column.timestamp);
}
System.exit(1);
}
}