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Posted to commits@cassandra.apache.org by ju...@apache.org on 2009/08/25 01:39:28 UTC
svn commit: r807431 - in /incubator/cassandra/trunk: lib/ lib/licenses/
src/java/org/apache/cassandra/client/ src/java/org/apache/cassandra/dht/
src/java/org/apache/cassandra/locator/
src/java/org/apache/cassandra/service/ test/unit/org/apache/cassandr...
Author: junrao
Date: Mon Aug 24 23:39:27 2009
New Revision: 807431
URL: http://svn.apache.org/viewvc?rev=807431&view=rev
Log:
Expose ring map to client for more direct access; patch by junrao; reviewed by jbellis for CASSANDRA-197
Added:
incubator/cassandra/trunk/lib/flexjson.jar (with props)
incubator/cassandra/trunk/lib/licenses/flexjson.jar.LICENSE
incubator/cassandra/trunk/src/java/org/apache/cassandra/client/
incubator/cassandra/trunk/src/java/org/apache/cassandra/client/RingCache.java
incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/
incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/TestRingCache.java
Modified:
incubator/cassandra/trunk/src/java/org/apache/cassandra/dht/Token.java
incubator/cassandra/trunk/src/java/org/apache/cassandra/locator/TokenMetadata.java
incubator/cassandra/trunk/src/java/org/apache/cassandra/service/CassandraServer.java
incubator/cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java
Added: incubator/cassandra/trunk/lib/flexjson.jar
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/lib/flexjson.jar?rev=807431&view=auto
==============================================================================
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Propchange: incubator/cassandra/trunk/lib/flexjson.jar
------------------------------------------------------------------------------
svn:mime-type = application/octet-stream
Added: incubator/cassandra/trunk/lib/licenses/flexjson.jar.LICENSE
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/lib/licenses/flexjson.jar.LICENSE?rev=807431&view=auto
==============================================================================
--- incubator/cassandra/trunk/lib/licenses/flexjson.jar.LICENSE (added)
+++ incubator/cassandra/trunk/lib/licenses/flexjson.jar.LICENSE Mon Aug 24 23:39:27 2009
@@ -0,0 +1,202 @@
+
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Added: incubator/cassandra/trunk/src/java/org/apache/cassandra/client/RingCache.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/src/java/org/apache/cassandra/client/RingCache.java?rev=807431&view=auto
==============================================================================
--- incubator/cassandra/trunk/src/java/org/apache/cassandra/client/RingCache.java (added)
+++ incubator/cassandra/trunk/src/java/org/apache/cassandra/client/RingCache.java Mon Aug 24 23:39:27 2009
@@ -0,0 +1,107 @@
+/**
+ * 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));
+ }
+}
Modified: incubator/cassandra/trunk/src/java/org/apache/cassandra/dht/Token.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/src/java/org/apache/cassandra/dht/Token.java?rev=807431&r1=807430&r2=807431&view=diff
==============================================================================
--- incubator/cassandra/trunk/src/java/org/apache/cassandra/dht/Token.java (original)
+++ incubator/cassandra/trunk/src/java/org/apache/cassandra/dht/Token.java Mon Aug 24 23:39:27 2009
@@ -51,7 +51,7 @@
public String toString()
{
- return "Token(" + token + ")";
+ return token.toString();
}
public boolean equals(Object obj)
Modified: incubator/cassandra/trunk/src/java/org/apache/cassandra/locator/TokenMetadata.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/src/java/org/apache/cassandra/locator/TokenMetadata.java?rev=807431&r1=807430&r2=807431&view=diff
==============================================================================
--- incubator/cassandra/trunk/src/java/org/apache/cassandra/locator/TokenMetadata.java (original)
+++ incubator/cassandra/trunk/src/java/org/apache/cassandra/locator/TokenMetadata.java Mon Aug 24 23:39:27 2009
@@ -41,10 +41,11 @@
{
}
- 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()
Modified: incubator/cassandra/trunk/src/java/org/apache/cassandra/service/CassandraServer.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/src/java/org/apache/cassandra/service/CassandraServer.java?rev=807431&r1=807430&r2=807431&view=diff
==============================================================================
--- incubator/cassandra/trunk/src/java/org/apache/cassandra/service/CassandraServer.java (original)
+++ incubator/cassandra/trunk/src/java/org/apache/cassandra/service/CassandraServer.java Mon Aug 24 23:39:27 2009
@@ -33,13 +33,18 @@
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 @@
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";
Modified: incubator/cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java?rev=807431&r1=807430&r2=807431&view=diff
==============================================================================
--- incubator/cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java (original)
+++ incubator/cassandra/trunk/src/java/org/apache/cassandra/service/StorageService.java Mon Aug 24 23:39:27 2009
@@ -1100,4 +1100,9 @@
}
return suitableEndPoints;
}
+
+ Map<Token, EndPoint> getLiveEndPointMap()
+ {
+ return tokenMetadata_.cloneTokenEndPointMap();
+ }
}
Added: incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/TestRingCache.java
URL: http://svn.apache.org/viewvc/incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/TestRingCache.java?rev=807431&view=auto
==============================================================================
--- incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/TestRingCache.java (added)
+++ incubator/cassandra/trunk/test/unit/org/apache/cassandra/client/TestRingCache.java Mon Aug 24 23:39:27 2009
@@ -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);
+ }
+}