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From jun...@apache.org
Subject 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...
Date Mon, 24 Aug 2009 23:39:28 GMT
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
==============================================================================
Binary file - no diff available.

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);
+    }
+}



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