/**
* 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.tools;
import java.io.IOException;
import java.util.Map;
import java.util.Set;
import org.apache.log4j.Logger;
import org.apache.cassandra.config.DatabaseDescriptor;
import org.apache.cassandra.io.DataInputBuffer;
import org.apache.cassandra.net.EndPoint;
import org.apache.cassandra.net.IVerbHandler;
import org.apache.cassandra.net.Message;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.service.StorageService;
import org.apache.cassandra.utils.LogUtil;
/**
* Author : Avinash Lakshman ( alakshman@facebook.com) & Prashant Malik ( pmalik@facebook.com )
*/
public class MembershipCleanerVerbHandler implements IVerbHandler
{
private static Logger logger_ = Logger.getLogger(MembershipCleanerVerbHandler.class);
public void doVerb(Message message)
{
byte[] body = message.getMessageBody();
try
{
DataInputBuffer bufIn = new DataInputBuffer();
bufIn.reset(body, body.length);
/* Deserialize to get the token for this endpoint. */
MembershipCleaner.MembershipCleanerMessage mcMessage = MembershipCleaner.MembershipCleanerMessage.serializer().deserialize(bufIn);
String target = mcMessage.getTarget();
logger_.info("Removing the node [" + target + "] from membership");
EndPoint targetEndPoint = new EndPoint(target, DatabaseDescriptor.getControlPort());
/* Remove the token related information for this endpoint */
StorageService.instance().removeTokenState(targetEndPoint);
/* Get the headers for this message */
Map<String, byte[]> headers = message.getHeaders();
headers.remove( StorageService.getLocalStorageEndPoint().getHost() );
logger_.debug("Number of nodes in the header " + headers.size());
Set<String> nodes = headers.keySet();
for ( String node : nodes )
{
logger_.debug("Processing node " + node);
byte[] bytes = headers.remove(node);
/* Send a message to this node to alter its membership state. */
EndPoint targetNode = new EndPoint(node, DatabaseDescriptor.getStoragePort());
logger_.debug("Sending a membership clean message to " + targetNode);
MessagingService.getMessagingInstance().sendOneWay(message, targetNode);
break;
}
}
catch( IOException ex )
{
logger_.debug(LogUtil.throwableToString(ex));
}
}
}