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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
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* 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.hadoop.ozone.container.common.statemachine;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.IOUtils;
import org.apache.hadoop.ipc.ProtobufRpcEngine;
import org.apache.hadoop.ipc.RPC;
import org.apache.hadoop.metrics2.util.MBeans;
import org.apache.hadoop.net.NetUtils;
import org.apache.hadoop.ozone.protocolPB
.StorageContainerDatanodeProtocolClientSideTranslatorPB;
import org.apache.hadoop.ozone.protocolPB.StorageContainerDatanodeProtocolPB;
import org.apache.hadoop.security.UserGroupInformation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.management.ObjectName;
import java.io.Closeable;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import static org.apache.hadoop.hdds.scm.HddsServerUtil
.getScmRpcTimeOutInMilliseconds;
/**
* SCMConnectionManager - Acts as a class that manages the membership
* information of the SCMs that we are working with.
*/
public class SCMConnectionManager
implements Closeable, SCMConnectionManagerMXBean {
private static final Logger LOG =
LoggerFactory.getLogger(SCMConnectionManager.class);
private final ReadWriteLock mapLock;
private final Map<InetSocketAddress, EndpointStateMachine> scmMachines;
private final int rpcTimeout;
private final Configuration conf;
private final ObjectName jmxBean;
public SCMConnectionManager(Configuration conf) {
this.mapLock = new ReentrantReadWriteLock();
Long timeOut = getScmRpcTimeOutInMilliseconds(conf);
this.rpcTimeout = timeOut.intValue();
this.scmMachines = new HashMap<>();
this.conf = conf;
jmxBean = MBeans.register("OzoneDataNode",
"SCMConnectionManager",
this);
}
/**
* Returns Config.
*
* @return ozoneConfig.
*/
public Configuration getConf() {
return conf;
}
/**
* Get RpcTimeout.
*
* @return - Return RPC timeout.
*/
public int getRpcTimeout() {
return rpcTimeout;
}
/**
* Takes a read lock.
*/
public void readLock() {
this.mapLock.readLock().lock();
}
/**
* Releases the read lock.
*/
public void readUnlock() {
this.mapLock.readLock().unlock();
}
/**
* Takes the write lock.
*/
public void writeLock() {
this.mapLock.writeLock().lock();
}
/**
* Releases the write lock.
*/
public void writeUnlock() {
this.mapLock.writeLock().unlock();
}
/**
* adds a new SCM machine to the target set.
*
* @param address - Address of the SCM machine to send heatbeat to.
* @throws IOException
*/
public void addSCMServer(InetSocketAddress address) throws IOException {
writeLock();
try {
if (scmMachines.containsKey(address)) {
LOG.warn("Trying to add an existing SCM Machine to Machines group. " +
"Ignoring the request.");
return;
}
RPC.setProtocolEngine(conf, StorageContainerDatanodeProtocolPB.class,
ProtobufRpcEngine.class);
long version =
RPC.getProtocolVersion(StorageContainerDatanodeProtocolPB.class);
StorageContainerDatanodeProtocolPB rpcProxy = RPC.getProxy(
StorageContainerDatanodeProtocolPB.class, version,
address, UserGroupInformation.getCurrentUser(), conf,
NetUtils.getDefaultSocketFactory(conf), getRpcTimeout());
StorageContainerDatanodeProtocolClientSideTranslatorPB rpcClient =
new StorageContainerDatanodeProtocolClientSideTranslatorPB(rpcProxy);
EndpointStateMachine endPoint =
new EndpointStateMachine(address, rpcClient, conf);
scmMachines.put(address, endPoint);
} finally {
writeUnlock();
}
}
/**
* Removes a SCM machine for the target set.
*
* @param address - Address of the SCM machine to send heatbeat to.
* @throws IOException
*/
public void removeSCMServer(InetSocketAddress address) throws IOException {
writeLock();
try {
if (!scmMachines.containsKey(address)) {
LOG.warn("Trying to remove a non-existent SCM machine. " +
"Ignoring the request.");
return;
}
EndpointStateMachine endPoint = scmMachines.get(address);
endPoint.close();
scmMachines.remove(address);
} finally {
writeUnlock();
}
}
/**
* Returns all known RPCEndpoints.
*
* @return - List of RPC Endpoints.
*/
public Collection<EndpointStateMachine> getValues() {
return scmMachines.values();
}
@Override
public void close() throws IOException {
getValues().forEach(endpointStateMachine
-> IOUtils.cleanupWithLogger(LOG, endpointStateMachine));
MBeans.unregister(jmxBean);
}
@Override
public List<EndpointStateMachineMBean> getSCMServers() {
readLock();
try {
return Collections
.unmodifiableList(new ArrayList<>(scmMachines.values()));
} finally {
readUnlock();
}
}
}
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