Java tutorial
/** * Copyright (C) 2015 DataTorrent, Inc. * * Licensed 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 com.datatorrent.stram; import com.datatorrent.stram.api.StramEvent.ContainerErrorEvent; import com.datatorrent.stram.api.StramEvent.OperatorErrorEvent; import com.datatorrent.stram.api.StreamingContainerUmbilicalProtocol; import com.datatorrent.stram.util.SecureExecutor; import com.datatorrent.stram.webapp.OperatorInfo; import java.io.IOException; import java.net.InetSocketAddress; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.CommonConfigurationKeysPublic; import org.apache.hadoop.ipc.*; import org.apache.hadoop.net.NetUtils; import org.apache.hadoop.security.authorize.PolicyProvider; import org.apache.hadoop.security.authorize.Service; import org.apache.hadoop.security.token.SecretManager; import org.apache.hadoop.security.token.TokenIdentifier; import org.apache.hadoop.yarn.exceptions.YarnRuntimeException; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * * Stram side implementation of communication protocol with hadoop container<p> * <br> * * @since 0.3.2 */ public class StreamingContainerParent extends org.apache.hadoop.service.CompositeService implements StreamingContainerUmbilicalProtocol { private static final Logger LOG = LoggerFactory.getLogger(StreamingContainerParent.class); private Server server; private SecretManager<? extends TokenIdentifier> tokenSecretManager = null; private InetSocketAddress address; private final StreamingContainerManager dagManager; private final int listenerThreadCount; public StreamingContainerParent(String name, StreamingContainerManager dnodeMgr, SecretManager<? extends TokenIdentifier> secretManager, int listenerThreadCount) { super(name); this.dagManager = dnodeMgr; this.tokenSecretManager = secretManager; this.listenerThreadCount = listenerThreadCount; } @Override public void init(Configuration conf) { super.init(conf); } @Override public void start() { startRpcServer(); super.start(); } @Override public void stop() { stopRpcServer(); super.stop(); } protected void startRpcServer() { Configuration conf = getConfig(); LOG.info("Config: " + conf); LOG.info("Listener thread count " + listenerThreadCount); try { server = new RPC.Builder(conf).setProtocol(StreamingContainerUmbilicalProtocol.class).setInstance(this) .setBindAddress("0.0.0.0").setPort(0).setNumHandlers(listenerThreadCount) .setSecretManager(tokenSecretManager).setVerbose(false).build(); // Enable service authorization? if (conf.getBoolean(CommonConfigurationKeysPublic.HADOOP_SECURITY_AUTHORIZATION, false)) { //refreshServiceAcls(conf, new MRAMPolicyProvider()); server.refreshServiceAcl(conf, new PolicyProvider() { @Override public Service[] getServices() { return (new Service[] { new Service(StreamingContainerUmbilicalProtocol.class.getName(), StreamingContainerUmbilicalProtocol.class) }); } }); } server.start(); this.address = NetUtils.getConnectAddress(server); LOG.info("Container callback server listening at " + this.address); } catch (IOException e) { throw new YarnRuntimeException(e); } } protected void stopRpcServer() { server.stop(); } public InetSocketAddress getAddress() { return address; } // Can be used to help test listener thread count public int getListenerThreadCount() { return listenerThreadCount; } void refreshServiceAcls(Configuration configuration, PolicyProvider policyProvider) { this.server.refreshServiceAcl(configuration, policyProvider); } @Override public ProtocolSignature getProtocolSignature(String protocol, long clientVersion, int clientMethodsHash) throws IOException { return ProtocolSignature.getProtocolSignature(this, protocol, clientVersion, clientMethodsHash); } @Override public long getProtocolVersion(String arg0, long arg1) throws IOException { return StreamingContainerUmbilicalProtocol.versionID; } @Override public void log(String containerId, String msg) throws IOException { LOG.info("child msg: {} context: {}", msg, dagManager.getContainerAgent(containerId).container); } @Override public void reportError(String containerId, int[] operators, String msg) { if (operators == null || operators.length == 0) { dagManager.recordEventAsync(new ContainerErrorEvent(containerId, msg)); } else { for (int operator : operators) { OperatorInfo operatorInfo = dagManager.getOperatorInfo(operator); if (operatorInfo != null) { dagManager.recordEventAsync( new OperatorErrorEvent(operatorInfo.name, operator, containerId, msg)); } } } try { log(containerId, msg); } catch (IOException ex) { // ignore } } @Override public StreamingContainerContext getInitContext(String containerId) throws IOException { StreamingContainerAgent sca = dagManager.getContainerAgent(containerId); return sca.getInitContext(); } @Override public ContainerHeartbeatResponse processHeartbeat(ContainerHeartbeat msg) { // -- TODO // Change to use some sort of a annotation that developers can use to specify secure code // For now using SecureExecutor work load. Also change sig to throw Exception long now = System.currentTimeMillis(); if (msg.sentTms - now > 50) { LOG.warn( "Child container heartbeat sent time for {} ({}) is greater than the receive timestamp in AM ({}). Please make sure the clocks are in sync", msg.getContainerId(), msg.sentTms, now); } //LOG.debug("RPC latency from child container {} is {} ms (according to system clocks)", msg.getContainerId(), now - msg.sentTms); dagManager.updateRPCLatency(msg.getContainerId(), now - msg.sentTms); try { final ContainerHeartbeat fmsg = msg; return SecureExecutor.execute(new SecureExecutor.WorkLoad<ContainerHeartbeatResponse>() { @Override public ContainerHeartbeatResponse run() { return dagManager.processHeartbeat(fmsg); } }); } catch (IOException ex) { LOG.error("Error processing heartbeat", ex); return null; } } }