| /** |
| * 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.hadoop.mapred; |
| |
| import java.io.IOException; |
| import java.security.PrivilegedAction; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.ipc.RPC; |
| import org.apache.hadoop.mapreduce.JobID; |
| import org.apache.hadoop.mapreduce.v2.api.HSClientProtocol; |
| import org.apache.hadoop.mapreduce.v2.api.MRClientProtocol; |
| import org.apache.hadoop.mapreduce.v2.jobhistory.JHAdminConfig; |
| import org.apache.hadoop.net.NetUtils; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.hadoop.yarn.exceptions.YarnRuntimeException; |
| import org.apache.hadoop.yarn.ipc.YarnRPC; |
| |
| public class ClientCache { |
| |
| private final Configuration conf; |
| private final ResourceMgrDelegate rm; |
| |
| private static final Log LOG = LogFactory.getLog(ClientCache.class); |
| |
| private Map<JobID, ClientServiceDelegate> cache = |
| new HashMap<JobID, ClientServiceDelegate>(); |
| |
| private MRClientProtocol hsProxy; |
| |
| public ClientCache(Configuration conf, ResourceMgrDelegate rm) { |
| this.conf = conf; |
| this.rm = rm; |
| } |
| |
| //TODO: evict from the cache on some threshold |
| public synchronized ClientServiceDelegate getClient(JobID jobId) { |
| if (hsProxy == null) { |
| try { |
| hsProxy = instantiateHistoryProxy(); |
| } catch (IOException e) { |
| LOG.warn("Could not connect to History server.", e); |
| throw new YarnRuntimeException("Could not connect to History server.", e); |
| } |
| } |
| ClientServiceDelegate client = cache.get(jobId); |
| if (client == null) { |
| client = new ClientServiceDelegate(conf, rm, jobId, hsProxy); |
| cache.put(jobId, client); |
| } |
| return client; |
| } |
| |
| protected synchronized MRClientProtocol getInitializedHSProxy() |
| throws IOException { |
| if (this.hsProxy == null) { |
| hsProxy = instantiateHistoryProxy(); |
| } |
| return this.hsProxy; |
| } |
| |
| protected MRClientProtocol instantiateHistoryProxy() |
| throws IOException { |
| final String serviceAddr = conf.get(JHAdminConfig.MR_HISTORY_ADDRESS); |
| if (StringUtils.isEmpty(serviceAddr)) { |
| return null; |
| } |
| LOG.debug("Connecting to HistoryServer at: " + serviceAddr); |
| final YarnRPC rpc = YarnRPC.create(conf); |
| LOG.debug("Connected to HistoryServer at: " + serviceAddr); |
| UserGroupInformation currentUser = UserGroupInformation.getCurrentUser(); |
| return currentUser.doAs(new PrivilegedAction<MRClientProtocol>() { |
| @Override |
| public MRClientProtocol run() { |
| return (MRClientProtocol) rpc.getProxy(HSClientProtocol.class, |
| NetUtils.createSocketAddr(serviceAddr), conf); |
| } |
| }); |
| } |
| |
| public void close() throws IOException { |
| if (rm != null) { |
| rm.close(); |
| } |
| |
| if (hsProxy != null) { |
| RPC.stopProxy(hsProxy); |
| hsProxy = null; |
| } |
| |
| if (cache != null && !cache.isEmpty()) { |
| for (ClientServiceDelegate delegate : cache.values()) { |
| if (delegate != null) { |
| delegate.close(); |
| delegate = null; |
| } |
| } |
| cache.clear(); |
| cache = null; |
| } |
| } |
| } |