| /* |
| * 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.twill.internal.yarn; |
| |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.hadoop.security.Credentials; |
| import org.apache.hadoop.security.UserGroupInformation; |
| import org.apache.twill.api.RunId; |
| import org.apache.twill.filesystem.Location; |
| import org.apache.twill.internal.AbstractTwillService; |
| import org.apache.twill.internal.Constants; |
| import org.apache.twill.internal.state.Message; |
| import org.apache.twill.internal.state.SystemMessages; |
| import org.apache.twill.zookeeper.ZKClient; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.BufferedInputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| |
| /** |
| * Abstract class for implementing {@link com.google.common.util.concurrent.Service} that runs in |
| * YARN container which provides methods to handle secure token updates. |
| */ |
| public abstract class AbstractYarnTwillService extends AbstractTwillService { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AbstractYarnTwillService.class); |
| |
| private final Configuration config; |
| private final Location applicationLocation; |
| protected volatile Credentials credentials; |
| |
| protected AbstractYarnTwillService(ZKClient zkClient, RunId runId, |
| Configuration config, Location applicationLocation) { |
| super(zkClient, runId); |
| this.config = config; |
| this.applicationLocation = applicationLocation; |
| } |
| |
| /** |
| * Returns the location of the secure store, or {@code null} if either not running in secure mode or an error |
| * occur when trying to acquire the location. |
| */ |
| protected final Location getSecureStoreLocation() { |
| if (!UserGroupInformation.isSecurityEnabled()) { |
| return null; |
| } |
| try { |
| return applicationLocation.append(Constants.Files.CREDENTIALS); |
| } catch (IOException e) { |
| LOG.error("Failed to create secure store location.", e); |
| return null; |
| } |
| } |
| |
| /** |
| * Attempts to handle secure store update. |
| * |
| * @param message The message received |
| * @return {@code true} if the message requests for secure store update, {@code false} otherwise. |
| */ |
| protected final boolean handleSecureStoreUpdate(Message message) { |
| if (!SystemMessages.SECURE_STORE_UPDATED.equals(message)) { |
| return false; |
| } |
| |
| // If not in secure mode, simply ignore the message. |
| if (!UserGroupInformation.isSecurityEnabled()) { |
| return true; |
| } |
| |
| try { |
| Credentials credentials = new Credentials(); |
| Location location = getSecureStoreLocation(); |
| |
| // If failed to determine the secure store location, simply ignore the message. |
| if (location == null) { |
| return true; |
| } |
| |
| try (DataInputStream input = new DataInputStream(new BufferedInputStream(location.getInputStream()))) { |
| credentials.readTokenStorageStream(input); |
| } |
| |
| UserGroupInformation.getCurrentUser().addCredentials(credentials); |
| |
| // Clone the HDFS tokens for HA NameNode. This is to workaround bug HDFS-9276. |
| YarnUtils.cloneHaNnCredentials(config); |
| this.credentials = credentials; |
| |
| LOG.info("Secure store updated from {}.", location); |
| |
| } catch (Throwable t) { |
| LOG.error("Failed to update secure store.", t); |
| } |
| |
| return true; |
| } |
| } |