Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2744#discussion_r89293704
--- Diff:
flink-yarn/src/main/java/org/apache/flink/yarn/YarnFlinkApplicationMasterRunner.java
---
@@ -0,0 +1,612 @@
+/*
+ * 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.flink.yarn;
+
+import akka.actor.ActorSystem;
+import org.apache.flink.api.common.JobExecutionResult;
+import org.apache.flink.api.common.time.Time;
+import org.apache.flink.configuration.ConfigConstants;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.configuration.GlobalConfiguration;
+import org.apache.flink.configuration.HighAvailabilityOptions;
+import org.apache.flink.runtime.akka.AkkaUtils;
+import org.apache.flink.runtime.client.JobExecutionException;
+import org.apache.flink.runtime.clusterframework.ApplicationStatus;
+import org.apache.flink.runtime.clusterframework.BootstrapTools;
+import
org.apache.flink.runtime.execution.librarycache.BlobLibraryCacheManager;
+import org.apache.flink.runtime.highavailability.HighAvailabilityServices;
+import
org.apache.flink.runtime.highavailability.HighAvailabilityServicesUtils;
+import org.apache.flink.runtime.jobgraph.JobGraph;
+import org.apache.flink.runtime.jobmanager.OnCompletionActions;
+import org.apache.flink.runtime.jobmaster.JobManagerServices;
+import org.apache.flink.runtime.jobmaster.JobMaster;
+import org.apache.flink.runtime.leaderelection.LeaderContender;
+import org.apache.flink.runtime.leaderelection.LeaderElectionService;
+import org.apache.flink.runtime.metrics.MetricRegistry;
+import org.apache.flink.runtime.metrics.MetricRegistryConfiguration;
+import org.apache.flink.runtime.metrics.groups.JobManagerMetricGroup;
+import org.apache.flink.runtime.resourcemanager.JobLeaderIdService;
+import org.apache.flink.runtime.resourcemanager.ResourceManager;
+import
org.apache.flink.runtime.resourcemanager.ResourceManagerConfiguration;
+import
org.apache.flink.runtime.resourcemanager.exceptions.ConfigurationException;
+import
org.apache.flink.runtime.resourcemanager.slotmanager.DefaultSlotManager;
+import
org.apache.flink.runtime.resourcemanager.slotmanager.SlotManagerFactory;
+import org.apache.flink.runtime.rpc.FatalErrorHandler;
+import org.apache.flink.runtime.rpc.RpcService;
+import org.apache.flink.runtime.rpc.akka.AkkaRpcService;
+import org.apache.flink.runtime.security.SecurityContext;
+import org.apache.flink.runtime.util.EnvironmentInformation;
+import org.apache.flink.runtime.util.JvmShutdownSafeguard;
+import org.apache.flink.runtime.util.SignalHandler;
+import org.apache.flink.yarn.cli.FlinkYarnSessionCli;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
+import org.apache.hadoop.security.UserGroupInformation;
+import org.apache.hadoop.yarn.api.ApplicationConstants.Environment;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import scala.concurrent.duration.FiniteDuration;
+
+import javax.annotation.concurrent.GuardedBy;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.util.Map;
+import java.util.UUID;
+
+/**
+ * This class is the executable entry point for the YARN application
master.
+ * It starts actor system and the actors for {@link
org.apache.flink.runtime.jobmaster.JobMaster}
+ * and {@link org.apache.flink.yarn.YarnResourceManager}.
+ *
+ * The JobMasters handles Flink job execution, while the
YarnResourceManager handles container
+ * allocation and failure detection.
+ */
+public class YarnFlinkApplicationMasterRunner implements LeaderContender,
OnCompletionActions, FatalErrorHandler {
+
+ /** Logger */
+ protected static final Logger LOG =
LoggerFactory.getLogger(YarnFlinkApplicationMasterRunner.class);
+
+ /** The process environment variables */
+ private static final Map<String, String> ENV = System.getenv();
+
+ /** The exit code returned if the initialization of the application
master failed */
+ private static final int INIT_ERROR_EXIT_CODE = 31;
+
+ /** The job graph file path */
+ private static final String JOB_GRAPH_FILE_PATH = "flink.jobgraph.path";
+
+ /** The lock to guard startup / shutdown / manipulation methods */
+ private final Object lock = new Object();
+
+ @GuardedBy("lock")
+ private MetricRegistry metricRegistry;
+
+ @GuardedBy("lock")
+ private HighAvailabilityServices haServices;
+
+ @GuardedBy("lock")
+ private LeaderElectionService jmLeaderElectionService;
+
+ @GuardedBy("lock")
+ private RpcService jobMasterRpcService;
+
+ @GuardedBy("lock")
+ private RpcService resourceManagerRpcService;
+
+ @GuardedBy("lock")
+ private ResourceManager resourceManager;
+
+ @GuardedBy("lock")
+ private JobMaster jobMaster;
--- End diff --
`jobMaster` is accessed outside of the `lock` scope in `getAddress`
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