Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/4729#discussion_r148810490
--- Diff:
flink-yarn/src/main/java/org/apache/flink/yarn/YarnWorkerNode.java ---
@@ -0,0 +1,47 @@
+/*
+ * 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 org.apache.flink.runtime.clusterframework.types.ResourceID;
+import
org.apache.flink.runtime.clusterframework.types.ResourceIDRetrievable;
+
+import org.apache.hadoop.yarn.api.records.Container;
+
+import java.io.Serializable;
+
+/**
+ * A stored YARN worker, which contains the YARN container.
+ */
+public class YarnWorkerNode implements ResourceIDRetrievable, Serializable
{
+
+ private Container yarnContainer;
+
+ public YarnWorkerNode(Container container) {
+ this.yarnContainer = container;
--- End diff --
`Preconditions.checkNotNull`.
---
