Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/2432#discussion_r18191371 --- Diff: core/src/main/java/org/apache/spark/ApplicationId.java --- @@ -0,0 +1,69 @@ +/* + * 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.spark; + +import java.io.Serializable; + +/** + * This class represents unique application id for identifying each application + */ +public class ApplicationId implements Serializable { + + private String appId; + + public ApplicationId(String appId) { + this.appId = appId; + } + + @Override + public boolean equals(Object other) { + if (!(other instanceof ApplicationId)) { + return false; + } else if (other == this) { + return true; + } else if (appId != null) { + return appId.equals(((ApplicationId)other).appId); + } else { + return false; + } + } + + @Override + public int hashCode() { + return appId.hashCode(); + } + + @Override + public String toString() { + return appId; + } + + + private static ApplicationId defaultAppId = + new ApplicationId(String.valueOf(System.currentTimeMillis())); --- End diff -- I don't think that we should have this field in `ApplicationId`. This will always return the same application id, violating our uniqueness requirements.
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