Github user bowenli86 commented on a diff in the pull request:
https://github.com/apache/flink/pull/4697#discussion_r141241787
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/messages/JobNotFoundException.java
---
@@ -0,0 +1,34 @@
+/*
+ * 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.runtime.messages;
+
+import org.apache.flink.api.common.JobID;
+import org.apache.flink.util.FlinkException;
+
+/**
+ * Exception which is returned if a job could not be found.
+ */
+public class JobNotFoundException extends FlinkException {
+
+ private static final long serialVersionUID = -7803390762010615384L;
+
+ public JobNotFoundException(JobID jobId) {
+ super("Could not find job (" + jobId + ").");
--- End diff --
I feel "Could not find Flink job ..." is better
---
