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https://issues.apache.org/jira/browse/FLINK-2111?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15032493#comment-15032493
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ASF GitHub Bot commented on FLINK-2111:
---------------------------------------

Github user mjsax commented on a diff in the pull request:

    https://github.com/apache/flink/pull/750#discussion_r46205386
  
    --- Diff: 
flink-clients/src/test/java/org/apache/flink/client/CliFrontendStopTest.java ---
    @@ -0,0 +1,157 @@
    +/*
    + * 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.client;
    +
    +import java.util.UUID;
    +
    +import akka.actor.*;
    +import akka.testkit.JavaTestKit;
    +
    +import org.apache.flink.client.cli.CommandLineOptions;
    +import org.apache.flink.api.common.JobID;
    +import org.apache.flink.runtime.instance.ActorGateway;
    +import org.apache.flink.runtime.instance.AkkaActorGateway;
    +import org.apache.flink.runtime.messages.JobManagerMessages;
    +import org.junit.AfterClass;
    +import org.junit.BeforeClass;
    +import org.junit.Test;
    +
    +import scala.Option;
    +import static 
org.apache.flink.client.CliFrontendTestUtils.pipeSystemOutToNull;
    +import static org.junit.Assert.*;
    +
    +public class CliFrontendStopTest {
    --- End diff --
    
    You might remember that I reworked a coupled of tests in this PR that I 
"removed" to keep this PR clean. I still have this in a local branch -- and it 
contains this change -- together with the same change to the other test classes 
in this package. I would keep it as is here, and apply the changes in a follow 
up commit. ok?


> Add "stop" signal to cleanly shutdown streaming jobs
> ----------------------------------------------------
>
>                 Key: FLINK-2111
>                 URL: https://issues.apache.org/jira/browse/FLINK-2111
>             Project: Flink
>          Issue Type: Improvement
>          Components: Distributed Runtime, JobManager, Local Runtime, 
> Streaming, TaskManager, Webfrontend
>            Reporter: Matthias J. Sax
>            Assignee: Matthias J. Sax
>            Priority: Minor
>
> Currently, streaming jobs can only be stopped using "cancel" command, what is 
> a "hard" stop with no clean shutdown.
> The new introduced "stop" signal, will only affect streaming source tasks 
> such that the sources can stop emitting data and shutdown cleanly, resulting 
> in a clean shutdown of the whole streaming job.
> This feature is a pre-requirment for 
> https://issues.apache.org/jira/browse/FLINK-1929



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