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https://issues.apache.org/jira/browse/FLINK-4273?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428204#comment-15428204
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ASF GitHub Bot commented on FLINK-4273:
---------------------------------------

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

    https://github.com/apache/flink/pull/2313#discussion_r75483059
  
    --- Diff: 
flink-runtime/src/main/java/org/apache/flink/runtime/client/JobClient.java ---
    @@ -118,27 +138,162 @@ public static JobExecutionResult submitJobAndWait(
                        sysoutLogUpdates);
     
                ActorRef jobClientActor = 
actorSystem.actorOf(jobClientActorProps);
    -           
    +
    +           Future<Object> submissionFuture = Patterns.ask(
    +                           jobClientActor,
    +                           new 
JobClientMessages.SubmitJobAndWait(jobGraph),
    +                           new Timeout(AkkaUtils.INF_TIMEOUT()));
    +
    +           return new JobListeningContext(
    +                           jobGraph.getJobID(),
    +                           submissionFuture,
    +                           jobClientActor,
    +                           classLoader);
    +   }
    +
    +
    +   /**
    +    * Attaches to a running Job using the JobID.
    +    * Reconstructs the user class loader by downloading the jars from the 
JobManager.
    +    * @throws JobRetrievalException if anything goes wrong while 
retrieving the job
    +    */
    +   public static JobListeningContext attachToRunningJob(
    +                   JobID jobID,
    +                   ActorGateway jobManagerGateWay,
    +                   Configuration configuration,
    +                   ActorSystem actorSystem,
    +                   LeaderRetrievalService leaderRetrievalService,
    +                   FiniteDuration timeout,
    +                   boolean sysoutLogUpdates) throws JobRetrievalException {
    +
    +           checkNotNull(jobID, "The jobID must not be null.");
    +           checkNotNull(jobManagerGateWay, "The jobManagerGateWay must not 
be null.");
    +           checkNotNull(configuration, "The configuration must not be 
null.");
    +           checkNotNull(actorSystem, "The actorSystem must not be null.");
    +           checkNotNull(leaderRetrievalService, "The jobManagerGateway 
must not be null.");
    +           checkNotNull(timeout, "The timeout must not be null.");
    +
    +           // retrieve classloader first before doing anything
    +           ClassLoader classloader;
    +           try {
    +                   classloader = retrieveClassLoader(jobID, 
jobManagerGateWay, configuration, timeout);
    --- End diff --
    
    Yes that could be a good solution :-)


> Refactor JobClientActor to watch already submitted jobs 
> --------------------------------------------------------
>
>                 Key: FLINK-4273
>                 URL: https://issues.apache.org/jira/browse/FLINK-4273
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Client
>            Reporter: Maximilian Michels
>            Assignee: Maximilian Michels
>            Priority: Minor
>             Fix For: 1.2.0
>
>
> The JobClientActor assumes that it receives a job, submits it, and waits for 
> the result. This process should be broken up into a submission process and a 
> waiting process which can both be entered independently. This leads to two 
> different entry points:
> 1) submit(job) -> wait
> 2) retrieve(jobID) -> wait



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