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From mxm <...@git.apache.org>
Subject [GitHub] flink pull request #2313: [FLINK-4273] Modify JobClient to attach to running...
Date Fri, 19 Aug 2016 13:40:21 GMT
Github user mxm commented on a diff in the pull request:

    --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/client/JobClient.java ---
    @@ -118,27 +138,162 @@ public static JobExecutionResult submitJobAndWait(
     		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 --
    In addition to the result, you'll also need the class loader for getting accumulators
of a running job. 
    I agree that it would be nice to fail when the class loader can't be reconstructed, but
*only* if it is really the only option. So we could start off with the class loader set to
`None` in the `JobListeningContext`. When the class loader is needed, i.e. accumulator retrieval
or job execution result retrieval, it is fetched.

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