Github user mxm commented on a diff in the pull request:
https://github.com/apache/flink/pull/2313#discussion_r75482760
--- 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 --
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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