Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/2313#discussion_r75476846
--- 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 --
Yeah that's the question: Shall we fail or try to perform on a best effort
basis. If you have user code classes in your result, then the deserialization
will fail later on, right? In this case, it would be better imo that the user
tries the operation again because the failure might have been caused by a
leader change. On the other hand you might only be interested in the cancel,
stop job commands and are not interested in the deserialized result.
Would it be possible that we first connect to the `JobManager` and only if
we want to wait for the job result we try to reconstruct the classloader? If
that fails, then we throw an exception.
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