[jira] [Commented] (FLINK-3633) Job submission silently fails when using user code types

["Greg Hogan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15201635#comment-15201635 ] 

Greg Hogan commented on FLINK-3633:
-----------------------------------

I am puzzled why this appears to work for some user classes yet fails with other user classes.

> Job submission silently fails when using user code types
> --------------------------------------------------------
>
>                 Key: FLINK-3633
>                 URL: https://issues.apache.org/jira/browse/FLINK-3633
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Till Rohrmann
>            Assignee: Till Rohrmann
>            Priority: Blocker
>             Fix For: 1.1.0
>
>
> With the changes introduced by FLINK-3327, it is no longer possible to run remote Flink jobs which work on user code types. The reason is that now the {{ExecutionConfig}} is directly stored in the {{JobGraph}} which is sent as an Akka message to the {{JobManager}}. Per default, user code types are automatically detected and registered in the {{ExecutionConfig}}. When deserializing a {{JobGraph}} whose {{ExecutionConfig}} contains user code classes the user code class loader is consequently required. However, Akka does not have access to it and uses the system class loader. This causes that Akka silently discards the {{SubmitJob}} message which cannot be deserialized because of a {{ClassNotFoundException}}.
> I propose to not sent the {{ExecutionConfig}} explicitly with the {{JobGraph}} and, thus, to partially revert the changes to before FLINK-3327. Before, the {{ExectuionConfig}} was serialized into the job configuration and deserialized on the {{TaskManager}} using the proper user code class loader.
> In order to reproduce the problem you can submit the following job to a remote cluster.
> {code}
> public class Job {
> 	public static class CustomType {
> 		private final int value;
> 		public CustomType(int value) {
> 			this.value = value;
> 		}
> 		@Override
> 		public String toString() {
> 			return "CustomType(" + value + ")";
> 		}
> 	}
> 	public static void main(String[] args) throws Exception {
> 		ExecutionEnvironment env = ExecutionEnvironment.createRemoteEnvironment(Address, Port, PathToJar);
> 		env.getConfig().disableAutoTypeRegistration();
> 		DataSet<Integer> input = env.fromElements(1,2,3,4,5);
> 		DataSet<CustomType> customTypes = input.map(new MapFunction<Integer, CustomType>() {
> 			@Override
> 			public CustomType map(Integer integer) throws Exception {
> 				return new CustomType(integer);
> 			}
> 		});
> 		customTypes.print();
> 	}
> }
> {code}



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