[jira] [Commented] (FLINK-1164) Uninformative error message when having an identity iteration with the Scala API

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-1164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170663#comment-14170663 ] 

Aljoscha Krettek commented on FLINK-1164:
-----------------------------------------

This also happens in the Java API. You wrote "identity" mapper, but you meant "Identity Iteration", right? Because when I do

{code}
val result = input.iterate{ in =>
  in.map { x => x}
}
{code}

Which is an identity mapper, it works.

> Uninformative error message when having an identity iteration with the Scala API
> --------------------------------------------------------------------------------
>
>                 Key: FLINK-1164
>                 URL: https://issues.apache.org/jira/browse/FLINK-1164
>             Project: Flink
>          Issue Type: Bug
>            Reporter: Till Rohrmann
>
> If one implements an identity mapper with the Scala API, then one gets a strange error message which might be very confusing for the user: 
> Exception in thread "main" org.apache.flink.runtime.client.JobExecutionException: java.lang.Exception: Failed to deploy the task PartialSolution (BulkIteration (Bulk Iteration)) (1/8) - execution #0 to slot SubSlot 1 (0bbe935796159bfe18abca6f1b32769a (0) - ALLOCATED/ALIVE): java.lang.Exception: The number of writers created in 'registerInputOutput()' is different than the number of connected outgoing edges in the job graph.



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