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