Hi Aaron,

Could you share the code of you custom function?

I am also adding Aljosha and Kostas to cc, who should be more helpful on
that topic.

Best,

Dawid

On 19/10/2018 20:06, Aaron Levin wrote:
> Hi,
>
> I'm writing a custom `SourceFunction` which wraps an underlying
> `InputFormatSourceFunction`. When I try to use this `SourceFunction`
> in a stream (via `env.addSource` and a subsequent sink) I get errors
> related to the `InputSplitAssigner` not being initialized for a
> particular vertex ID. Full error here[1].
>
> I believe the underlying error is related to this[0] call to
> `instanceof InputFormatSourceFunction`.
>
> _My questions_:
>
> 1. how can I wrap a `InputFormatSourceFunction` which avoids this
> error? Am I missing a chunk of the API covering this?
> 2. is the error I'm experience related to that casting call? If so,
> would ya'll be open to a PR which adds an interface one can extend
> which will set the input format in the stream graph? Or is there a
> preferred way of achieving this?
>
> Thanks!
>
> Aaron Levin
>
> [0] 
> https://github.com/apache/flink/blob/release-1.6/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/graph/StreamGraphGenerator.java#L480
> [1] 
> java.lang.RuntimeException: Could not retrieve next input split.
>     at
> org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction$1.hasNext(InputFormatSourceFunction.java:157)
>     at
> org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction.open(InputFormatSourceFunction.java:71)
>     at REDACTED
>     at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
>     at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:102)
>     at
> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:424)
>     at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:290)
>     at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711)
>     at java.lang.Thread.run(Thread.java:748)
> Caused by:
> org.apache.flink.runtime.jobgraph.tasks.InputSplitProviderException:
> Requesting the next input split failed.
>     at
> org.apache.flink.runtime.taskexecutor.rpc.RpcInputSplitProvider.getNextInputSplit(RpcInputSplitProvider.java:69)
>     at
> org.apache.flink.streaming.api.functions.source.InputFormatSourceFunction$1.hasNext(InputFormatSourceFunction.java:155)
>     ... 8 more
> Caused by: java.util.concurrent.ExecutionException:
> java.lang.Exception: No InputSplitAssigner for vertex ID
> cbc357ccb763df2852fee8c4fc7d55f2
>     at
> java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
>     at
> java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1915)
>     at
> org.apache.flink.runtime.taskexecutor.rpc.RpcInputSplitProvider.getNextInputSplit(RpcInputSplitProvider.java:61)
>     ... 9 more
> Caused by: java.lang.Exception: No InputSplitAssigner for vertex ID
> cbc357ccb763df2852fee8c4fc7d55f2
>     at
> org.apache.flink.runtime.jobmaster.JobMaster.requestNextInputSplit(JobMaster.java:575)
>     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>     at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>     at java.lang.reflect.Method.invoke(Method.java:498)
>     at
> org.apache.flink.runtime.rpc.akka.AkkaRpcActor.handleRpcInvocation(AkkaRpcActor.java:247)
> ...

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