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https://issues.apache.org/jira/browse/FLINK-21876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-21876:
-----------------------------------
Labels: auto-unassigned stale-major (was: auto-unassigned)
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Major but is unassigned and neither itself nor its Sub-Tasks have been updated
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> Handle it properly when the returned value of Python UDF doesn't match the
> defined result type
> ----------------------------------------------------------------------------------------------
>
> Key: FLINK-21876
> URL: https://issues.apache.org/jira/browse/FLINK-21876
> Project: Flink
> Issue Type: Improvement
> Components: API / Python
> Affects Versions: 1.10.0, 1.11.0, 1.12.0
> Reporter: Dian Fu
> Priority: Major
> Labels: auto-unassigned, stale-major
> Fix For: 1.14.0, 1.12.5
>
>
> Currently, when the returned value of Python UDF doesn't match the defined
> result type of the Python UDF, it will thrown the following exception during
> execution:
> {code:java}
> Caused by: java.io.EOFException
> at java.io.DataInputStream.readFully(DataInputStream.java:197)
> at java.io.DataInputStream.readFully(DataInputStream.java:169)
> at
> org.apache.flink.table.runtime.typeutils.StringDataSerializer.deserializeInternal(StringDataSerializer.java:88)
> at
> org.apache.flink.table.runtime.typeutils.StringDataSerializer.deserialize(StringDataSerializer.java:82)
> at
> org.apache.flink.table.runtime.typeutils.StringDataSerializer.deserialize(StringDataSerializer.java:34)
> at
> org.apache.flink.table.runtime.typeutils.serializers.python.MapDataSerializer.deserializeInternal(MapDataSerializer.java:129)
> at
> org.apache.flink.table.runtime.typeutils.serializers.python.MapDataSerializer.deserialize(MapDataSerializer.java:110)
> at
> org.apache.flink.table.runtime.typeutils.serializers.python.MapDataSerializer.deserialize(MapDataSerializer.java:46)
> at
> org.apache.flink.table.runtime.typeutils.serializers.python.RowDataSerializer.deserialize(RowDataSerializer.java:106)
> at
> org.apache.flink.table.runtime.typeutils.serializers.python.RowDataSerializer.deserialize(RowDataSerializer.java:49)
> at
> org.apache.flink.table.runtime.operators.python.scalar.RowDataPythonScalarFunctionOperator.emitResult(RowDataPythonScalarFunctionOperator.java:81)
> at
> org.apache.flink.streaming.api.operators.python.AbstractPythonFunctionOperator.emitResults(AbstractPythonFunctionOperator.java:250)
> at
> org.apache.flink.streaming.api.operators.python.AbstractPythonFunctionOperator.invokeFinishBundle(AbstractPythonFunctionOperator.java:273)
> at
> org.apache.flink.streaming.api.operators.python.AbstractPythonFunctionOperator.processWatermark(AbstractPythonFunctionOperator.java:199)
> at
> org.apache.flink.streaming.runtime.tasks.ChainingOutput.emitWatermark(ChainingOutput.java:123)
> at
> org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask$AsyncDataOutputToOutput.emitWatermark(SourceOperatorStreamTask.java:170)
> at
> org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask.advanceToEndOfEventTime(SourceOperatorStreamTask.java:110)
> at
> org.apache.flink.streaming.runtime.tasks.SourceOperatorStreamTask.afterInvoke(SourceOperatorStreamTask.java:116)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:589)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:755)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:570)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> The exception isn't straight forward for users and it's difficult for users
> to figure out the root cause of the issue.
> As Python is dynamic language, this case should be very common and it would
> be great if we could handle this case properly.
> See
> [https://stackoverflow.com/questions/66687797/pyflink-java-io-eofexception-at-java-io-datainputstream-readfully]
> for more details.
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