Hi,
The issue is that this problem appears when I want to create a stream source.
StreamExecutionEnvironment.addSource(new MySourceFunction())
…
Where the stream source class is
MySourceFunction<TupleEvent2> implements SourceFunction<TupleEvent2>
{
…
}
In such a case I am not sure how I can pass the outertype nor how I can pass
it using the “.returns()” method as Timo suggested
Dr. Radu Tudoran
Research Engineer - Big Data Expert
IT R&D Division
[cid:[email protected]]
HUAWEI TECHNOLOGIES Duesseldorf GmbH
European Research Center
Riesstrasse 25, 80992 München
E-mail: [email protected]
Mobile: +49 15209084330
Telephone: +49 891588344173
HUAWEI TECHNOLOGIES Duesseldorf GmbH
Hansaallee 205, 40549 Düsseldorf, Germany,
www.huawei.com<http://www.huawei.com/>
Registered Office: Düsseldorf, Register Court Düsseldorf, HRB 56063,
Managing Director: Bo PENG, Wanzhou MENG, Lifang CHEN
Sitz der Gesellschaft: Düsseldorf, Amtsgericht Düsseldorf, HRB 56063,
Geschäftsführer: Bo PENG, Wanzhou MENG, Lifang CHEN
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From: Wang Yangjun [mailto:[email protected]]
Sent: Tuesday, March 08, 2016 7:15 PM
To: [email protected]
Subject: Re: ype of TypeVariable could not be determined
Hi Radu,
I met this issue also. The reason is outTypeInfo couldn't be created base on
generic type when a transform applied.
public <R> SingleOutputStreamOperator<R, ?> transform(String operatorName,
TypeInformation<R> outTypeInfo, OneInputStreamOperator<T, R> operator)
The solution would be passed Calss<T> to your UDF and create TypeInfomation<R>
by yourself.
Best,
Jun
From: Radu Tudoran <[email protected]<mailto:[email protected]>>
Reply-To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Date: Tuesday 8 March 2016 at 19:57
To: "[email protected]<mailto:[email protected]>"
<[email protected]<mailto:[email protected]>>
Subject: ype of TypeVariable could not be determined
Hi,
I am trying to create a custom stream source. I first build this with generic
and I run into problems regarding type extraction. I tried to put concrete
types but run into the same issue (see errors below). Can anyone provide a
solution to solve this issue.
Caused by: org.apache.flink.api.common.functions.InvalidTypesException: Type of
TypeVariable 'IN' in 'class test.MySourceFunction' could not be determined.
This is most likely a type erasure problem. The type extraction currently
supports types with generic variables only in cases where all variables in the
return type can be deduced from the input type(s).
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:498)
at
org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:380)
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:346)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1152)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1107)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1089)
... 1 more
Caused by: org.apache.flink.api.common.functions.InvalidTypesException: Type of
TypeVariable 'TupleEvent2' in 'class test.MySourceFunctionTuple' could not be
determined. This is most likely a type erasure problem. The type extraction
currently supports types with generic variables only in cases where all
variables in the return type can be deduced from the input type(s).
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:498)
at
org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:380)
at
org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:346)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1152)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1107)
at
org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.addSource(StreamExecutionEnvironment.java:1089)
... 1 more
Dr. Radu Tudoran
Research Engineer - Big Data Expert
IT R&D Division
[cid:[email protected]]
HUAWEI TECHNOLOGIES Duesseldorf GmbH
European Research Center
Riesstrasse 25, 80992 München
E-mail: [email protected]<mailto:[email protected]>
Mobile: +49 15209084330
Telephone: +49 891588344173
HUAWEI TECHNOLOGIES Duesseldorf GmbH
Hansaallee 205, 40549 Düsseldorf, Germany,
www.huawei.com<http://www.huawei.com/>
Registered Office: Düsseldorf, Register Court Düsseldorf, HRB 56063,
Managing Director: Bo PENG, Wanzhou MENG, Lifang CHEN
Sitz der Gesellschaft: Düsseldorf, Amtsgericht Düsseldorf, HRB 56063,
Geschäftsführer: Bo PENG, Wanzhou MENG, Lifang CHEN
This e-mail and its attachments contain confidential information from HUAWEI,
which is intended only for the person or entity whose address is listed above.
Any use of the information contained herein in any way (including, but not
limited to, total or partial disclosure, reproduction, or dissemination) by
persons other than the intended recipient(s) is prohibited. If you receive this
e-mail in error, please notify the sender by phone or email immediately and
delete it!
