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From Chesnay Schepler <ches...@apache.org>
Subject Re: Can ValueState use generics?
Date Mon, 08 May 2017 11:11:05 GMT
If you want to use generics you have to either provide a TypeInformation 
instead of a class or create a class that extends Tuple2(Integer, 
ObjectNode) and use it as the class argument.

On 07.05.2017 15:14, yunfan123 wrote:
> My process function is like :
>
>      private static class MergeFunction extends
> RichProcessFunction<Tuple2&lt;Integer, ObjectNode>, Tuple2<Integer,
> ObjectNode>> {
>
>          private ValueState<Tuple2&lt;Integer, ObjectNode>> state;
>
>          @Override
>          @SuppressWarnings("unchecked")
>          public void open(Configuration parameters) throws Exception {
>              state = getRuntimeContext().getState(new
> ValueStateDescriptor<>("mystate",
>                      (Class<Tuple2&lt;Integer,ObjectNode>>)
> (Object)Tuple2.class));
>          }
> }
>
>
> When I running the code:
> 05/07/2017 21:17:47	Process -> (Sink: Unnamed, Sink: Unnamed)(1/1) switched
> to FAILED
> java.lang.RuntimeException: Cannot create full type information based on the
> given class. If the type has generics, please
> 	at
> org.apache.flink.api.common.state.StateDescriptor.<init>(StateDescriptor.java:124)
> 	at
> org.apache.flink.api.common.state.ValueStateDescriptor.<init>(ValueStateDescriptor.java:101)
> 	at
> com.bytedance.flinkjob.activationSource.AppActivationSource$MergeFunction.open(AppActivationSource.java:134)
> 	at
> org.apache.flink.api.common.functions.util.FunctionUtils.openFunction(FunctionUtils.java:36)
> 	at
> org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.open(AbstractUdfStreamOperator.java:112)
> 	at
> org.apache.flink.streaming.api.operators.ProcessOperator.open(ProcessOperator.java:55)
> 	at
> org.apache.flink.streaming.runtime.tasks.StreamTask.openAllOperators(StreamTask.java:375)
> 	at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:251)
> 	at org.apache.flink.runtime.taskmanager.Task.run(Task.java:665)
> 	at java.lang.Thread.run(Thread.java:745)
> Caused by: org.apache.flink.api.common.functions.InvalidTypesException:
> Tuple needs to be parameterized by using generics.
> 	at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfoWithTypeHierarchy(TypeExtractor.java:673)
> 	at
> org.apache.flink.api.java.typeutils.TypeExtractor.privateCreateTypeInfo(TypeExtractor.java:607)
> 	at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:561)
> 	at
> org.apache.flink.api.java.typeutils.TypeExtractor.createTypeInfo(TypeExtractor.java:557)
> 	at
> org.apache.flink.api.common.state.StateDescriptor.<init>(StateDescriptor.java:122)
> 	... 9 more
>
> Can I use generics with ValueState?
>
>
>
> --
> View this message in context: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/Can-ValueState-use-generics-tp13038.html
> Sent from the Apache Flink User Mailing List archive. mailing list archive at Nabble.com.
>


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