Re: Can ValueState use generics?

[Chesnay Schepler]

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?



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