It throws by
if (!type.isTupleType()) {
throw new InvalidProgramException("Specifying
keys via field positions is only valid " +
"for tuple data types. Type: "
+ type);
}
So, like Saikat saying, you may need a stream with tuples, because
public interface ReduceFunction<T> extends Function, Serializable {
/**
* The core method of ReduceFunction, combining two values into one
value of the same type.
* The reduce function is consecutively applied to all values of a
group until only a single value remains.
*
* @param value1 The first value to combine.
* @param value2 The second value to combine.
* @return The combined value of both input values.
*
* @throws Exception This method may throw exceptions. Throwing an
exception will cause the operation
* to fail and may trigger recovery.
*/
T reduce(T value1, T value2) throws Exception;
}
Thanks
Chenguang He
Graduate Student
Department of Computer Science
Iowa State University
On April 18, 2016 at 1:30:19 PM, Saikat Maitra ([email protected]) wrote:
Hello Jitendra,
I am new to Flink community but may have seen this issue earlier. Can you
try to use DataStream<Tuple1<Integer>> instead of KeyedStream integers4
Regards Saikat
On Mon, Apr 18, 2016 at 7:37 PM, Jitendra Agrawal <
[email protected]> wrote:
> Hi Team,
>
> Problem Description : When I was calling *reduce()* method on keyedStream
> object then getting Ecxeption as
>
> "* org.apache.flink.api.common.InvalidProgramException: Specifying keys via
> field positions is only valid for tuple data types. Type: Integer*".
>
> StreamExecutionEnvironment env =
> StreamExecutionEnvironment.getExecutionEnvironment();
> KeyedStream integers4 = env.fromElements(1,2,3).keyBy(0);
> DataStream doubleIntegers4 = integers4.reduce(new
> ReduceFunction<Integer>() {
>
> @Override
> public Integer reduce(Integer arg0, Integer arg1) throws Exception {
> return arg0 + arg1;
> }
> });
>
>
> can you please tell me how to solve this exception? or can you provide any
> link or example where I get these complete Solution..
>
> your help will be appreciated..
>
> Thanks & Regards
>
> *Jitendra Agrawal *
>
> Mumbai
>
> 9167539602
>
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