Github user soniclavier commented on the issue:
https://github.com/apache/flink/pull/2051
Thanks Ufuk & Stephen for the reply,
I tried the serializers suggested by you
```
val typeHint = new TypeHint[Tuple2[Long,String]](){}
val serializer = TypeInformation.of(typeHint).createSerializer(null)
//also tried this
val fieldSerializers = Array[TypeSerializer[_]](StringSerializer.INSTANCE,
LongSerializer.INSTANCE)
val serializer2 = new
TupleSerializer(classOf[Tuple2[Long,String]].asInstanceOf[Class[_]].asInstanceOf[Class[Tuple2[String,
Long]]], fieldSerializers)
```
But both gives me compilation error at
```
val serializedKey = KvStateRequestSerializer.serializeKeyAndNamespace(
key,
serializer2,
VoidNamespace.INSTANCE,
VoidNamespaceSerializer.INSTANCE)
```
the compilation error is:
```
Error:(43, 7) type mismatch;
found :
org.apache.flink.api.common.typeutils.TypeSerializer[org.apache.flink.api.java.tuple.Tuple2[Long,String]]
required:
org.apache.flink.api.common.typeutils.TypeSerializer[java.io.Serializable]
Note: org.apache.flink.api.java.tuple.Tuple2[Long,String] <:
java.io.Serializable, but Java-defined class TypeSerializer is invariant in
type T.
You may wish to investigate a wildcard type such as `_ <:
java.io.Serializable`. (SLS 3.2.10)
serializer,
^
```
I had seen this before when I tried to set the serializer from
`queryableState.getKeySerializer`
Note : It works fine when I use the longer version of serializer that I
created.
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