Is the tuple itself not aware of the key fields ? I'm thinking about the file in Malhar:
*demos/machinedata/src/main/java/com/datatorrent/demos/machinedata/operator/CalculatorOperator.java* and the *MachineInfoStreamCodec* in it. Ram On Tue, Apr 26, 2016 at 3:48 AM, Bhupesh Chawda <bhup...@datatorrent.com> wrote: > Hi, > > I am trying to write a stream codec to set on the input port of an > operator which is partitioned. > > The use case is to route incoming tuples to the operator partitions such > that the tuple with the same key goes to the same partition. > > However, the tuple key fields are known only to the operator. Is there a > way I can use this information to construct the StreamCodec such that the > getPartition() method of the codec returns the hashcode of the tuple key > field. > > If this is not possible, then is there a way I can have properties in the > Stream codec and set them externally similar to operator properties? > > Thanks. > > ~Bhupesh >
