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Select node for a Flink DataStream execution


I have been searching a lot but I didn't found a solution for this.

Lets supose some of the steps on the streaming process must be executed
in just a subset of the available nodes/taskmanagers, while the rest of
the tasks are free to be computed anywhere.

**¿How can I assign a DataStream to be executed ONLY in a node

This is required mainly for input/sink tasks as not every node in the
cluster have the same conectivity / security restrictions.

I'm new on flink, so please forgive me if I'm asking for something

Thanks a lot.

Rafael Leira.

Pd: Currently, we have a static standalone flink cluster.