make parameters status shared by all PartitionedParameterCoordinator instances #3380
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There could be multiple PartitionedParameterCoordinator instances, yet they currently manage the parameters in a standalone manner. Let's say we have PartitionedParameterCoordinator A and B. When A puts some parameters inflight, B is not aware of that and when B tries to use these parameters it will just error out. This PR addresses this issue by making the __InflightParamRegistry shared among all PartitionedParameterCoordinator instances.
This PR fixes #3068 and hopefully would fix #3156 as well 😉