Commit 6042b5d2 authored by Jeremy Lau's avatar Jeremy Lau Committed by TensorFlower Gardener
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Reject retried RecvTensor requests. 

Retried RecvTensorRequests are problematic because a RecvTensor with no
corresponding sender will wait forever, and the tensor may have been delivered
to a previous retry.

This change adds a unique request_id to each RecvTensor request, and we check
these request_ids against a set of recent request_ids. If a request_id is in the
recent set, we reject the RecvTensor request.

PiperOrigin-RevId: 182863245
parent 2968447d
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