tree e07eb6f6a8097f6191a55e64eab58f7149ab040c
parent 4ca78b58ebeb388c02068806dd074bc8b509c779
author Richard Jankowski <rjankows@ciena.com> 1537205609 -0400
committer khenaidoo Nursimulu <knursimu@ciena.com> 1537210912 +0000

VOL-1183: OFagent cannot reach vcore after vcore moved to different node in cluster

Two gRPC calls made by OFagent's ConnectionManager, Subscribe and ListLogicalDevices, actually
run in the Twisted reactor thread. On rare occasions, either call never returns when the vcore
connected to the OFagent dies. Because the blocking gRPC runs in the reactor thread, the entire
application is blocked and cannot detect comms errors with the deceased vcore. The handling  of
these gRPCs has been moved to the OFagent's internal GrpcClient, which wraps all gRPC calls in
the twisted.internet.threads.deferToThread function.

Change-Id: Ifa3479a3cbca7ae8d7f5e2ca0372e22507d5e4b9