The master delivers the initial LockRingUpdate once, on connect. Registering the
callback after KeepConnectedToMaster started left a window where that first
update could arrive before the handler was set and be dropped, delaying the ring
view until the next membership change. Build the lock client and register the
callback in the masters block before launching the loop; the filers block reuses
that client (or creates a plain one when no masters are configured).
Chris Lu
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