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Chris Lu
6206f60032
* fix(master): let the growth initiator wait for the growth it triggered The growth-in-flight shed also fired on the request that initiated the growth: it sets the pending flag right before the shed check, so a cold-start assign enqueued growth and immediately failed itself with "volume growth in progress". With no concurrent assigns around to pick up the freshly grown volume, a single writer against an empty cluster never completes a write despite ample free space. Claim the pending flag with a compare-and-swap so exactly one request becomes the initiator, triggering growth at most once, and let it wait for that growth to land. Everyone else still sheds retryably instead of pinning a goroutine: followers behind an in-flight growth, an initiator whose growth concluded without yielding a writable volume, and an initiator whose growth outlives the 10s wait budget, which previously surfaced a non-retryable error (gRPC Unknown, HTTP 406) even though a retry would have succeeded moments later. * fix(master): stop assign waits when the request is cancelled The assign retry loops slept through client cancellation, keeping a goroutine spinning for the rest of the 10s budget after the caller had gone; StreamAssign also ran assigns on a background context detached from the stream. Wait on the request context and pass the stream context through. * topology: drop the unconditional grow-request setter Growth is only claimed through AddGrowRequestIfAbsent's compare-and-swap now; keeping the raw Store(true) around invites the check-then-set race back. * test: cover cold-start first write with a real cluster Boot a fresh master plus three empty volume servers and require the very first assign - HTTP and gRPC, each on a cold volume layout, no client retries - to complete a write. The assign that triggers volume growth must wait for it rather than answering "volume growth in progress"; unit tests stub the topology, so only a real cluster exercises the assign-grow-wait path end to end.