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Chris Lu
fe9ca35bbd
mount: tier-2 chunk directory + FetchChunk streaming on one gRPC port Collapses the old two-port design (HTTP peer-serve + separate gRPC directory) into a single gRPC service that handles every mount-to- mount exchange: ChunkAnnounce, ChunkLookup, and the new FetchChunk byte stream. * peer_directory.go: fid -> holders shard, HRW-gated; returns holders in LRU order; capacity-bounded; Sweep handles eviction under write-lock while Lookup runs under RLock (hot path is concurrent). * peer_grpc.go: single MountPeer gRPC server implementing all three RPCs. FetchChunk frames bytes at 1 MiB per Send so the default 4 MiB message cap does not constrain chunk size; cache miss returns gRPC NOT_FOUND so clients distinguish miss from transport error. Reuses pb.NewGrpcServer for consistent keepalive + msg-size tuning. * peer_bytepool.go: sync.Pool wrapper around *[]byte that the server uses to avoid a fresh 8 MiB allocation per FetchChunk call. * WFS wiring starts the gRPC server on option.PeerListen (the single peer port) using the advertise address resolved in PR #3 as the HRW identity. A background sweeper evicts expired directory entries every 60 s.