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Chris Lu
85470416cb
* volume: overlap the local needle write with the replica fan-out ReplicatedWrite wrote the needle to local disk and then fanned it out to the replicas serially, so a replicated write cost local + replicas. The needle is already fully buffered, so the two can run at once. Snapshot the fields the fan-out reads first (the local write stamps the volume TTL and updates needle flags, so the replica goroutine must not touch the shared needle), then run the local write and the replica fan-out concurrently and ack only after both. Where local disk and replica network are separate resources the write latency drops to max(local, replicas) instead of their sum; co-located on one disk the two writes contend, so this helps distributed placements, not single-host tests. * volume: return the local isUnchanged from the write goroutine * volume: trim overlap-write comments * volume-rs: overlap the replica fan-out with the local needle write * volume: test the overlapped local write and replica fan-out * volume: decode replica pairs only when replicas exist A single-copy or incoming replicate write never uses the decoded pair map, so a malformed Pairs blob only burned an error counter and a log line. Gate the decode on replicaCount. * volume: release the stalled replica on test failure paths An early t.Fatal left the httptest handler blocked on releaseReplica, so the deferred Close hung instead of reporting the failure. Release idempotently ahead of the server close. * test: mismatched If-None-Match serves the object over If-Modified-Since The precedence case asserted the old If-Modified-Since-first ordering and expected 304. The volume servers now evaluate If-None-Match first, so a non-matching tag must return 200 with the body even when If-Modified-Since would allow 304 (RFC 9110 13.1.3).