22011611671
84%

Ran 14 Feb 2026 06:07AM UTC

Jobs 1

Files 61

Run time 1min

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Committed 13 Feb 2026 05:53PM UTC coverage: 84.7% (+0.04%) from 84.661%

Build # 22011611671

Build Type

push

github

Committed by

web-flow

Commit Message

Improved flow control for stream snapshots (#7828)

This PR improves the flow control for stream snapshots:

1. We will now keep a window of slots for in-flight chunks, rather than
counting totals and potentially dropping acks, but still targeting 8MB
in flight at any time
2. We will now wait for a chunk to be filled (or EOF from the
snapshotting goroutine) before sending it rather than opportunistically
sending smaller chunks, providing more stable throughput on the wire
3. Increase the amount of time that we can wait for acks from 2 seconds
to 5 seconds, to better cope with slow connections
4. Give up early in ack reply subscription handlers if we detect that
the process has failed

Signed-off-by: Neil Twigg <neil@nats.io>

Run Details

74835 of 88353 relevant lines covered (84.7%)

325585.3 hits per line

Uncovered Existing Lines

Lines	Coverage	∆	File
2	82.75	0.1%	src/github.com/nats-io/nats-server/server/memstore.go
3	87.88	-0.24%	src/github.com/nats-io/nats-server/server/auth.go
3	86.16	-0.14%	src/github.com/nats-io/nats-server/server/events.go
3	83.25	0.56%	src/github.com/nats-io/nats-server/server/filestore.go
4	87.09	-0.07%	src/github.com/nats-io/nats-server/server/monitor.go
6	93.84	-0.16%	src/github.com/nats-io/nats-server/server/gateway.go
8	79.39	0.04%	src/github.com/nats-io/nats-server/server/opts.go
8	90.07	-0.03%	src/github.com/nats-io/nats-server/server/server.go
22	91.79	-0.8%	src/github.com/nats-io/nats-server/server/route.go
187	88.47	0.49%	src/github.com/nats-io/nats-server/server/raft.go
243	88.35	0.2%	src/github.com/nats-io/nats-server/server/consumer.go
317	73.85	-0.01%	src/github.com/nats-io/nats-server/server/jetstream_api.go
406	86.01	0.04%	src/github.com/nats-io/nats-server/server/stream.go
1070	82.29	-0.3%	src/github.com/nats-io/nats-server/server/jetstream_cluster.go

Jobs

ID	Job ID	Ran	Files	Coverage
1	22011611671.1	14 Feb 2026 06:07AM UTC	61	84.7	GitHub Action Run

nats-io / nats-server / 22011611671
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