39201536505
75%

Ran 19 Oct 2026 05:57AM UTC

Jobs 1

Files 66

Run time 1min

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Committed 15 Oct 2026 06:16AM UTC coverage: 77.091% (-3.4%) from 80.449%

Build # 39201536505

Build Type

push

github

Committed by

web-flow

Commit Message

(2.15) [FIXED] Scale up from R1 and scale down stalling on learners (#8762)

Scale down would wait for new peers (learners) to be added before
selecting the scale down peers. Selecting the scale down peers first can
remove the need to add, or wait for, (as many) learners.

Additionally, when scaling up from R1 with writes outpacing replication,
the learner would only be added once fully caught up. Since R1 quorum is
instant, as it doesn't wait on the network, the learner could keep
trailing and never be added. The first learner is now added after at
most 10s. Catchup is usually much faster than that, but in such a
pathological scenario this needs to be bounded to provide backpressure.

Coverage Stats

67852 of 88016 relevant lines covered (77.09%)

290225.64 hits per line

Coverage Regressions

Lines	Coverage	∆	File
2084	23.62	-52.71%	src/github.com/nats-io/nats-server/server/mqtt.go
442	69.99	-16.38%	src/github.com/nats-io/nats-server/server/monitor.go
203	72.45	-9.59%	src/github.com/nats-io/nats-server/server/memstore.go
66	77.04	-0.88%	src/github.com/nats-io/nats-server/server/raft.go
39	63.11	-0.86%	src/github.com/nats-io/nats-server/server/opts.go
34	8.11	-91.89%	src/github.com/nats-io/nats-server/server/monitor_sort_opts.go
28	63.36	-2.62%	src/github.com/nats-io/nats-server/server/websocket.go
27	54.72	-16.98%	src/github.com/nats-io/nats-server/server/log.go
25	73.48	-0.41%	src/github.com/nats-io/nats-server/server/jetstream_api.go
23	89.7	-0.48%	src/github.com/nats-io/nats-server/server/client.go
22	83.82	0.0%	src/github.com/nats-io/nats-server/server/jetstream_cluster.go
21	59.5	-1.25%	src/github.com/nats-io/nats-server/server/reload.go
18	85.62	-0.25%	src/github.com/nats-io/nats-server/server/stream.go
14	86.57	-1.16%	src/github.com/nats-io/nats-server/server/auth.go
14	83.98	-0.56%	src/github.com/nats-io/nats-server/server/events.go
12	70.49	-19.67%	src/github.com/nats-io/nats-server/server/feature_flags.go
12	78.15	0.47%	src/github.com/nats-io/nats-server/server/filestore.go
11	88.49	-0.33%	src/github.com/nats-io/nats-server/server/server.go
8	82.77	-1.08%	src/github.com/nats-io/nats-server/server/parser.go
4	84.63	0.05%	src/github.com/nats-io/nats-server/server/jetstream.go
2	72.73	0.0%	src/github.com/nats-io/nats-server/server/avl/seqset.go
2	87.59	0.13%	src/github.com/nats-io/nats-server/server/consumer.go
2	89.76	-0.19%	src/github.com/nats-io/nats-server/server/sublist.go
2	85.92	-0.47%	src/github.com/nats-io/nats-server/server/util.go

Jobs

ID	Job ID	Ran	Files	Coverage
1	39201536505.1	19 Oct 2026 05:57AM UTC	66	77.09	GitHub Action Run

nats-io / nats-server / 39201536505
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nats-io / nats-server / 39201536505 75%

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