38852421690
75%

Ran 16 Oct 2026 05:53AM UTC

Jobs 1

Files 66

Run time 1min

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Committed 15 Oct 2026 06:16AM UTC coverage: 79.308% (+1.6%) from 77.715%

Build # 38852421690

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

69804 of 88016 relevant lines covered (79.31%)

298796.23 hits per line

Coverage Regressions

Lines	Coverage	∆	File
720	83.87	0.21%	src/github.com/nats-io/nats-server/server/jetstream_cluster.go
569	76.98	-0.55%	src/github.com/nats-io/nats-server/server/raft.go
555	85.77	0.14%	src/github.com/nats-io/nats-server/server/stream.go
477	60.75	1.01%	src/github.com/nats-io/nats-server/server/reload.go
328	85.71	-0.27%	src/github.com/nats-io/nats-server/server/accounts.go
316	87.39	-0.21%	src/github.com/nats-io/nats-server/server/consumer.go
202	89.94	0.27%	src/github.com/nats-io/nats-server/server/client.go
185	84.64	0.63%	src/github.com/nats-io/nats-server/server/events.go
94	87.73	1.21%	src/github.com/nats-io/nats-server/server/auth.go
86	89.37	-0.11%	src/github.com/nats-io/nats-server/server/leafnode.go
68	93.99	-0.13%	src/github.com/nats-io/nats-server/server/gateway.go
60	77.63	-0.51%	src/github.com/nats-io/nats-server/server/filestore.go
49	88.57	0.01%	src/github.com/nats-io/nats-server/server/server.go
18	82.04	-0.24%	src/github.com/nats-io/nats-server/server/memstore.go
7	82.1	0.15%	src/github.com/nats-io/nats-server/server/auth_callout.go
6	63.77	0.83%	src/github.com/nats-io/nats-server/server/opts.go
4	73.73	0.38%	src/github.com/nats-io/nats-server/server/jetstream_api.go
3	86.44	6.45%	src/github.com/nats-io/nats-server/server/monitor.go
2	81.98	-0.09%	src/github.com/nats-io/nats-server/server/route.go

Jobs

ID	Job ID	Ran	Files	Coverage
1	38852421690.1	16 Oct 2026 05:53AM UTC	66	79.31	GitHub Action Run

nats-io / nats-server / 38852421690
75%

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nats-io / nats-server / 38852421690 75%

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nats-io / nats-server / 38852421690
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