cameri / nats-server / 35819776001
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coverage: 82.655% (+4.9%) from 77.723%
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[FIXED] Remove stale JetStream account usage after peer removal (#8570)

Fixes #8563.

When a JetStream server is permanently removed from the cluster, its
last reported account usage can remain in `jsAccount.rusage`. Because
that value is still included in the account totals, replacing a stream
replica on another server can cause storage usage to be counted twice.

I reproduced this with a 4-node cluster and an R3 stream. After removing
one of the replica-holding servers and letting the stream move to the
spare node, the stream was still correctly running with 3 replicas, but
the account storage usage increased as if there were 4 copies.

This change removes the departed server's usage when its meta peer
removal is committed. It also ignores a late usage update from the
removed node so that the stale entry cannot be added back after cleanup.

I added a regression test that:

* creates an R3 stream on a 4-node cluster,
* verifies the initial account usage,
* removes one of the servers hosting a replica,
* waits for the replica to move to the spare server,
* verifies the account usage stays unchanged,
* and checks that a late usage update from the removed peer does not
recreate the stale entry.

Testing:

* new regression test passes repeatedly
* regression test passes with `-race`
* related peer-removal and account-usage tests pass
* `go vet ./server`
* `git diff --check`

71441 of 86433 relevant lines covered (82.65%)

316713.07 hits per line

Coverage Regressions

Lines Coverage ∆ File
63
83.18
 -0.29% src/github.com/nats-io/nats-server/server/jetstream_cluster.go
38
79.44
 1.18% src/github.com/nats-io/nats-server/server/raft.go
10
87.64
 0.2% src/github.com/nats-io/nats-server/server/consumer.go
7
55.5
 -0.35% src/github.com/nats-io/nats-server/server/jetstream_errors_generated.go
5
86.45
 7.09% src/github.com/nats-io/nats-server/server/monitor.go
4
73.8
 0.46% src/github.com/nats-io/nats-server/server/jetstream_api.go
3
77.79
 15.3% src/github.com/nats-io/nats-server/server/opts.go
3
84.78
 2.61% src/github.com/nats-io/nats-server/server/route.go
2
86.12
 0.39% src/github.com/nats-io/nats-server/server/accounts.go
2
93.01
 3.34% src/github.com/nats-io/nats-server/server/client.go
2
78.7
 0.16% src/github.com/nats-io/nats-server/server/filestore.go
2
93.76
 0.34% src/github.com/nats-io/nats-server/server/gateway.go
2
98.44
 -1.56% src/github.com/nats-io/nats-server/server/jetstream_versioning.go
2
89.29
 0.99% src/github.com/nats-io/nats-server/server/server.go
2
86.13
 0.75% src/github.com/nats-io/nats-server/server/stream.go
Jobs
ID Job ID Ran Files Coverage
1 35819776001.1 66
82.65
 GitHub Action Run
Source Files on build 35819776001