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Ran 25 Jan 2026 06:02AM UTC

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Committed 23 Jan 2026 03:26PM UTC coverage: 84.723% (+0.2%) from 84.562%

Job # 21327191762.1

Build Type

push

github

Committed by

web-flow

Commit Message

Perform `_writeFullState` under read lock only (#7759)

Previously the `_writeFullState` calls would take the store write lock,
but if the store is very read-heavy with e.g. lots of consumers, this
creates a significant contention on those trying to acquire `RLock` and
results in pauses that may cause caches to expire. Therefore:

- A new `wfsmu` is added to allow only one of these calls to run at a
time — it protects the average delete map length field, and also means
that we can't have two `_writeFullState` goroutines writing to the same
file at the same time;
- The `fs.mu` is now `RLock` instead of `Lock`

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

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