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Ran 29 Jul 2024 05:36AM UTC

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Committed 29 Jul 2024 04:40AM UTC coverage: 85.162% (+0.08%) from 85.085%

Job # 10138220468.1

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push

github

Committed by

web-flow

Commit Message

[IMPROVED] LoadNextMsg for wildcard consumers with millions of subjects (#5710)

When LoadNextMsg misses, make sure to consult psim but conservatively.

We had a use case with millions of subjects and the last sequence
checked being in the next to the last block. The consumer had a wildcard
that matched lots of entries that were behind where we were. This would
burn alot of cpu and when a stream had lots of consumers and they shift
leadership this would introduce some instability due to all the cpu
cycles.

Signed-off-by: Derek Collison <derek@nats.io>

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