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Improve performance and latency with large number of sparse consumers. #3706

Merged
merged 1 commit into from Dec 13, 2022
Merged

Improve performance and latency with large number of sparse consumers. #3706

merged 1 commit into from Dec 13, 2022

Commits on Dec 13, 2022

  1. Improve performance and latency with large number of sparse consumers. 

    When a stream had a large number of consumers on a server that were sparse, the signaling mechanism would do a linear scan to signal matching consumers. As usage patterns have continued to have more consumers that are filteres and sparse, meaning a message is destined for a single or small number of consumers.

This change moves selection to a sublist that tracks only active consumer leaders for selection, which optimizes selection of consumers to signal when the number of consumers is large.

Signed-off-by: Derek Collison <derek@nats.io>
    @derekcollison
    derekcollison committed Dec 13, 2022
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