Derek Collison 855f790e3c 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>

2022-12-13 10:09:59 -08:00

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