371ce36712
This is more of a regression introduced in v2.7.3 (with PR #2848). When the store has a list of subjects, finding the next message to deliver would go through the subjects map and have to match to find out if it is a subset (if the filter had a wildcard). In situations where there were lots of subjects (for instance 1 message per subject), but the consumer did not filter on anything specific, then this processing was becoming slow. We now check that if the stream has a single subject (even with wildcard) and the consumer filters on that exact subject, then we can do a linear scan. We also do a linear scan if the number of messages in the block is 1/2 the number of subjects in the subjects map. Signed-off-by: Ivan Kozlovic <ivan@synadia.com>
NATS is a simple, secure and performant communications system for digital systems, services and devices. NATS is part of the Cloud Native Computing Foundation (CNCF). NATS has over 40 client language implementations, and its server can run on-premise, in the cloud, at the edge, and even on a Raspberry Pi. NATS can secure and simplify design and operation of modern distributed systems.
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License
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