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if an origin stream contains: 1M msgs with subject foo and 1M msgs with subject bar IF the source consumer changes their filter from foo to bar Then it would have received messages for subject bar. This happens because this tail was filtered and their respective seqno was not communicated to the consumer. This is somewhat unexpected. It is also coincidental. Had the last message in the stream had subject foo then this wouldn't happen. Therefore, when completely changing the subject say, from foo to bar, we only receive messages received after the time the change was made. However, if the old and new subject overlap in any way, we go by sequence number. Meaning in these cases the outlined behavior remains in order to not induce artificial message loss for the part of the subject space that is covered by old and new filter. Signed-off-by: Matthias Hanel <mh@synadia.com> Signed-off-by: Matthias Hanel <mh@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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