Are Stream sequences monotonically increasing for the life of the stream? #6737
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It seems that sequences are always monotonically increasing for the life of the stream in practice and considering parameters like |
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Indeed the stream sequence is always monotonically increasing. Even if you'd purge the stream of all its data, you'd see the stream gets cleared of its contents but the first sequence moves up such that the sequence stays monotonic. |
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Okay, great, thanks. I wanted to confirm that this was not just observed behavior / implementation detail, but this is an api guarantee. |
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Monotonic increasing sequence is indeed an API guarantee. Only thing to be aware of is that JetStream publishes could timeout, for various reasons but any usual network related issue could trigger a timeout (just like with HTTP really). But if you'd retry a publish you could observe the sequence jumping higher. For example; first publish succeeds and you get sequence 1, then another publish times out, and then another publish succeeds and you get sequence 3. That's normal as well, as the second message was properly persisted (otherwise you wouldn't get sequence 3 in the third publish), but the response didn't get to you hence the timeout. |
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awesome. thanks! |
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Indeed the stream sequence is always monotonically increasing. Even if you'd purge the stream of all its data, you'd see the stream gets cleared of its contents but the first sequence moves up such that the sequence stays monotonic.