Competing consumers and RETRY

[Robert Goheen]

Hello:

I was trying to find some information on the behaviour of event store when a competing consumer ACKs a message with RETRY.  With a little testing, it seems the event gets picked back up by another consumer pretty much immediately.  How is this message handled on the server in terms of it being re-queued?  And are there any settings around this behaviour, such as setting a delay so there is some time between one consumer failing to fully process the event and another consumer reading it in again?

Thanks!

Robert Goheen

[Greg Young]

Hmm there is not as of now. This could be an *interesting* feature to add though and not horrific depending on implementation...

I see two major options here. 

The first would be "best effort retry after short period of time say up to minutes or hours". 

The second would be "assured retry after long period of time" say next Thursday. 

The first would be relatively easy to implement, the second much less so (and it can be implemented for your problem relatively easily today using parking!). The first I can likely have a pull request done this week for ... the second would likely require days to weeks of work (needs persistent scheduling as an example!).

Are you looking for a short-term best-effort retry-after or a  long-term assured retry-after?

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