Event Hub is receiving event after 15s when using log-to-eventhub policy in APIM

Question

I have exposed service on APIM. What I want is to send the request to Event Hub. When I try to use log-to-event-hub policy the request has been sent to Event Hub but it appears in Event Hub after 15s.

I tried to do the same with send-request policy and request appears immediately in Event Hub after calling service on APIM.

What can be the issue with log-to-eventhub policy?

Event Hubs Namespace is in Standard Tier.

Answer 1

@Marko Ilic Thanks for reaching out. when using log to EventHub policy APIM does not send events instantly. Messages are queued in memory and are flushed every about ~15 seconds. This is not configurable. so, 15-20 second delay is to be expected.

If you want to send instantaneous notification somewhere, you must consider using send-request policy.

do let me know incase of further queries, I would be happy to assist you.

Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.