An event processor fell behind the tail end of the event store cache. This usually indicates a badly performing event processor

Axon Framework
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1

Hi,

Since recently we’re getting a lot of “An event processor fell behind the tail end of the event store cache. This usually indicates a badly performing event processor.” errors in our logs. The application is not processing a lot of events.
We’re using AxonFramework 4.5.3, springboot 2.5.x and Jpa Storage engine (SAP Hana database).
We’re running on SAP Cloud Platform (a SAP customized implementation of CloudFoundry)
Any clues on how to resolve this issue? Where does it come from and how to fix it.

Thanks,

Danny

2

Hi Danny,

It seems like the event handlers are performing slowly. The event handler implementation can use some type of monitoring. You can use drop wizard or micrometer metrics to be able to see if the event handlers are slow. That might give a better idea of what might be occurring. You may also want to take a quick look at this part of the documentation for additional help.