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Short term: Maybe a admin endpoint to force catalog refresh could be nice (so one could port forward to the pod and trigger refresh)?

It could be doable, maybe by restricting traffic to localhost only and providing a convenience sh script within the image. But I'm not sure that's worth it and more usable than deleting the pod

Long term: Would have to think about some solution to keep replicas in sync. Maybe you have some ideas.

I think for that it will be partly related to #359.
I think implementing some distributed cache like redis may be overkill but having the catalog served internally by the API or by a side pod / container may solve refresh inconsistencies by having the catalog set to a specific docker image tag for example

One possible way to deal with multiple pod with less pain could be https://medium.com/@bectorhimanshu/how-to-create-a-scheduled-task-using-a-cron-job-in-spring-boot-a1987e679d60 a cron task to plan a refrehs of catalogs at same time on all pods.

If a pod restart and in the same time catalogs were updated between two cron executions, there is no magic unless you deal with some kind of creation timestamp in helm metadata, probably overkill regarding the risks

Still another way little more tricky but will completely answer the need is to add a distributed cache solution in spingboot. One could be https://infinispan.org/docs/stable/titles/spring_boot/starter.html.

the embedded mode need no installation of redis or persistent caching solution, the embedded mode need a springboot configuration and the pods speak with each others to manage the same cache. As helm chart is for me not a heavy load of cache it could probably be a solution.

In this case the logic is not the same you configure a timeout on the cache and first pod that call the cache if timeout is reached will refresh the cache.