Watching Alper Rifat Ulucinar talk about CRDs. #KubeCon
Some of the Crossplane providers for cloud platforms have hundreds of CRDs. #KubeCon
One of the issues they’ve run into with lots of CRDs installed is client side (kubectl) throttling. #KubeCon
This is related to the client-go discovery client, which uses a Token Bucket Rate Limiter (tblr). In k8s 1.23 there was a configuration bug that limited the queries per second, it was much lower than intended. #KubeCon
kubectl uses a CachedDiscoveryClient. The cache has a Time To Live. #KubeCon
The default TTL was increased to 6 hours in 1.24. #KubeCon
They also encountered problems with high CPU and memory utilization from the API server. #KubeCon
They did cpu profiling and found a lot of cpu time talking to the OpenAPI v2 and endpoint. Also a lot of time doing JSON marshalling/unmarshalling. #KubeCon
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