Speed up check_kubernetes_service_replication #4020
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grr, i forgot that make test doesn't run mypy for some reason |
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huh, what are our tests doing - mypy is showing me that this should have definitely broken some of the other checkers (e.g., the flink one) |
At some point this ran in <1min, and we have >1 things assuming this is still running in <1min...but the current version of this script actually takes multiple minutes in most of our clusters. I grabbed a couple flamegraphs of the current version of this (which I've since lost in my scrollback/browser history, but I can re-gen pretty easily) and noticed a couple obvious things: * we spend a significant amount of time getting pods - let's parallelize that! Note: we do this with multiprocessing and not multithreading since there's a lot of serialization happening of k8s objects that would likely hold onto the GIL * we were spending an obscene amount of time in filter_pods_by_service_instance() since we were calling it over and over again - let's group pods once in a smarter way and pass the grouping around instead :) * this one is kinda ???: socket.gethostbyaddr() was pretty prominent in the flamegraphs - we don't actually use the hostnames in this check, so let's add a way to skip that hostname resolution I also deleted the --additional-namespaces code since it's entirely unused now and it made things slightly cleaner.
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EvanKrall
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Mar 18, 2025
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At some point this ran in <1min, and we have >1 things assuming this is still running in <1min...but the current version of this script actually takes multiple minutes in most of our clusters.
I grabbed a couple flamegraphs of the current version of this (which I've since lost in my scrollback/browser history, but I can re-gen pretty easily) and noticed a couple obvious things:
I also deleted the --additional-namespaces code since it's entirely unused now and it made things slightly cleaner.
EDIT: I regenerated the flamegraphs: