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# opals
Slackbot
02/17/2023, 3:48 AMThis message was deleted.
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Or Weis
02/17/2023, 6:33 AMHi @Sumesh Sukumaran,
Yiu can potentially store millions of user entries in OPA, it depends on how many attributes you have per one. If you're talking just unique ids in a hash map it will likely work.
I'm not sure what you mean by a centralized OPA cache. The cache in OPA is its own memory.
You can have OPAL fetch data from wherever you want into OPA. Including from a centralized source of course.
You can also use http.send in your rego policies, but in general I wouldn't recommend it, as it has great potential of hurting system stability and performance.
opal 1
Or Weis
02/17/2023, 6:36 AMIf you run into memory limitations in OPA you can shard the information between multiple OPA instances via OPAL topics
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Sumesh Sukumaran
02/17/2023, 8:28 AM@Or Weis Thanks 👍
Sumesh Sukumaran
05/18/2023, 2:58 AMHi @Or Weis @Asaf Cohen, Is there a provision to limit the size of the OPA cache? I have seen in one of the threads you mentioned beyond 5 GB it might fail.
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Or Weis
05/18/2023, 5:47 AMHi @Sumesh Sukumaran,no such feature at the moment
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