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# ask-questionsw
worried-planet-2191
05/04/2022, 8:22 AMThis message was deleted.
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fresh-football-47124
05/04/2022, 8:39 AM
Hi Bardur, thanks
fresh-football-47124
05/04/2022, 8:40 AM
well, it will start to throw errors with the API connections
fresh-football-47124
05/04/2022, 8:40 AM
but we encourage caching of the features json so there are no hard dependancies
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creamy-doctor-6871
05/04/2022, 9:19 AMthank you for the quick answer š I have a follow-up question: What will the SDK deliver in case the MongoDB crashes? Will it throw errors as well?
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future-teacher-7046
05/04/2022, 11:56 AM
For Mongo, it's recommended to run a 3-member replica set in production and use persistent volumes for storage.
future-teacher-7046
05/04/2022, 11:58 AM
As for the SDKs, with the exception of Kotlin, none of the SDKs make any network requests. You pass in a JSON object with feature definitions. If you fetch that JSON directly from the GrowthBook API endpoint, then it will fail if mongo or the API is down. We recommend adding a caching layer so that even with GrowthBook down, you can still fetch the latest features JSON from the cache
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prehistoric-waitress-6977
05/09/2022, 4:06 PMIām curious, why does Kotlin SDK need network access?
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future-teacher-7046
05/09/2022, 4:07 PM
It handles fetching and caching feature configs. The swift SDK also does this, but it's not required. You can just pass in JSON directly.
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