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Symptom

The client gets an exception similar to:
ReplyError: ERR max request size exceeded

Diagnosis

Your command exceeds the max request size which is 10MB for “Free” and “Pay as you go” databases.

Solution-1

You can split your data into smaller chunks and send them in separate commands.

Solution-2

You can upgrade your database to a higher plan, or apply a custom quota increase if you are on Pay-as-You-Go plan. Please reach out to support@upstash.com about the options with higher max request size limit.
max-request-size-limit is about the size of a single request. Your data structure (like list, set) can exceed the max request size limit without any problem. If you try to load all elements in the list with a single request then it can throw the max-request-size-limit exception.