not a support questionIt generally depends on your specific application. The maximum thrift message size is 16MB, but you will want to stay *well* within that limit.
The main trade off with batch mutations is that a single row in the mutation failing causes the entire mutation to fail. Since you don't know what part failed you will need to retry the entire mutation. For this reason it's often recommended to use the smallest sizes you need (or no batches) in order to get the performance you need.
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