RF invocations are batched in a single HTTP request, but there's no implied transaction. You're free to use a transaction-per-HTTP-request scheme, or a transaction-per-invocation one (or no transaction at all). So when an invocation fail, RF doesn't assume the whole batch can be sent again. BTW, batching things in a single HTTP request is a network optimization (less HTTP requests => better overall performance). You'd want to batch an important data update with an "unimportant" retrieval; and you wouldn't want a failing unimportant retrieval to make the important update fail as well.
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