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antirez authored
Certain Redis objects may change upon read only access. This is the case, for instance, of hash tables, that may continue to incrementally rehash after a rehashing operation. A similar problem also happens with the PFCOUNT operation and other operations that may write as a side effect of reading. In the case of PFCOUNT probably the right approach would be to flag the command in a special way in the command table, so that the operation is blocked as it if was a write operation.
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