rht_size returns the number of key-value pairs contained in a replica.

Use RHT_GET_DELETES to include deleted entries in the size count.

Use of the default RHT_DIRTY_READ flag will cause rht_size to return the size count immediately without waiting for any locally generated updates to be applied. Whereas, specifying the RHT_CLEAN_READ will first apply all locally generated updates, and then return the replica size.

***This size can change in the next instant if the dictionary is not locked. ***