Dear All, Assumed, I've got a list of rowIDs of a HBase table. I want to get each row by its rowID, do some operations with its values, and store the results somewhere subsequently. Is there a good way to do this in a Map-Reduce manner?
As far as I understand, a mapper usually takes a Scan to form inputs. It is quite possible to create such a Scan, which contains a lot of RowFilters to be EQUAL to a particular <rowId>. Such a strategy will work for sure, however is inefficient, since each filter will be tried to match to each found row. So, is there a good Map-Reduce praxis for such kind of situations? (E.g. to make a Get operation inside a map() method.) If yes, could you kindly point to a good code example? Thank you in advance.
