+1 to what Dylan said.
The naive approach would be to run a scan from [rowID:,rowID;), parse
out the otherID and count them. The iterator approach Dylan suggested
would push this work to the TabletServer which would likely result in a
much more efficient computation.
Dylan Hutchison wrote:
Write an iterator to compute partial sums. Make sure the iterator does not
return a key outside if the range to which it was seeked. (You don't have
to modify the keys you return; just sum the keys below the first one for
each key prefix into the first one.)
Collect the partial sums at the client
Hello all
My keys are of the form rowID:otherID where there are multiple otherIDs for
a RowID. I want to know the count of all the otherIDs within a rowID. What
would be the most optimal way to implement this?
Best regards,
Yamini Joshi
