Cherry-pick memory estimator changes to 0.17.x branch#1700

Merged

piyushnarang merged 3 commits intotwitter:0.17.xfrom piyushnarang:0.17.x

Jun 26, 2017

+5,066-480

Commits on Jun 22, 2017

Estimator memory of container for mapper/reducer.
Piyush Narang
committed
Refactoring memory and reducer estimator

dieu
authored and
Piyush Narang
committed

Commits on Jun 23, 2017

Break out estimator tests into separate module (twitter#1701 )
Piyush Narang
committed