Gearpump Runner Design Document

[Manu Zhang]

Hi all,

I've drafted a design document
<https://drive.google.com/open?id=1nw64QUWVfT8L7FUprPGLEeNjSBpDMkn1otfLt2rHM5g>for
Gearpump Runner (https://issues.apache.org/jira/browse/BEAM-79). Please
kindly offer your comment.


Thanks,
Manu