youtube/vitess — pull request #209 by enisoc (2014-12-05 00:39:46+00:00)
Title: Add tracing for refreshTablet and action unlock.

@alainjobart

After this, we should be fully accounting for all the time in TabletExternallyReparented. I'll go ahead and start working on the proposal though since these changes only fill in the last 4% of time.