I think bellow two articles/talks are good.  Just put them in my blog so that I will read later.

Hadoop Virtual Panel

In this virtual panel, InfoQ talks to several Hadoop vendors and users about their views at current and future state of Hadoop and the things that are the most important for Hadoop’s further adoption and success

Leveraging Your Hadoop Cluster Better - Running Performant Code at Scale

Michael Kopp explains how to run performance code at scale with Hadoop and how to analyze and optimize Hadoop jobs.