This document discusses tuning a pipeline with Apache Tez. It provides an overview of Tez, including that it aims to enhance scenarios not well served by MapReduce by supporting Hive and Pig. It details lessons learned from using Tez, such as some Pig tasks not compiling and occasional freezing, lack of DistributedCache support for S3, and poor Amazon support. The document concludes by stating that Tez is good for early adopters of Pig and Hive and those with bounded workloads.