Hello, I am just getting started with Tez and need some clarification about the logical to physical DAG conversion in Tez. Does Tez convert a Logical DAG to physical DAG at one go or are the number of mappers and reducers for a stage determined only when the stage is ready to run ?
Also, what are some rules of thumb regarding the number of mappers/reducers for a stage ? I would ideally like to fix the #mappers / #reducers in the application itself rather than let Tez determine it. What are the common pitfalls in doing so ? Thanks, Raajay
