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*From:* Tim Chou [mailto:[email protected]] *Sent:* Wednesday, July 30, 2014 8:46 AM *To:* [email protected] *Subject:* Some questions about the scheduler. Hi all, 1. I don't understand the difference between NatureOrder-Scheduler and MRR-Scheduler well. It seems that MRR-Scheduler will prevent partitioner and shuffler running until the reducer finishes; NatureOrder-Scheduler do nothing about this and will start partitioner and shuffler at first. *[Bikas] MRR was written for mapreduce compatibility. Its not intended to be used for DAGs. You should only look at NaturalOrder.* 2. If there are three leaf nodes in a dag and there is limited resource in the cluster, no matter which scheduler we use, these three vertices will run together. But the detail number of tasks of each vertex is depend on the practical running situation. Am I right? *[Bikas] That is correct.* 3. Why I cannot find DAGPlan class in our latest version? *[Bikas] DAGPlan is created from the proto definition. So you need to compile the project once for it to be generated during the compilation process.* Thanks, Tim -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
