Multiple edges between 2 vertices are not supported right now. The only use case that we could think of for that was the self-join case (which you also mention below). That is why we punted on it for the future. TEZ-1190 <https://issues.apache.org/jira/browse/TEZ-1190> tracks the feature.
Bikas *From:* Kostas Tzoumas [mailto:[email protected]] *Sent:* Wednesday, October 01, 2014 11:45 AM *To:* [email protected] *Subject:* Self-join-style DAGs Hi, I am generating a DAG in which a vertex has two input edges that originate on the same vertex (imagine a self-join, or here is an ASCII drawing for you :-). ------------------- | | | V Source ---> Operator As far as I understand, every vertex in Tez needs to have a unique name in the DAG, and logical inputs are offered at runtime as a map of vertex names to inputs. Therefore, my operator above has only one logical input. Is that intentional? If the operator logic is designed with two logical inputs in mind (e.g., a join), what is the best way to model this? Create many readers per input, duplicate the source vertex, ...? Perhaps someone has run into a similar situation. Thanks, Kostas -- 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.
