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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Created] (TEZ-410) Refactor Edge Connection Pattern to be more clear
Date Wed, 28 Aug 2013 23:03:52 GMT
Bikas Saha created TEZ-410:
------------------------------

             Summary: Refactor Edge Connection Pattern to be more clear
                 Key: TEZ-410
                 URL: https://issues.apache.org/jira/browse/TEZ-410
             Project: Apache Tez
          Issue Type: Improvement
            Reporter: Bikas Saha
            Assignee: Bikas Saha


During discussion with users there was feedback that edge properties need to be named better
to make them more clear. There was a suggestion to look at MPI for inspiration. Based on that
feedback, the proposal is to renamed ConnectionPattern to DataMovement as that is essentially
what the property is defining. A Bipartite connection pattern can be constructed from both
broadcast and scatter-gather data movement types. There will be 3 kinds of data movements
initially. 
Pairwise - Defines an output produced by the ith upstream task is available the the ith downstream
task.
Broadcast - Defines an output produced by any upstream task is available to all downstream
tasks.
Scatter-gather - Defines that the ith output produced by all upstream tasks is available to
the same downstream task. Upstream tasks scatter there outputs and they are gathered by designated
downstream tasks.
To be clear, output being available to the a task does not imply that the entire output is
transferred/read by it. The task can choose to read any amount of the total data.

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