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From "Bikas Saha (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (TEZ-410) Refactor Edge Connection Pattern to be more clear
Date Thu, 29 Aug 2013 03:02:51 GMT

     [ https://issues.apache.org/jira/browse/TEZ-410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bikas Saha updated TEZ-410:
---------------------------

    Attachment: TEZ-410.3.patch

Renaming the SourceType in EdgeProperty to make it more clear. Added javadoc for all changed
objects. Not adding properties to differentiate concurrent vs sequential scheduling since
support for streaming is not present yet in the AM and can be added as a new enum (with default
of SEQUENTIAL in a backwards compatible manner)
                
> 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
>         Attachments: TEZ-410.1.patch, TEZ-410.2.patch, TEZ-410.3.patch
>
>
> 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. 
> ONE_TO_ONE - 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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