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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (BEAM-22) DirectPipelineRunner: support for unbounded collections
Date Tue, 19 Apr 2016 01:06:25 GMT


ASF GitHub Bot commented on BEAM-22:

GitHub user tgroh opened a pull request:

    [BEAM-22] Track Pending Elements via Exploded WindowedValues

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    This allows the WindowedValues that are completed to be
    removed from the set of pending elements, even if the actual object
    is a different instance, by ensuring that all WindowedValues contain
    only a single (element, window) pair.
    Built on top of #206 

You can merge this pull request into a Git repository by running:

    $ git pull ippr_exploded_wm_tracking

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #207
commit ac0696d8867d7a1706f1ff85c4b299c2b1779d02
Author: Thomas Groh <>
Date:   2016-04-18T23:55:57Z

    Add WindowedValue#explodeWindows
    This takes an existing WindowedValue and returns a Collection of
    WindowedValues, each of which is in exactly one window.
    Use the explode implementation on DoFnRunnerBase

commit 725b2ddea58add3f583ed6f7c74f6ab4343cf292
Author: Thomas Groh <>
Date:   2016-04-19T00:28:47Z

    Track pending elements via exploded WindowedValues
    This allows the WindowedValues to be partially completed while the
    still holding the watermark.


> DirectPipelineRunner: support for unbounded collections
> -------------------------------------------------------
>                 Key: BEAM-22
>                 URL:
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-direct
>            Reporter: Davor Bonaci
>            Assignee: Thomas Groh
> DirectPipelineRunner currently runs over bounded PCollections only, and implements only
a portion of the Beam Model.
> We should improve it to faithfully implement the full Beam Model, such as add ability
to run over unbounded PCollections, and better resemble execution model in a distributed system.
> This further enables features such as a testing source which may simulate late data and
test triggers in the pipeline. Finally, we may want to expose an option to select between
"debug" (single threaded), "chaos monkey" (test as many model requirements as possible), and
"performance" (multi-threaded).
> more testing (chaos monkey) 
> Once this is done, we should update this StackOverflow question:

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