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https://issues.apache.org/jira/browse/BEAM-115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939334#comment-15939334
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ASF GitHub Bot commented on BEAM-115:
-------------------------------------
GitHub user tgroh opened a pull request:
https://github.com/apache/beam/pull/2309
[BEAM-115] Make Canonical ViewFns Public
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---
Mark all of the ViewFns as both deprecated and experimental. These fns
will all be removed once Runners have multimap support, and are not
suitable for users to use explicitly.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/tgroh/beam public_view_fns
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/beam/pull/2309.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #2309
----
commit b3ea5b22f090958f470fb2a9996ea96d94de2a3c
Author: Thomas Groh <tg...@google.com>
Date: 2017-03-23T22:23:40Z
Make Canonical ViewFns Public
Mark all of the ViewFns as both deprecated and experimental. These fns
will all be removed once Runners have multimap support, and are not
suitable for users to use explicitly.
----
> Beam Runner API
> ---------------
>
> Key: BEAM-115
> URL: https://issues.apache.org/jira/browse/BEAM-115
> Project: Beam
> Issue Type: Improvement
> Components: beam-model-runner-api
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
>
> The PipelineRunner API from the SDK is not ideal for the Beam technical
> vision.
> It has technical limitations:
> - The user's DAG (even including library expansions) is never explicitly
> represented, so it cannot be analyzed except incrementally, and cannot
> necessarily be reconstructed (for example, to display it!).
> - The flattened DAG of just primitive transforms isn't well-suited for
> display or transform override.
> - The TransformHierarchy isn't well-suited for optimizations.
> - The user must realistically pre-commit to a runner, and its configuration
> (batch vs streaming) prior to graph construction, since the runner will be
> modifying the graph as it is built.
> - It is fairly language- and SDK-specific.
> It has usability issues (these are not from intuition, but derived from
> actual cases of failure to use according to the design)
> - The interleaving of apply() methods in PTransform/Pipeline/PipelineRunner
> is confusing.
> - The TransformHierarchy, accessible only via visitor traversals, is
> cumbersome.
> - The staging of construction-time vs run-time is not always obvious.
> These are just examples. This ticket tracks designing, coming to consensus,
> and building an API that more simply and directly supports the technical
> vision.
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