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https://issues.apache.org/jira/browse/BEAM-8292?focusedWorklogId=408091&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-408091
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ASF GitHub Bot logged work on BEAM-8292:
----------------------------------------
Author: ASF GitHub Bot
Created on: 23/Mar/20 17:37
Start Date: 23/Mar/20 17:37
Worklog Time Spent: 10m
Work Description: lostluck commented on pull request #11197: [BEAM-8292]
Portable Reshuffle for Go SDK
URL: https://github.com/apache/beam/pull/11197
This adds a Reshuffle transform to the Go SDK.
* In particular, it configures windowing & trigggers for a GBK to allow for
fusion breaks, where parallelism needs to increase, or decrease due to data
bundling properties.
* Previous element window and timestamps are preserved.
* The SDK operations are wrapped with a higher level reshuffle URN so
runners can optimize this step better.
Note: While this should work for streaming cases, it hasn't been tested with
them yet, due to the current state of streaming the Go SDK.
It further adds one small optimization for the internal Decoding interface,
called the DecodeTo method to avoid extra allocations to the heap incurred by
returning a *FullValue. Can't avoid extra allocations for KV types at present,
but value PCollections should have lower overhead. A subsequent PR will use the
DecodeTo method at a other applicable places in the decode stack.
------------------------
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Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
Lang | SDK | Apex | Dataflow | Flink | Gearpump | Samza | Spark
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Go | [](https://builds.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/)
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Java | [](https://builds.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Apex/lastCompletedBuild/)
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| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/)
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| --- | [](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
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| --- | --- | [](https://builds.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/)
Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
--- |Java | Python | Go | Website
--- | --- | --- | --- | ---
Non-portable | [](https://builds.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/)<br>[](https://builds.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/)
Portable | --- | [](https://builds.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/)
| --- | ---
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Issue Time Tracking
-------------------
Worklog Id: (was: 408091)
Time Spent: 0.5h (was: 20m)
> Add a Reshuffle PTransform preventing fusion of the surrounding transforms
> --------------------------------------------------------------------------
>
> Key: BEAM-8292
> URL: https://issues.apache.org/jira/browse/BEAM-8292
> Project: Beam
> Issue Type: New Feature
> Components: sdk-go
> Reporter: John Patoch
> Assignee: Robert Burke
> Priority: Minor
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> Reshuffle is a PTransform that takes a PCollection<A> and shuffles the data
> to help increase parallelism.
> Reshuffle adds a temporary random key to each element, performs a
> GroupByKey, and finally removes the temporary key.
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