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https://issues.apache.org/jira/browse/BEAM-8920?focusedWorklogId=357876&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-357876
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ASF GitHub Bot logged work on BEAM-8920:
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Author: ASF GitHub Bot
Created on: 11/Dec/19 14:43
Start Date: 11/Dec/19 14:43
Worklog Time Spent: 10m
Work Description: lostluck commented on issue #10349: [BEAM-8920] Go SDK:
faster transforms/filter.Distinct with CombinePerKey
URL: https://github.com/apache/beam/pull/10349#issuecomment-564576278
LGTM
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Issue Time Tracking
-------------------
Worklog Id: (was: 357876)
Time Spent: 0.5h (was: 20m)
> Go SDK: faster transforms/filter.Distinct with CombinePerKey
> ------------------------------------------------------------
>
> Key: BEAM-8920
> URL: https://issues.apache.org/jira/browse/BEAM-8920
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: D. Yang
> Priority: Minor
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> The current implementation:
> 1. add fixed value 1: P<T> --> P<<T, 1>>
> 2. group by key: P<<T, 1>> --> GBK<T, 1>
> 3. drop the value: P<distinct T>
> The new proposed implementation:
> 1. ditto
> 2. combine by key: P<<T, 1>> --> P<<distinct T, 1>>
> 3. ditto
> CombinePerKey performs a pre-GBK ParDo, which is useful to reduce the shuffle
> size.
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