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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/12/11 09:13:00 UTC
[jira] [Work logged] (BEAM-8920) Go SDK: faster
transforms/filter.Distinct with CombinePerKey
[ https://issues.apache.org/jira/browse/BEAM-8920?focusedWorklogId=357721&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-357721 ]
ASF GitHub Bot logged work on BEAM-8920:
----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Dec/19 09:12
Start Date: 11/Dec/19 09:12
Worklog Time Spent: 10m
Work Description: stephydx commented on pull request #10349: [BEAM-8920] Go SDK: faster transforms/filter.Distinct with CombinePerKey
URL: https://github.com/apache/beam/pull/10349
Replace GroupByKey with CombinePerKey in filter.Distinct, taking advantage of the pre-GBK ParDo to reduce shuffle size.
------------------------
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Pre-Commit Tests Status (on master branch)
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Issue Time Tracking
-------------------
Worklog Id: (was: 357721)
Remaining Estimate: 0h
Time Spent: 10m
> 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: 10m
> 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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