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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/05/29 03:22:00 UTC
[jira] [Work logged] (BEAM-10005) Unable to use
ApproximateQuantiles.globally/ApproximateUnique.globally when inputs not
windowed by GlobalWindows
[ https://issues.apache.org/jira/browse/BEAM-10005?focusedWorklogId=438553&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-438553 ]
ASF GitHub Bot logged work on BEAM-10005:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 29/May/20 03:21
Start Date: 29/May/20 03:21
Worklog Time Spent: 10m
Work Description: darshanj opened a new pull request #11855:
URL: https://github.com/apache/beam/pull/11855
Added api combineFn that can be used for inputs windowed with non global windows
**Please** add a meaningful description for your change here
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Issue Time Tracking
-------------------
Worklog Id: (was: 438553)
Remaining Estimate: 0h
Time Spent: 10m
> Unable to use ApproximateQuantiles.globally/ApproximateUnique.globally when inputs not windowed by GlobalWindows
> ----------------------------------------------------------------------------------------------------------------
>
> Key: BEAM-10005
> URL: https://issues.apache.org/jira/browse/BEAM-10005
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Affects Versions: 2.20.0
> Reporter: Darshan Jani
> Assignee: Darshan Jani
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Unable to use ApproximateQuantiles.globally or ApproximateUnique.globally with input windowed not using GlobalWindows.
> To make it run we need to set either
> {code:java}
> .withoutDefaults()
> {code}
> or
> {code:java}
> .asSingletonView()
> {code}
> Currently we can't call any of the above on ApproximateQuantiles.globally()/ApproximateUnique.globally as it does not return underlying Combine.globally, but PTransform or Globally<T> in case of ApproximateUnique.
> Example failing case:
> {code:java}
> PCollection<Long> elements = p.apply(GenerateSequence.from(0).to(100)
> .withRate(1,Duration.millis(1)).withTimestampFn(Instant::new));
> PCollection<List<Long>> input = elements
> .apply(Window.into(SlidingWindows.of(Duration.millis(3)).every(Duration.millis(1))))
> .apply(ApproximateQuantiles.globally(17));
> {code}
> It throws expected error from internal Combine.globally() transform:
> {code:java}
> Default values are not supported in Combine.globally() if the input PCollection is not windowed by GlobalWindows. Instead, use Combine.globally().withoutDefaults() to output an empty PCollection if the input PCollection is empty, or Combine.globally().asSingletonView() to get the default output of the CombineFn if the input PCollection is empty.
> {code}
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