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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/04/26 21:33:00 UTC
[jira] [Work logged] (BEAM-11644) translations.pack_combiners
optimizer causes breaking change to metrics API
[ https://issues.apache.org/jira/browse/BEAM-11644?focusedWorklogId=589466&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-589466 ]
ASF GitHub Bot logged work on BEAM-11644:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 26/Apr/21 21:32
Start Date: 26/Apr/21 21:32
Worklog Time Spent: 10m
Work Description: yifanmai opened a new pull request #14647:
URL: https://github.com/apache/beam/pull/14647
Runners should not use `pack_all_combiners` because it is not a transparent optimization; it can cause user-visible changes in counters. Runners should use `pack_combiners` instead, which only runs on stages with annotations.
------------------------
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`ValidatesRunner` compliance status (on master branch)
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<th>Flink</th>
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<td>XLang</td>
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Examples testing status on various runners
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<a href="https://ci-beam.apache.org/job/beam_PreCommit_Java_Examples_Dataflow_Cron/lastCompletedBuild/">
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Post-Commit SDK/Transform Integration Tests Status (on master branch)
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Pre-Commit Tests Status (on master branch)
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<th>Go</th>
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<td>Non-portable</td>
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</table>
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Issue Time Tracking
-------------------
Worklog Id: (was: 589466)
Time Spent: 5h 40m (was: 5.5h)
> translations.pack_combiners optimizer causes breaking change to metrics API
> ---------------------------------------------------------------------------
>
> Key: BEAM-11644
> URL: https://issues.apache.org/jira/browse/BEAM-11644
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Affects Versions: 2.27.0
> Reporter: Yifan Mai
> Assignee: Robert Bradshaw
> Priority: P1
> Fix For: 2.28.0
>
> Time Spent: 5h 40m
> Remaining Estimate: 0h
>
> The translations.pack_combiners optimizer causes a breaking change in the public metrics API. The issue arises because metrics are keyed and queryable by step name, and the step name can change after combiner packing. Suppose we have a pipeline that looks like `pipeline | CombinePerKey(combinefn_1); pipeline | CombinePerKey(combinefn_2)` and both combinefn_1 and combinefn_2 increment the same counter per input element. Previously, the result would have two counters, one each for step combinefn_1 and combinefn_2; both will have value num_input_elements. After combiner packing, the result will have one counter for Packed[combinefn_1, combinefn] with value 2 * num_input_elements.
> Unfortunately there is no easy fix for this because the runner has to somehow be aware that a step is a packed step and use the appropriate metrics container for the sub-step.
> The short term workaround is to (1) add a note for 2.27 under known issues and (2) make this phase opt-in in 2.28.
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