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https://issues.apache.org/jira/browse/BEAM-11644?focusedWorklogId=599341&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-599341
]
ASF GitHub Bot logged work on BEAM-11644:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 19/May/21 16:52
Start Date: 19/May/21 16:52
Worklog Time Spent: 10m
Work Description: codecov[bot] edited a comment on pull request #14647:
URL: https://github.com/apache/beam/pull/14647#issuecomment-827175898
#
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Report
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```diff
@@ Coverage Diff @@
## master #14647 +/- ##
==========================================
- Coverage 83.80% 83.79% -0.02%
==========================================
Files 439 878 +439
Lines 59126 118250 +59124
==========================================
+ Hits 49551 99083 +49532
- Misses 9575 19167 +9592
```
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Issue Time Tracking
-------------------
Worklog Id: (was: 599341)
Time Spent: 8h 10m (was: 8h)
> 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: 8h 10m
> 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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