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https://issues.apache.org/jira/browse/BEAM-13930?focusedWorklogId=726730&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-726730
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ASF GitHub Bot logged work on BEAM-13930:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 15/Feb/22 00:05
Start Date: 15/Feb/22 00:05
Worklog Time Spent: 10m
Work Description: codecov[bot] edited a comment on pull request #16852:
URL: https://github.com/apache/beam/pull/16852#issuecomment-1039699070
#
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@@ Coverage Diff @@
## release-2.37.0 #16852 +/- ##
===================================================
+ Coverage 46.79% 83.60% +36.81%
===================================================
Files 203 452 +249
Lines 20044 62269 +42225
===================================================
+ Hits 9379 52063 +42684
- Misses 9665 10206 +541
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Issue Time Tracking
-------------------
Worklog Id: (was: 726730)
Time Spent: 1h 10m (was: 1h)
> Address StateSpec inconsistency between Runner and Fn API
> ---------------------------------------------------------
>
> Key: BEAM-13930
> URL: https://issues.apache.org/jira/browse/BEAM-13930
> Project: Beam
> Issue Type: Improvement
> Components: beam-model, sdk-java-core, sdk-py-core
> Reporter: Luke Cwik
> Assignee: Luke Cwik
> Priority: P2
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> The ability to mix and match runners and SDKs is accomplished through two
> portability layers:
> 1. The Runner API provides an SDK-and-runner-independent definition of a Beam
> pipeline
> 2. The Fn API allows a runner to invoke SDK-specific user-defined functions
> Apache Beam pipelines support executing stateful DoFns[1]. To support this
> execution the Runner API defines multiple user state specifications:
> * ReadModifyWriteStateSpec
> * BagStateSpec
> * OrderedListStateSpec
> * CombiningStateSpec
> * MapStateSpec
> * SetStateSpec
> The Fn API[2] defines APIs[3] to get, append and clear user state currently
> supporting a BagUserState and MultimapUserState protocol.
> Since there is no clear mapping between the Runner API and Fn API state
> specifications, there is no way for a runner to know that it supports a given
> API necessary to support the execution of the pipeline. The Runner will also
> have to manage additional runtime metadata associated with which protocol was
> used for a type of state so that it can successfully manage the state’s
> lifetime once it can be garbage collected.
> Please see the doc[4] for further details and a proposal on how to address
> this shortcoming.
> 1: https://beam.apache.org/blog/stateful-processing/
> 2:
> https://github.com/apache/beam/blob/3ad05523f4cdf5122fc319276fcb461f768af39d/model/fn-execution/src/main/proto/beam_fn_api.proto#L742
> 3: https://s.apache.org/beam-fn-state-api-and-bundle-processing
> 4: http://doc/1ELKTuRTV3C5jt_YoBBwPdsPa5eoXCCOSKQ3GPzZrK7Q
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