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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/04/08 16:58:00 UTC
[jira] [Work logged] (BEAM-1589) Add OnWindowExpiration method to
Stateful DoFn
[ https://issues.apache.org/jira/browse/BEAM-1589?focusedWorklogId=418713&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-418713 ]
ASF GitHub Bot logged work on BEAM-1589:
----------------------------------------
Author: ASF GitHub Bot
Created on: 08/Apr/20 16:57
Start Date: 08/Apr/20 16:57
Worklog Time Spent: 10m
Work Description: rehmanmuradali commented on pull request #11350: [BEAM-1589] Added @onWindowExpiration annotation.
URL: https://github.com/apache/beam/pull/11350
Added @onWindowExpiration annotation for annotating a user defined method (similar to a method annotated with @ontimer), which allows user to do some work before garbage collection. For example, users can use this annotation to write a method that extracts a value saved in a state before garbage collection.
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 418713)
Time Spent: 1.5h (was: 1h 20m)
> Add OnWindowExpiration method to Stateful DoFn
> ----------------------------------------------
>
> Key: BEAM-1589
> URL: https://issues.apache.org/jira/browse/BEAM-1589
> Project: Beam
> Issue Type: New Feature
> Components: runner-core, sdk-java-core
> Reporter: Jingsong Lee
> Assignee: Shehzaad Nakhoda
> Priority: Major
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> See BEAM-1517
> This allows the user to do some work before the state's garbage collection.
> It seems kind of annoying, but on the other hand forgetting to set a final timer to flush state is probably data loss most of the time.
> FlinkRunner does this work very simply, but other runners, such as DirectRunner, need to traverse all the states to do this, and maybe it's a little hard.
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