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https://issues.apache.org/jira/browse/BEAM-12276?focusedWorklogId=601304&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-601304
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ASF GitHub Bot logged work on BEAM-12276:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 24/May/21 17:36
            Start Date: 24/May/21 17:36
    Worklog Time Spent: 10m 
      Work Description: je-ik commented on pull request #14718:
URL: https://github.com/apache/beam/pull/14718#issuecomment-847215896


   If we enforce the use of explicit output timestamp I think that from the 
correctness perspective, it really looks like c) is the way to go. I'm still 
not convinced we can simply ignore the fact that it is breaking change, though. 
Mostly because it is a *runtime* breaking change, that can result in production 
downtimes (if a buggy code is not revealed during testing of a pipeline, which 
might happen).


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 601304)
    Time Spent: 5h 10m  (was: 5h)

> Timer.withOutputTimestamp(Instant).offset(Duration).setRelative() might fail 
> unexpectedly
> -----------------------------------------------------------------------------------------
>
>                 Key: BEAM-12276
>                 URL: https://issues.apache.org/jira/browse/BEAM-12276
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>    Affects Versions: 2.30.0
>            Reporter: Jan Lukavský
>            Assignee: Jan Lukavský
>            Priority: P2
>             Fix For: 2.31.0
>
>          Time Spent: 5h 10m
>  Remaining Estimate: 0h
>
> We check that timer's output timestamp is not before timer fire timestamp. 
> The fire timestamp is unknown to user when setting a relative timer and 
> therefore cannot be checked in user code.



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