[
https://issues.apache.org/jira/browse/BEAM-10676?focusedWorklogId=469281&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-469281
]
ASF GitHub Bot logged work on BEAM-10676:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Aug/20 15:55
Start Date: 11/Aug/20 15:55
Worklog Time Spent: 10m
Work Description: mxm opened a new pull request #12531:
URL: https://github.com/apache/beam/pull/12531
By default, the Python SDK adds a timer output timestamp equal to the current
timestamp of an element. This is problematic because:
1. We hold back the output watermark on the current element's timestamp for
every timer
2. It doesn't match the behavior in the Java SDK which defaults to using the
fire timestamp as the timer output timestamp (and adds a hold on it)
3. There is no way for the user to influence this behavior because there is
no
user-facing API
We should use the fire timestamp as the default output timestamp.
Post-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
Lang | SDK | Dataflow | Flink | Samza | Spark | Twister2
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Go | [](https://ci-beam.apache.org/job/beam_PostCommit_Go/lastCompletedBuild/)
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Java | [](https://ci-beam.apache.org/job/beam_PostCommit_Java/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Dataflow_Java11/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Flink_Java11/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Batch/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Flink_Streaming/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Samza/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Spark/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_PVR_Spark_Batch/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Java_ValidatesRunner_SparkStructuredStreaming/lastCompletedBuild/)
| [](https://builds.apache.org/job/beam_PostCommit_Java_ValidatesRunner_Twister2/lastCompletedBuild/)
Python | [](https://ci-beam.apache.org/job/beam_PostCommit_Python2/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python35/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python36/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python37/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python38/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Py_VR_Dataflow_V2/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Py_ValCont/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PreCommit_Python2_PVR_Flink_Cron/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PostCommit_Python35_VR_Flink/lastCompletedBuild/)
| --- | [](https://ci-beam.apache.org/job/beam_PostCommit_Python_VR_Spark/lastCompletedBuild/)
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XLang | [](https://ci-beam.apache.org/job/beam_PostCommit_XVR_Direct/lastCompletedBuild/)
| --- | [](https://ci-beam.apache.org/job/beam_PostCommit_XVR_Flink/lastCompletedBuild/)
| --- | [](https://ci-beam.apache.org/job/beam_PostCommit_XVR_Spark/lastCompletedBuild/)
| ---
Pre-Commit Tests Status (on master branch)
------------------------------------------------------------------------------------------------
--- |Java | Python | Go | Website
--- | --- | --- | --- | ---
Non-portable | [](https://ci-beam.apache.org/job/beam_PreCommit_Java_Cron/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PreCommit_Python_Cron/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PreCommit_PythonLint_Cron/lastCompletedBuild/)<br>[](https://ci-beam.apache.org/job/beam_PreCommit_PythonDocker_Cron/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PreCommit_Go_Cron/lastCompletedBuild/)
| [](https://ci-beam.apache.org/job/beam_PreCommit_Website_Cron/lastCompletedBuild/)
Portable | --- | [](https://ci-beam.apache.org/job/beam_PreCommit_Portable_Python_Cron/lastCompletedBuild/)
| --- | ---
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Issue Time Tracking
-------------------
Worklog Id: (was: 469281)
Remaining Estimate: 0h
Time Spent: 10m
> Timers use the input timestamp as the timer output timestamp which prevents
> watermark progress
> ----------------------------------------------------------------------------------------------
>
> Key: BEAM-10676
> URL: https://issues.apache.org/jira/browse/BEAM-10676
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core, sdk-py-harness
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> By default, the Python SDK adds a timer output timestamp equal to the current
> timestamp of an element. This is problematic because
> 1. We hold back the output watermark on the current element's timestamp for
> every timer
> 2. It doesn't match the behavior in the Java SDK which defaults to using the
> fire timestamp as the timer output timestamp (and adds a hold on it)
> 3. There is no way for the user to influence this behavior because there is
> no user-facing API
> https://github.com/apache/beam/blob/dfadde2d3ee0a0487362dbcca80388fdc2ef2302/sdks/python/apache_beam/runners/worker/bundle_processor.py#L650
> We should use the fire timestamp as the default output timestamp.
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