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Posted to issues@beam.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2021/03/18 04:28:00 UTC
[jira] [Work logged] (BEAM-12011) WindowFn.getOutputTime break
joins, adds needless complexity
[ https://issues.apache.org/jira/browse/BEAM-12011?focusedWorklogId=568089&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-568089 ]
ASF GitHub Bot logged work on BEAM-12011:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 18/Mar/21 04:27
Start Date: 18/Mar/21 04:27
Worklog Time Spent: 10m
Work Description: kennknowles opened a new pull request #14268:
URL: https://github.com/apache/beam/pull/14268
See [dev@ thread](https://lists.apache.org/thread.html/r99d0efa70f83815e17a1dbfb94effd16b38176046ac8ffbfe371c895%40%3Cdev.beam.apache.org%3E) where consensus is that the existence of this method is a _bug_ and it should be eliminated.
See next [user@ thread](https://lists.apache.org/thread.html/r7220ad2732e3d93e23e1f8af8051c5f6f6d72efdf556a467b9afb9fc%40%3Cuser.beam.apache.org%3E) where no one responded. Perhaps because it is complex and esoteric.
Important points to consider about this change, worth repeating in the PR:
- the method is annotated "experimental" but it has been around since the very early days of Beam so we should ignore that
- it was added as response to a _real user problem_: sliding windows + `EARLIEST` timestamp combiner delays downstream aggregations a lot
- but when that problem occurred, timestamp combiner `EARLIEST` was the default; with the change to how lateness is defined we changed the default to `END_OF_WINDOW`
------------------------
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Issue Time Tracking
-------------------
Worklog Id: (was: 568089)
Remaining Estimate: 0h
Time Spent: 10m
> WindowFn.getOutputTime break joins, adds needless complexity
> ------------------------------------------------------------
>
> Key: BEAM-12011
> URL: https://issues.apache.org/jira/browse/BEAM-12011
> Project: Beam
> Issue Type: Bug
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Priority: P2
> Time Spent: 10m
> Remaining Estimate: 0h
>
> See https://lists.apache.org/thread.html/r99d0efa70f83815e17a1dbfb94effd16b38176046ac8ffbfe371c895%40%3Cdev.beam.apache.org%3E
> The consensus is that we really shouldn't be producing weird output, even if it causes a watermark problem we should solve it another way. It breaks CoGBK joins, and new runner authors have even missed the existence of the need to call into a UDF (hence implementing SlidingWindows the natural way instead of this strange way)
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