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From "Aljoscha Krettek (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1346) Drop Late Data in ReduceFnRunner
Date Tue, 14 Feb 2017 07:52:42 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1346?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15865303#comment-15865303
] 

Aljoscha Krettek commented on BEAM-1346:
----------------------------------------

Ah dammit, you're right, I forgot about BEAM-696. In fact the Flink Runner also [disables
that optimization|https://github.com/apache/beam/blob/master/runners/flink/runner/src/main/java/org/apache/beam/runners/flink/translation/FlinkStreamingTransformTranslators.java#L850].

> Drop Late Data in ReduceFnRunner
> --------------------------------
>
>                 Key: BEAM-1346
>                 URL: https://issues.apache.org/jira/browse/BEAM-1346
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core
>    Affects Versions: 0.5.0
>            Reporter: Aljoscha Krettek
>
> I think these two commits recently broke late-data dropping for the Flink Runner (and
maybe for other runners as well):
> - https://github.com/apache/beam/commit/2b26ec8
> - https://github.com/apache/beam/commit/8989473
> It boils down to the {{LateDataDroppingDoFnRunner}} not being used anymore  because {{DoFnRunners.lateDataDroppingRunner()}}
is not called anymore when a {{DoFn}} is a {{ReduceFnExecutor}} (because that interface was
removed).
> Maybe we should think about dropping late data in another place, my suggestion is {{ReduceFnRunner}}
but that's open for discussion.



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