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From "Jingsong Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-2140) Fix SplittableDoFn ValidatesRunner tests in FlinkRunner
Date Tue, 09 May 2017 05:08:04 GMT

    [ https://issues.apache.org/jira/browse/BEAM-2140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16002039#comment-16002039
] 

Jingsong Lee commented on BEAM-2140:
------------------------------------

First, {{SplittableParDo}} should not wrap {{StatefulDoFnRunner}}.

Second, {{SplittableParDo}} use {{PROCESSING_TIME}} to continue processing. And it also sets
watermark holds which will affect the sending of the output watermark. (see {{DoFnOperator.processWatermark1()}}).
When {{BoundedSourceWrapper}} is over, it will emit a Long.MAX_VALUE watermark, but the {{SplittableParDo}}
may be not over yet. (depends on system time) So no one can send watermark to the downstream.

Last, {{StreamTask}} will shutdown when there are no inputs and invoke {{timerService.quiesceAndAwaitPending}}.
(see {{StreamTask.invoke()}} in Flink)
It will shutdown TimeService and invoke all task in TimeService and reject the new registration.
So it will break the continue processing of {{SplittableParDo}}.

[~aljoscha] Is that right? Please correct me if I wrong.

> Fix SplittableDoFn ValidatesRunner tests in FlinkRunner
> -------------------------------------------------------
>
>                 Key: BEAM-2140
>                 URL: https://issues.apache.org/jira/browse/BEAM-2140
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> As discovered as part of BEAM-1763, there is a failing SDF test. We disabled the tests
to unblock the open PR for BEAM-1763.



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