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https://issues.apache.org/jira/browse/BEAM-5713?focusedWorklogId=154243&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-154243
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ASF GitHub Bot logged work on BEAM-5713:
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Author: ASF GitHub Bot
Created on: 15/Oct/18 10:30
Start Date: 15/Oct/18 10:30
Worklog Time Spent: 10m
Work Description: mxm commented on issue #6654: [BEAM-5713] Make
ImpulseSourceFunction execute in parallel
URL: https://github.com/apache/beam/pull/6654#issuecomment-429794391
Running `Impulse` in parallel actually doesn't make sense. It should only
emit a single global element. If generated elements ought to be spread across
downstream operators, a non-parallel `DoFn` can generate elements which then go
trough a `Reshuffle` to distribute them onto the following parallel operators.
I will add a new PR with only the tests from this PR.
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Issue Time Tracking
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Worklog Id: (was: 154243)
Time Spent: 50m (was: 40m)
> Flink portable runner schedules all tasks of streaming job on same task
> manager
> -------------------------------------------------------------------------------
>
> Key: BEAM-5713
> URL: https://issues.apache.org/jira/browse/BEAM-5713
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Affects Versions: 2.8.0
> Reporter: Thomas Weise
> Assignee: Maximilian Michels
> Priority: Major
> Labels: portability, portability-flink
> Attachments: Different SlotSharingGroup.png, With
> RichParallelSourceFunction and parallelism 5.png,
> image-2018-10-11-11-43-50-333.png, image-2018-10-11-16-20-45-221.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> The cluster has 9 task managers and 144 task slots total. A simple streaming
> pipeline with parallelism of 8 will get all tasks scheduled on the same task
> manager, causing the host to be fully booked and the remaining cluster idle.
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