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https://issues.apache.org/jira/browse/BEAM-11403?focusedWorklogId=527172&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-527172
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ASF GitHub Bot logged work on BEAM-11403:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 22/Dec/20 12:17
Start Date: 22/Dec/20 12:17
Worklog Time Spent: 10m
Work Description: je-ik commented on pull request #13592:
URL: https://github.com/apache/beam/pull/13592#issuecomment-749512239
> because it should be impossible for single DoFn instance to read from
multiple readers.
Sorry, that is not true. Single instance can process multiple sources (after
split). That seems problematic. Maybe we can ignore that, but that will
probably cause issues with DirectRunner, because I think it can clone sources
to simulate recovery from checkpoint.
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Issue Time Tracking
-------------------
Worklog Id: (was: 527172)
Time Spent: 40m (was: 0.5h)
> Unbounded SDF wrapper causes performance regression on DirectRunner
> -------------------------------------------------------------------
>
> Key: BEAM-11403
> URL: https://issues.apache.org/jira/browse/BEAM-11403
> Project: Beam
> Issue Type: Bug
> Components: runner-direct, sdk-java-core
> Reporter: Boyuan Zhang
> Assignee: Boyuan Zhang
> Priority: P2
> Time Spent: 40m
> Remaining Estimate: 0h
>
> There is a significant performance regression when switching from
> UnboundedSource to Unbounded SDF wrapper. So far there are 2 IOs reported:
> * Pubsub Read:
> https://lists.apache.org/thread.html/re6b0941a8b4951293a0327ce9b25e607cafd6e45b69783f65290edee%40%3Cdev.beam.apache.org%3E
> * Kafka Read: https://the-asf.slack.com/archives/C9H0YNP3P/p1606155042346600
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