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https://issues.apache.org/jira/browse/BEAM-11403?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17298290#comment-17298290
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Boyuan Zhang commented on BEAM-11403:
-------------------------------------

Sorry for the late. 
One last improvement I can come up with is to make checkpoint frequency can be 
configured by pipeline author: 
https://docs.google.com/document/d/18jNLtTyyApx0N2ytp1ytOMmUPLouj2h08N3-4SyWGgQ/edit?usp=sharing.
 

>From what Kaymak reported: 
>https://lists.apache.org/thread.html/r3972e2b6016f59af4bea7b3729f5467d0201007b6f217512914c2fb6%40%3Cuser.beam.apache.org%3E,
> it seems like watermark is still held back with 
>https://github.com/apache/beam/pull/14013.

> 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
>            Priority: P2
>          Time Spent: 4.5h
>  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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