Unbounded SDF wrapper causes performance regression on DirectRunner
Open
bug
core
direct
java
P3
runners
- Dominant language
- Java
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Description
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
Imported from Jira [BEAM-11403](https://issues.apache.org/jira/browse/BEAM-11403). Original Jira may contain additional context.
Reported by: boyuanz.
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