Sam Whittle created BEAM-11657:
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Summary: Kafka read performance regression due to added header
support
Key: BEAM-11657
URL: https://issues.apache.org/jira/browse/BEAM-11657
Project: Beam
Issue Type: Bug
Components: io-java-kafka
Reporter: Sam Whittle
Assignee: Sam Whittle
Support for headers in KafkaIO reads was recently added:
https://issues.apache.org/jira/browse/BEAM-10865
This introduced several reflection calls into the path of advancing
KafkaUnboundedReader. While separately running benchmarks, I noticed this
regression.
Calls currently come from:
ConsumerSpEL.hasHeaders -> can be cached similar to other booleans
deserialize key and value methods -> could be avoided in cases where headers
are not being examined (at a minimum can be avoided for known coders like
ByteArrayDeserializer)
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