scwhittle opened a new pull request #13782:
URL: https://github.com/apache/beam/pull/13782
When headers are not supported, there are no reflection calls remaining as
this knowledge is computed once in the ConsumerSpEL singleton.
When headers are supported but the decoder does not implement the method to
examine headers, there are no reflection calls based upon a cache keyed by
decoder in the ConsumerSpeEL singleton.
When headers are supported and possibly used by the coder, a
reflection-based expression is still evaluated for each deserialization. I
tried to enable expression compilation but was unable to get it working, I
believe due to the generics as part of the Deserializer<T> object but I am not
sure. That is a possible performance improvement for the future for uses that
require headers.
------------------------
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