John Roesler created KAFKA-8452:
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Summary: Possible Suppress buffer optimization: de-duplicate prior
value
Key: KAFKA-8452
URL: https://issues.apache.org/jira/browse/KAFKA-8452
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: John Roesler
As of KAFKA-8199, the suppression buffers have to track the "prior value" in
addition to the "old" and "new" values for each record, to support transparent
downstream views.
In many cases, the prior value is actually the same as the old value, and we
could avoid storing it separately. The challenge is that the old and new values
are already serialized into a common array (as a Change via the
FullChangeSerde), so the "prior" value would actually be a slice on the
underlying array. But, of course, Java does not have array slices.
To get around this, we either need to switch to ByteBuffers (which support
slices) or break apart the serialized Change into just serialized old and new
values.
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