aashish-confluent opened a new pull request, #24039:
URL: https://github.com/apache/kafka/pull/24039

   PositionSerde.serialize sized its buffer with Byte.SIZE, Integer.SIZE
   and Long.SIZE, which are sizes in bits, so the buffer was up to 8x
   larger than needed. Callers use array(), so the stored position and the
   changelog position header carried the unused zero bytes. Use the sizes
   in bytes instead. deserialize ignores trailing bytes, so positions
   written before this change can still be read.


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