Vicky Papavasileiou created KAFKA-14251:
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Summary: Improve CPU usage of self-joins by sacrificing order
Key: KAFKA-14251
URL: https://issues.apache.org/jira/browse/KAFKA-14251
Project: Kafka
Issue Type: Improvement
Reporter: Vicky Papavasileiou
The current self-join operator implementation ensures that records in the
output follow the same order as if the join was implemented using an
inner-join. To achieve this, the self-join operator needs to use two loops,
each doing a window store fetch, to simulate the left-hand side of the join
probing the join and the right-hand side probing the join.
As an optimization, if we don't care about the ordering of the join results, we
can avoid doing two loops and instead do one where the window store fetch will
use the union of the left and righ-side windows.
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