tree c0f4f7475a719b828816c2826dc40cfe202c9aa6
parent a8d166c00e6023b478a30092b1b92ded395cfc6e
author Nick Telford <nick.telford@gmail.com> 1716664976 +0100
committer GitHub <noreply@github.com> 1716664976 -0700
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KAFKA-15541: Use LongAdder instead of AtomicInteger (#16076)

`LongAdder` performs better than `AtomicInteger` when under contention
from many threads. Since it's possible that many Interactive Query
threads could create a large number of `KeyValueIterator`s, we don't
want contention on a metric to be a performance bottleneck.

The trade-off is memory, as `LongAdder` uses more memory to space out
independent counters across different cache lines. In practice, I don't
expect this to cause too many problems, as we're only constructing 1
per-store.

Reviewers: Matthias J. Sax <matthias@confluent.io>