netudima opened a new pull request, #4795:
URL: https://github.com/apache/cassandra/pull/4795
org.apache.cassandra.utils.MergeIterator.Candidate - has Comparator field
which is the same for all Candidates under an MergeIterator instance, we can
move the field to MergeIterator level. Candidate is 4.8% of all allocations and
we can save 20% (~1% of all allocations) of it for JDK 21 with compressed
references on.
switch from ArrayList to array in org.apache.cassandra.db.rows.Row.Merger
The ArrayList iterator costs 0.72% and BulkIterator.Adapter costs 0.35%. So,
in total we can save here ~1% of total allocations.
patch by Dmitry Konstantinov; reviewed by TBD for CASSANDRA-21359
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