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https://issues.apache.org/jira/browse/CASSANDRA-21399?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18085017#comment-18085017
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Dmitry Konstantinov commented on CASSANDRA-21399:
-------------------------------------------------
CI run for trunk: https://pre-ci.cassandra.apache.org/job/cassandra/579
The failures are known and not related to the changes:
Tests / test-latest jdk17 14/20 /
org.apache.cassandra.db.compaction.UnifiedCompactionStrategyTest.testDropExpiredSSTables-latest_jdk17_x86_64
Tests / jvm-dtest jdk17 4/16 /
org.apache.cassandra.distributed.test.accord.AccordMigrationTest.testPaxosToAccordCAS-_jdk17_x86_64
Tests / jvm-dtest jdk17 4/16 /
org.apache.cassandra.distributed.test.accord.AccordMigrationTest.testPaxosToAccordSerialRead-_jdk17_x86_64
Tests / jvm-dtest jdk17 2/16 /
org.apache.cassandra.fuzz.topology.HarryOnAccordTopologyMixupTest.test-_jdk17_x86_64
Tests / dtest-latest jdk17 7/64 /
dtest-latest.bootstrap_test.TestBootstrap.test_consistent_range_movement_false_with_rf1_should_succeed
Tests / dtest-latest jdk17 6/64 /
dtest-latest.bootstrap_test.TestBootstrap.test_consistent_range_movement_true_with_rf1_should_fail
Tests / dtest-latest jdk17 34/64 /
dtest-latest.client_request_metrics_test.TestClientRequestMetrics.test_client_request_metrics
Tests / dtest-latest jdk17 23/64 /
dtest-latest.replace_address_test.TestReplaceAddress.test_replace_with_insufficient_replicas
Tests / dtest-latest jdk17 23/64 /
dtest-latest.replace_address_test.TestReplaceAddress.test_replace_with_insufficient_replicas
Tests / dtest-latest jdk17 23/64 /
dtest-latest.replace_address_test.TestReplaceAddress.test_replace_with_insufficient_replicas
> Megamorphic call overhead at
> org.apache.cassandra.io.util.RandomAccessReader#current
> ------------------------------------------------------------------------------------
>
> Key: CASSANDRA-21399
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21399
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/SSTable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: image-2026-05-23-16-17-07-684.png, isEOF_cpu.png
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> 0.9% of overall CPU in profile is spent in
> org.apache.cassandra.io.util.RandomAccessReader#current
> when we do a polymorphic call of
> org.apache.cassandra.io.util.Rebufferer.BufferHolder#offset
> we can avoid it by caching the offset value for the current block on
> RandomAccessReader level.
> !image-2026-05-23-16-17-07-684.png|width=600!
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