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https://issues.apache.org/jira/browse/CASSANDRA-21402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18084118#comment-18084118
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Dmitry Konstantinov commented on CASSANDRA-21402:
-------------------------------------------------
6.0 CI run: https://pre-ci.cassandra.apache.org/job/cassandra-6.0/28/
It has only known test failures, not related to the changes.
Tests / dtest-latest jdk17 17/64 /
dtest-latest.materialized_views_test.TestMaterializedViews.test_complex_mv_select_statements
Tests / test-latest jdk17 10/20 /
org.apache.cassandra.db.compaction.CompactionStrategyManagerTest.testAutomaticUpgradeConcurrency-latest_jdk17_x86_64
(CASSANDRA-19376)
Tests / jvm-dtest jdk17 14/16 /
org.apache.cassandra.distributed.test.accord.FullAccordCQLTest.testCASAndSerialRead-_jdk17_x86_64
Tests / jvm-dtest jdk17 8/16 /
org.apache.cassandra.distributed.test.accord.MixedReadAccordCQLTest.testCASAndSerialRead-_jdk17_x86_64
Tests / jvm-dtest jdk17 15/16 /
org.apache.cassandra.distributed.test.accord.InteropAccordCQLTest.testCASSimulatorLite-_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 / 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
> Avoid type lookup in SerializationHeader#getType if schema and SSTable are
> aligned
> ----------------------------------------------------------------------------------
>
> Key: CASSANDRA-21402
> URL: https://issues.apache.org/jira/browse/CASSANDRA-21402
> Project: Apache Cassandra
> Issue Type: Improvement
> Components: Local/SSTable
> Reporter: Dmitry Konstantinov
> Assignee: Dmitry Konstantinov
> Priority: Normal
> Fix For: 6.x, 7.x
>
> Attachments: CASSANDRA-21402-trunk_ci_summary.htm.zip,
> CASSANDRA-21402_after_cpu.html, CASSANDRA-21402_before_cpu.html, after.png,
> before.png, image-2026-05-24-16-36-12-733.png
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Cell.Serializer#deserialize lookup an actual type for every cell using
> SerializationHeader#getType, it is ~27% of a cell deserialization CPU cost
> and ~5% of total CPU cost for a read scenario (10 row partition select, CPU
> bound)
> if schema and SSTable are aligned we can avoid this lookup (we can go further
> and avoid it even if they are not aligned but it looks more complicated from
> analysis or/and implementation point of view)
> !image-2026-05-24-16-36-12-733.png|width=800!
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