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Posted to commits@cassandra.apache.org by "Bret McGuire (Jira)" <ji...@apache.org> on 2026/09/04 19:42:00 UTC
[jira] [Created] (CASSJAVA-138) Intermittent test failures with ContinuousPagingIT and Java17 (likely flaky test)
Bret McGuire created CASSJAVA-138:
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Summary: Intermittent test failures with ContinuousPagingIT and Java17 (likely flaky test)
Key: CASSJAVA-138
URL: https://issues.apache.org/jira/browse/CASSJAVA-138
Project: Apache Cassandra Java driver
Issue Type: Improvement
Reporter: Bret McGuire
While working on CASSJAVA-136 I started seeing random test failures on Jenkins builds of my pull request. The change implemented on the pull request (a modification of equality for DSE geometric types) has absolutely no relation to continuous paging or anything in the test. Yet after my modification I saw the following:
First run:
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Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=1, sizeInBytes=false, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=100]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=10, maxPagesPerSecond=0, expectedRows=100, expectedPages=10]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=9, maxPagesPerSecond=0, expectedRows=90, expectedPages=9]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=0, maxPagesPerSecond=2, expectedRows=100, expectedPages=10]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=8, sizeInBytes=true, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=100]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=16, sizeInBytes=true, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=50]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=32, sizeInBytes=true, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=25]
{noformat}
Second run (with identical code):
{noformat}
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=99, sizeInBytes=false, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=2]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=50, sizeInBytes=false, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=2]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=1, sizeInBytes=false, maxPages=0, maxPagesPerSecond=0, expectedRows=100, expectedPages=100]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=10, maxPagesPerSecond=0, expectedRows=100, expectedPages=10]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=9, maxPagesPerSecond=0, expectedRows=90, expectedPages=9]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.9.0', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=0, maxPagesPerSecond=2, expectedRows=100, expectedPages=10]
Per-Commit / Matrix - SERVER_VERSION = 'dse-6.8.30', JABBA_VERSION = 'openjdk@1.17' / Execute-Tests / com.datastax.dse.driver.api.core.cql.continuous.ContinuousPagingIT.should_execute_prepared_statement_synchronously[pageSize=10, sizeInBytes=false, maxPages=9, maxPagesPerSecond=0, expectedRows=90, expectedPages=9]
{noformat}
A couple things are of interest here:
* The tests only fail on Java17. The Jenkins build runs tests for Java8, Java11, Java17 and Java21 but only Java17 seems to fail
* I do not see any equivalent failure on test runs of the 4.x branch
** In fairness the 4.x branch would still have the geometry issue referenced in CASSJAVA-136 but as mentioned above there's no correlation between that issue and this test
* The [test provider in question|https://github.com/apache/cassandra-java-driver/blob/e15da70e9fe2856bbcb27ab141b755440ca39ca9/integration-tests/src/test/java/com/datastax/dse/driver/api/core/cql/continuous/ContinuousPagingITBase.java#L84-L108] has 10 distinct options and no test is failing for all 10 options
* Tests for a given version of DSE are not consistent between runs
All this evidence together seems to argue for a flaky integration test... but I don't see anything obviously wrong with it
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