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[Bug] AlignByDeviceOrderByLimitOffsetTest could fail nondeterministically

Open chihyu0917 opened this issue 3 months ago • 2 comments

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  • [x] I searched in the issues and found nothing similar.

Version

OS: Ubuntu 22.04
IoTDB: master @ d719d4651d81e978a74afe6446bee2f5582f4345 Java 17, Apache Maven 3.8.7

Describe the bug and provide the minimal reproduce step

A group of JUnit tests under org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest method methods orderByDeviceTest1, orderByDeviceTest2, orderByDeviceTest3, and orderByDeviceTest4. The tests could fail nondeterministically because they asserted exact child-index positions in the logical-plan tree. Planner variations (region splits, optimisations) sometimes insert a different node type or reorder children, triggering a test bug. I use nondex to reproduce the error. Failed in nondexSeed=933178, 974622.

mvn -pl iotdb-core/datanode edu.illinois:nondex-maven-plugin:2.1.7:nondex -Dtest=org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest#orderByDeviceTest4 -Dnondexruns=10

The bugs under these four methods are alike, so I only provide one of them.

org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest.orderByDeviceTest4 -- Time elapsed: 1.547 s <<< FAILURE!
java.lang.AssertionError

What did you expect to see?

[INFO] Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 1.591 s -- in org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest

What did you see instead?

[INFO] Running org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest
[ERROR] Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 1.654 s <<< FAILURE! -- in org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest
[ERROR] org.apache.iotdb.db.queryengine.plan.planner.distribution.AlignByDeviceOrderByLimitOffsetTest.orderByDeviceTest4 -- Time elapsed: 1.637 s <<< FAILURE!
java.lang.AssertionError

Anything else?

No response

Are you willing to submit a PR?

  • [x] I'm willing to submit a PR!

chihyu0917 avatar Oct 15 '25 22:10 chihyu0917

Hi, this is your first issue in IoTDB project. Thanks for your report. Welcome to join the community!

github-actions[bot] avatar Oct 15 '25 22:10 github-actions[bot]

See https://issues.apache.org/jira/browse/IOTDB-6357

chihyu0917 avatar Oct 17 '25 01:10 chihyu0917