Issues

• [39.0.0] fix!: fix CI and JDK HttpClient failures on JDK 25.0.5 caused by query response trailers

  Backport
  apache/druid#20721 · Filter by author github-actions opened on Oct 24, 2026 · 39.0.0

• Flaky test: EmbeddedDartQueryCancellationTest.test_cancelDartQuery_cancelsWorkOrderRetries

  Contributions WelcomeFlaky test
  apache/druid#20683 · Filter by author FrankChen021 opened on Oct 22, 2026

• [39.0.0] perf: optimize some multi-value string operators to allow planning to specialized ListFilteredVirtualColumn without extractionFn

  Backport
  apache/druid#20670 · Filter by author github-actions opened on Oct 21, 2026 · 39.0.0

• [39.0.0] feat: catalog compaction support for msq and base table spec

  approvedBackport
  apache/druid#20669 · Filter by author github-actions opened on Oct 21, 2026 · 39.0.0
  1

• Apache Druid Router SQL request body can exhaust JVM heap

  Uncategorized problem report
  apache/druid#20665 · Filter by author skadiscarlet opened on Oct 21, 2026
  1

• Flaky test: BatchAppenderatorTest.testSimpleIngestion

  Contributions WelcomeFlaky test
  apache/druid#20662 · Filter by author FrankChen021 opened on Oct 21, 2026
  1

• [39.0.0] minor: MSQ tasks dont need the entire worker context passed through to the task context. pass only what is needed

  Backport
  apache/druid#20659 · Filter by author github-actions opened on Oct 21, 2026 · 39.0.0

• Flaky test: HistoricalCloningTest.test_cloneHistoricals_inTurboMode_duringCoordinatorLeaderSwitch

  Contributions WelcomeFlaky test
  apache/druid#20644 · Filter by author FrankChen021 opened on Oct 20, 2026

• [39.0.0] feat: add experimental sys.query_context_parameters system table

  Backport
  apache/druid#20643 · Filter by author github-actions opened on Oct 20, 2026 · 39.0.0

• SQL planning fails with StackOverflowError when JSON_QUERY_ARRAY is applied to a constant JSON value (DruidRexExecutor reduces ARRAY<COMPLEX<json>> constants)

  Uncategorized problem report
  apache/druid#20631 · Filter by author fbaranski opened on Oct 19, 2026

• Flaky test: ReservoirSegmentSamplerTest.testSegmentsFromMorePopulousServerAreMoreLikelyToBePicked

  Contributions WelcomeFlaky test
  apache/druid#20627 · Filter by author FrankChen021 opened on Oct 18, 2026

• Web console: line numbers on sub-query run markers repeat after each edit

  Area - Web ConsoleBug
  apache/druid#20605 · Filter by author FrankChen021 opened on Oct 15, 2026 · 39.0.0
  1

• Flaky test: KafkaClusterMetricsTest (test_ingest10kRows_ofSelfClusterMetrics_andVerifyValues, test_ingestClusterMetrics_withConcurrentCompactionSupervisor_andKillUnusedSegments)

  Contributions WelcomeFlaky test
  apache/druid#20603 · Filter by author FrankChen021 opened on Oct 15, 2026
  1

• Flaky test: StreamAppenderatorTest.testSimpleIngestion

  Contributions WelcomeFlaky test
  apache/druid#20602 · Filter by author FrankChen021 opened on Oct 15, 2026
  2

  

• Flaky test: MSQWorkerFaultToleranceTest.test_cancelledWorker_isRetried_ifFaultToleranceIsEnabled

  Contributions WelcomeFlaky test
  apache/druid#20554 · Filter by author FrankChen021 opened on Oct 11, 2026
  1

  

• Flaky test: EmbeddedSecureJdbcDriverTest (surefire fork exits with code 1)

  Contributions WelcomeFlaky test
  apache/druid#20551 · Filter by author FrankChen021 opened on Oct 10, 2026

• Remove deprecated API usage and prevent regressions

  Contributions Welcome
  apache/druid#20525 · Filter by author FrankChen021 opened on Oct 8, 2026
  6

  

• Broker can allocate excessive processing buffers

  apache/druid#20494 · Filter by author gianm opened on Oct 6, 2026
  3

• CI infra: packaging-check apt-get update hangs until 60-minute step timeout

  Contributions WelcomeFlaky test
  apache/druid#20473 · Filter by author FrankChen021 opened on Oct 2, 2026

• Flaky test dashboard

  Flaky test
  apache/druid#20437 · Filter by author FrankChen021 opened on Sep 26, 2026

• CI infra: Maven cannot resolve parent POM org.apache:apache (${repoOrgUrl})

  Contributions WelcomeFlaky test
  apache/druid#20436 · Filter by author FrankChen021 opened on Sep 26, 2026
  5

• Flaky test: KinesisFaultToleranceTest.test_supervisorRecovers_afterChangeInTopicPartitions_withEmptyShards

  Contributions WelcomeFlaky test
  apache/druid#20434 · Filter by author FrankChen021 opened on Sep 26, 2026
  1

• Flaky test: KinesisFaultToleranceTest.test_supervisorRecovers_afterSuspendResume_withEmptyShards

  Contributions WelcomeFlaky test
  apache/druid#20433 · Filter by author FrankChen021 opened on Sep 26, 2026
  2

• Flaky test: KubernetesClusterDockerTest (k3s pod never becomes Ready)

  Contributions WelcomeFlaky test
  apache/druid#20432 · Filter by author FrankChen021 opened on Sep 26, 2026
  1

• Batch ingestion: preserve Arrow columnar batches beyond the Iceberg reader

  apache/druid#20401 · Filter by author Shekharrajak opened on Sep 22, 2026
  2