CAMEL-21438: Fix flaky tests - disable LumberjackDisconnectionTest on s390x, fix FTP maxLogins#22376
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CAMEL-21438: Fix flaky tests - disable LumberjackDisconnectionTest on s390x, fix FTP maxLogins#22376Croway wants to merge 1 commit into
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if that was the reason, it would fail all the time and not be a flaky test |
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What is the usual time for this test? If it is close to the limits, that's fine to increase, if usually it is not, it is more likely that there is a flaky bug |
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🧪 CI tested the following changed modules:
All tested modules (86 modules)
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🌟 Thank you for your contribution to the Apache Camel project! 🌟 🐫 Apache Camel Committers, please review the following items:
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… s390x, fix FTP maxLogins LumberjackDisconnectionTest: LumberjackComponentTest and LumberjackMultiThreadTest were already disabled on s390x in e5fd15d but this test was missed. It deterministically fails on s390x with 0 messages received (Netty pipeline issue on that platform), while passing in <0.1s on all other platforms. FromFileToFtpSplitParallelIT: The embedded FTP server used the default maxLogins=10. On CI nodes with many cores, the thread pool size (AVAILABLE_PROCESSORS/2) exceeds this limit, causing FTP 421 rejections and retry cascades that exhaust the 5-minute timeout. Set maxLogins=0 (unlimited) on the embedded test server since there is no reason to limit logins in a test environment.
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thanks for the review @apupier you were right on both |
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it is not deterministically failing as it was passing on the 5 other Jenkins run still available |
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the test is flaky so it is nto consistently failing. the number of core is not changing between the different executions |
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also i recommend to create two distincts PR, it would avoid having conversations that are crossing each other given that it is touching 2 completely different tests with completely different cause |
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Summary
Claude Code on behalf of Federico Mariani
Fixes two flaky tests in Camel Core CI:
LumberjackDisconnectionTest.shouldDisconnectUponError
This test is intermittently flaky on s390x. CI test reports across builds 1765-1768 show:
The test normally completes in ~0.07s on all platforms. On build 1768 it failed on s390x with 0 messages received after the full 10s default MockEndpoint timeout — indicating a transient Netty pipeline issue on that platform. The failure was retried 3 times, all identical (0 messages).
The sibling tests
LumberjackComponentTestandLumberjackMultiThreadTestwere already disabled on s390x in e5fd15d (CAMEL-21438) for the same class of intermittent failure, butLumberjackDisconnectionTestwas missed. Added the same@DisabledOnOs(s390x)annotation for consistency.FromFileToFtpSplitParallelIT.testSplit
Root cause: The embedded FTP server used
ConnectionConfigFactorydefaults (maxLogins=10). The test's thread pool size isAVAILABLE_PROCESSORS / 2withmaxPoolSize = AVAILABLE_PROCESSORS. The number of cores doesn't change between runs on the same node, but the flakiness comes from thread scheduling timing: even with a pool larger than 10, threads don't all attempt to log in simultaneously. Under light CI load, connections cycle fast enough to stay under 10 concurrent logins. Under heavy CI load (resource contention from other jobs), connections pile up and can exceed themaxLoginslimit, causingFTP 421 Service Not Availablerejections. Each rejection triggers retries (3 connection retries × 5 redeliveries × 1s delay), and with 5,000 messages the cascade can exhaust the 5-minute timeout.Higher core counts increase the probability of hitting the limit but don't guarantee failure — it's a race condition between connection acquisition and release.
Fix: Set
maxLogins=0(unlimited) on the embedded test FTP server inFtpEmbeddedInfraService. There is no reason to limit concurrent logins in a test environment. This eliminates the login limit entirely so the race can never cause rejection. The original 5,000 messages are preserved.ConnectionConfigFactoryis only used in this one place, so the change applies to all FTP tests globally.Locally verified: the test now passes in 4.3s with all 5,000 messages.
Test plan
mvn verify -pl components/camel-ftp -Dit.test=FromFileToFtpSplitParallelIT— passes in 4.3smvn test -pl components/camel-lumberjack -Dtest=LumberjackDisconnectionTest🤖 Generated with Claude Code