aljoscha opened a new pull request #9372: [FLINK-10368] Harden Docker-based Kerberos/YARN e2e test URL: https://github.com/apache/flink/pull/9372 ## What is the purpose of the change * harden the test to fix flakiness ## Brief change log * we now wait for YARN NodeManagers to be up to ensure that Flink has the required resources * we print to YARN logs of the Flink application to aid future debugging efforts * we increase the slot request timeout ## Verifying this change I ran the test on Travis many times to provoke the instability. * This is a Travis run without the fix: https://travis-ci.org/aljoscha/flink/builds/565881922 * This is with the fix: https://travis-ci.org/aljoscha/flink/builds/567768485 With the fix, there are no failures in the tests, only timeouts because Maven dependencies couldn't be fetched
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