Build failed in Jenkins: beam_PostCommit_Python_VR_Flink #269

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See <https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink/269/display/redirect?page=changes>

Changes:

[relax] Introduce Group transform.

[relax] Add better type inference for Top output.

[relax] Add tests for FieldTypeDescriptors.

[relax] Fix JavaDoc

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[flink-akka.actor.default-dispatcher-3] INFO org.apache.flink.runtime.jobmaster.JobMaster - Stopping the JobMaster for job test_windowing_1538987069.51(cae3b3f1b7740d1144a11a6f83604c68).
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[flink-akka.actor.default-dispatcher-3] INFO org.apache.flink.runtime.dispatcher.StandaloneDispatcher - Stopping all currently running jobs of dispatcher akka://flink/user/dispatcherf15d5565-84a6-45f1-bacd-82bf62188f46.
[flink-akka.actor.default-dispatcher-2] INFO org.apache.flink.runtime.taskexecutor.TaskExecutor - JobManager for job cae3b3f1b7740d1144a11a6f83604c68 with leader id ac0eb8f119ffc060eeff990d481848f6 lost leadership.
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[flink-akka.actor.default-dispatcher-2] INFO org.apache.flink.runtime.dispatcher.StandaloneDispatcher - Stopped dispatcher akka://flink/user/dispatcherf15d5565-84a6-45f1-bacd-82bf62188f46.
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[flink-runner-job-server] INFO org.apache.beam.runners.flink.FlinkRunner - Execution finished in 1940 msecs
[flink-runner-job-server] INFO org.apache.beam.runners.flink.FlinkRunner - Final accumulator values:
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.
----------------------------------------------------------------------
Ran 25 tests in 76.610s

OK (skipped=7)
Segmentation fault (core dumped)

> Task :beam-sdks-python:flinkCompatibilityMatrixStreaming FAILED
:beam-sdks-python:flinkCompatibilityMatrixStreaming (Thread[Task worker for ':' Thread 11,5,main]) completed. Took 1 mins 18.775 secs.

FAILURE: Build failed with an exception.

* Where:
Build file '<https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink/ws/src/sdks/python/build.gradle'> line: 338

* What went wrong:
Execution failed for task ':beam-sdks-python:flinkCompatibilityMatrixStreaming'.
> Process 'command 'sh'' finished with non-zero exit value 139

* Try:
Run with --stacktrace option to get the stack trace. Run with --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.10.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 10m 46s
59 actionable tasks: 55 executed, 3 from cache, 1 up-to-date

Publishing build scan...
https://gradle.com/s/vj6xleoculmmm

Build step 'Invoke Gradle script' changed build result to FAILURE
Build step 'Invoke Gradle script' marked build as failure

Jenkins build is back to normal : beam_PostCommit_Python_VR_Flink #270

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