See 
<https://builds.apache.org/job/beam_PostCommit_Python_VR_Flink/374/display/redirect?page=changes>

Changes:

[boyuanz] Make dataset id naming less possible to conflict

[boyuanz] Address Ken's comment

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[assert_that/Group/GroupByKey -> 
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INFO org.apache.flink.runtime.taskmanager.Task - Freeing task resources for 
assert_that/Group/GroupByKey -> 
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[assert_that/Group/GroupByKey -> 
42assert_that/Group/GroupByKey/GroupByWindow.None/beam:env:docker:v1:0 (2/16)] 
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org.apache.flink.runtime.taskexecutor.TaskExecutor - JobManager for job 
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[flink-runner-job-server] INFO org.apache.beam.runners.flink.FlinkRunner - 
Execution finished in 2104 msecs
[flink-runner-job-server] INFO org.apache.beam.runners.flink.FlinkRunner - 
Final accumulator values:
[flink-runner-job-server] INFO org.apache.beam.runners.flink.FlinkRunner - 
__metricscontainers : 
org.apache.beam.runners.core.metrics.MetricsContainerStepMap@14d3fb94
.
----------------------------------------------------------------------
Ran 26 tests in 79.994s

OK (skipped=8)
:beam-sdks-python:flinkCompatibilityMatrixStreaming (Thread[Daemon 
worker,5,main]) completed. Took 1 mins 22.25 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: 351

* What went wrong:
Execution failed for task ':beam-sdks-python:flinkCompatibilityMatrixBatch'.
> Process 'command 'sh'' finished with non-zero exit value 1

* 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 11m 28s
59 actionable tasks: 54 executed, 4 from cache, 1 up-to-date

Publishing build scan...
https://gradle.com/s/2es5mckph4rdq

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

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