Build failed in Jenkins: beam_PostCommit_Py_VR_Dataflow #1402

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See <https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/1402/display/redirect?page=changes>

Changes:

[huangry] Python support for worker jar.

[huangry] Use getattr() instead of hasattr() when checking a field exists or not.

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Started by GitHub push by pabloem
[EnvInject] - Loading node environment variables.
Building remotely on beam15 (beam) in workspace <https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/beam.git # timeout=10
Fetching upstream changes from https://github.com/apache/beam.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/beam.git +refs/heads/*:refs/remotes/origin/* +refs/pull/${ghprbPullId}/*:refs/remotes/origin/pr/${ghprbPullId}/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 287d48d4afe576d7b047a77128ad295cdf868688 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 287d48d4afe576d7b047a77128ad295cdf868688
Commit message: "Merge pull request #6680 from HuangLED/pyJar"
 > git rev-list --no-walk 8e83fb1db3bf1a7596c57d6f09084071750e769f # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
No emails were triggered.
[EnvInject] - Executing scripts and injecting environment variables after the SCM step.
[EnvInject] - Injecting as environment variables the properties content 
SPARK_LOCAL_IP=127.0.0.1

[EnvInject] - Variables injected successfully.
[Gradle] - Launching build.
[src] $ <https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/ws/src/gradlew> --info --continue --max-workers=12 -Dorg.gradle.jvmargs=-Xms2g -Dorg.gradle.jvmargs=-Xmx4g :beam-sdks-python:validatesRunnerBatchTests :beam-sdks-python:validatesRunnerStreamingTests
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Cannot create GC thread. Out of system resources.
# An error report file with more information is saved as:
# <https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/ws/src/hs_err_pid31336.log>
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_Py_VR_Dataflow #1403

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See <https://builds.apache.org/job/beam_PostCommit_Py_VR_Dataflow/1403/display/redirect?page=changes>