Build failed in Jenkins: beam_PerformanceTests_JDBC #328

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See <https://builds.apache.org/job/beam_PerformanceTests_JDBC/328/display/redirect>

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Started by timer
[EnvInject] - Loading node environment variables.
Building remotely on beam1 (beam) in workspace <https://builds.apache.org/job/beam_PerformanceTests_JDBC/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 c41521ab68ebfa6457ce5a4fbe89383e888e4e59 (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f c41521ab68ebfa6457ce5a4fbe89383e888e4e59
Commit message: "Merge pull request #4834 from cclauss/basestring-to-six.string_types-again"
 > git rev-list --no-walk c41521ab68ebfa6457ce5a4fbe89383e888e4e59 # timeout=10
Cleaning workspace
 > git rev-parse --verify HEAD # timeout=10
Resetting working tree
 > git reset --hard # timeout=10
 > git clean -fdx # timeout=10
[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.
[beam_PerformanceTests_JDBC] $ /bin/bash -xe /tmp/jenkins3232178063081066886.sh
+ gcloud container clusters get-credentials io-datastores --zone=us-central1-a --verbosity=debug
DEBUG: Running gcloud.container.clusters.get-credentials with Namespace(__calliope_internal_deepest_parser=ArgumentParser(prog='gcloud.container.clusters.get-credentials', usage=None, description='See https://cloud.google.com/container-engine/docs/kubectl for\nkubectl documentation.', version=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=False), account=None, api_version=None, authority_selector=None, authorization_token_file=None, cmd_func=<bound method Command.Run of <googlecloudsdk.calliope.backend.Command object at 0x7fabe46e5590>>, command_path=['gcloud', 'container', 'clusters', 'get-credentials'], configuration=None, credential_file_override=None, document=None, format=None, h=None, help=None, http_timeout=None, log_http=None, name='io-datastores', project=None, quiet=None, trace_email=None, trace_log=None, trace_token=None, user_output_enabled=None, verbosity='debug', version=None, zone='us-central1-a').
Fetching cluster endpoint and auth data.
DEBUG: Saved kubeconfig to /home/jenkins/.kube/config
kubeconfig entry generated for io-datastores.
INFO: Display format "default".
[beam_PerformanceTests_JDBC] $ /bin/bash -xe /tmp/jenkins8018073380656377788.sh
+ cp /home/jenkins/.kube/config <https://builds.apache.org/job/beam_PerformanceTests_JDBC/ws/config-jdbcioit-1521019068242>
[beam_PerformanceTests_JDBC] $ /bin/bash -xe /tmp/jenkins7631797884233040991.sh
+ kubectl --kubeconfig=<https://builds.apache.org/job/beam_PerformanceTests_JDBC/ws/config-jdbcioit-1521019068242> create namespace jdbcioit-1521019068242
Error from server (AlreadyExists): namespaces "jdbcioit-1521019068242" already exists
Build step 'Execute shell' marked build as failure

Jenkins build is back to normal : beam_PerformanceTests_JDBC #329

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See <https://builds.apache.org/job/beam_PerformanceTests_JDBC/329/display/redirect>