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https://issues.apache.org/jira/browse/SPARK-21573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16107713#comment-16107713
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Sean Owen commented on SPARK-21573:
-----------------------------------

[~shaneknapp] does it matter that this and one other script are the only ones 
referring to python2? I wonder if that's picking up something besides the 
Python3 that I assume 'py3k' is providing.

I am pretty sure it's specific to a machine or machines, maybe? For example 
this failed 3 times in a row on  amp-jenkins-worker-04

https://amplab.cs.berkeley.edu/jenkins/view/Spark%20QA%20Test%20(Dashboard)/job/spark-branch-2.1-test-sbt-hadoop-2.6/

> Tests failing with run-tests.py SyntaxError occasionally in Jenkins
> -------------------------------------------------------------------
>
>                 Key: SPARK-21573
>                 URL: https://issues.apache.org/jira/browse/SPARK-21573
>             Project: Spark
>          Issue Type: Test
>          Components: Tests
>    Affects Versions: 2.3.0
>            Reporter: Hyukjin Kwon
>            Priority: Minor
>
> It looks default {{python}} in the path at few places such as 
> {{./dev/run-tests}} use Python 2.6 in Jenkins and it fails to execute 
> {{run-tests.py}}:
> {code}
> python2.6 run-tests.py
>   File "run-tests.py", line 124
>     {m: set(m.dependencies).intersection(modules_to_test) for m in 
> modules_to_test}, sort=True)
>                                                             ^
> SyntaxError: invalid syntax
> {code}
> It looks there are quite some places to fix to support Python 2.6 in 
> {{run-tests.py}} and related Python scripts.
> We might just try to set Python 2.7 in few other scripts running this if 
> available.
> Please also see 
> http://apache-spark-developers-list.1001551.n3.nabble.com/Tests-failing-with-run-tests-py-SyntaxError-td22030.html



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