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https://issues.apache.org/jira/browse/SPARK-799?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14386571#comment-14386571
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Steve Loughran commented on SPARK-799:
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Proving python versions of the launcher scripts is probably a better approach 
to supporting windows than .cmd or .ps1 files

# {{cmd}} is a painfully dated shell language, as you note.
# Powershell is better, but not widely known in the java/scala dev space.
# Neither ps1 nor cmd files can be tested except in Windows

Python is cross-platform-ish enough that it can be tested on Unix systems too, 
and more likely to be maintained. It's not seamlessly cross-platform; 
propagating stdout/stderr from spawned java processes. It also provides the 
option of becoming the Unix entry point (the bash script simply invoking it), 
so that maintenance effort is shared, and testing becomes even more implicit.

> Windows versions of the deploy scripts
> --------------------------------------
>
>                 Key: SPARK-799
>                 URL: https://issues.apache.org/jira/browse/SPARK-799
>             Project: Spark
>          Issue Type: Bug
>          Components: Deploy, Windows
>            Reporter: Matei Zaharia
>              Labels: Starter
>
> Although the Spark daemons run fine on Windows with run.cmd, the deploy 
> scripts (bin/start-all.sh and such) don't do so unless you have Cygwin. It 
> would be nice to make .cmd versions of those.



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