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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9660) [WINDOWS] Powershell / cmd parses -Dkey=value from command line as [-Dkey, value] which breaks GenericsOptionParser
Date Fri, 28 Jun 2013 21:21:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13695810#comment-13695810
] 

Chris Nauroth commented on HADOOP-9660:
---------------------------------------

Thanks, Enis.  It's a good point about the many years of online documentation and books. 
Without this change, a Windows user might not be able to just paste in those samples and have
it work.

The patch itself looks really good.  Just a couple of minor style nits: the test has a few
lines that need to be wrapped at 80 characters, and the last line would be shorter by importing
{{java.util.Arrays}} instead of spelling out the full class name for each call.

Thanks also for the clarification that passing just -D isn't supported anyway.  With that
aside, I can't think of any other problematic edge cases.

I'd appreciate it if we could get a +1 (or additional feedback) from Chuan or someone else
at Microsoft before I commit this.  I don't know Powershell well enough to know if there are
other edge cases to consider.  :-)
                
> [WINDOWS] Powershell / cmd parses -Dkey=value from command line as [-Dkey, value] which
breaks GenericsOptionParser
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9660
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9660
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: scripts, util
>            Reporter: Enis Soztutar
>            Assignee: Enis Soztutar
>             Fix For: 3.0.0, 2.1.0-beta
>
>         Attachments: hadoop-9660-branch1_v1.patch, hadoop-9660-branch2_v1.patch
>
>
> When parsing parameters to a class implementing Tool, and using ToolRunner, we can pass

> {code}
> bin/hadoop <tool_class> -Dkey=value 
> {code}
> However, powershell parses the '=' sign itself, and sends it to  java as ["-Dkey", "value"]
which breaks GenericOptionsParser. 
> Using "-Dkey=value" or '-Dkey=value' does not fix the problem. The only workaround seems
to trick PS by using: 
> '"-Dkey=value"' (single + double quote)
> In cmd, "-Dkey=value" works, but not '"-Dkey=value"'. 
> http://stackoverflow.com/questions/4940375/how-do-i-pass-an-equal-sign-when-calling-a-batch-script-in-powershell

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