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From "Chuan Liu (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 Tue, 25 Jun 2013 21:23:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13693392#comment-13693392
] 

Chuan Liu commented on HADOOP-9660:
-----------------------------------

I think the problem has more to do with the 'hadoop.cmd' scripts than with Powershell.

1) Powershell will remove double quotes in command line arguments. This seems reasonable because
I think some other shells like bash also do the same thing.
2) Cmd will removed “=” unless quoted because '=' is a delimiter in cmd script.
http://ss64.com/nt/syntax-esc.html

The second behavior is really annoying.

                
> [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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