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https://issues.apache.org/jira/browse/PIG-2927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13462392#comment-13462392
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Russell Jurney commented on PIG-2927:
-------------------------------------

Moving from email.

http://stackoverflow.com/a/10083594/13969 shows you the installed path of a 
given gem.

jruby -S gem install mail
jirb
require 'rubygems'
spec = Gem::Specification.find_by_name("mail")
spec.gem_dir

But really... we can just use Bundler right? Its perfect - it expects a user to 
create their own gem environment. http://gembundler.com/ Then there is a list 
of gems in a jruby file, and we can go through that list and get the installed 
location in our bundler environment (which is likely to be in a subdirectory).
                
> SHIP and use JRuby gems in JRuby UDFs
> -------------------------------------
>
>                 Key: PIG-2927
>                 URL: https://issues.apache.org/jira/browse/PIG-2927
>             Project: Pig
>          Issue Type: New Feature
>            Reporter: Russell Jurney
>            Priority: Minor
>
> It would be great to use JRuby gems in JRuby UDFs without installing them on 
> all machines on the cluster. Some way to SHIP them automatically with the job 
> would be great.

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