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Pig, mail # user - Passing command line arguments


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Re: Passing command line arguments
Serega Sheypak 2013-12-06, 16:36
Mapred. Child.Java.opts
06.12.2013 20:32 пользователь "praveenesh kumar" <[EMAIL PROTECTED]>
написал:

> Hi all,
>
> I am using my custom build class and my UDF is acting as wrapper.
> I need to pass the command line argument to my UDF, which can be passed
> down to the actual class that needs it.
>
> One way would be to use the standard command line passing method and pass
> the parameter via constructors down to the class which needs it. But that
> doesn't seems to be the right way to me as it requires too much of code
> changes, I want to keep my UDF as a separate entity.
>
> Other way (which I am using) is defining the external parameter as system
> variable and calling System.getenv( ), get that parameter, which is also
> not that ideal as it requires hard-coding the variable on all hadoop nodes.
>
> What I am trying to look, something which I can pass via something like Pig
> -D<my parameter=value> and use System.getProperty( ) method to get that
> parameter.
> But I am not able to find the property. I was wondering is there a way I
> can use some other method or alternative to pass the command line variable
> using Pig -D method or how pig UDFs are called behind the scenes so that I
> can think of some other alternative.
>
> Regards
> Praveenesh
>