Richard Ding updated PIG-879:

    Attachment: PIG-879.patch

This patch implements the option 1 of the above comment and is for 
load-store-redesign branch.

> Pig should provide a way for input location string in load statement to be 
> passed as-is to the Loader
> -----------------------------------------------------------------------------------------------------
>                 Key: PIG-879
>                 URL: https://issues.apache.org/jira/browse/PIG-879
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.3.0
>            Reporter: Pradeep Kamath
>            Assignee: Richard Ding
>         Attachments: PIG-879.patch
>  Due to multiquery optimization, Pig always converts the filenames to 
> absolute URIs (see 
> http://wiki.apache.org/pig/PigMultiQueryPerformanceSpecification - section 
> about Incompatible Changes - Path Names and Schemes). This is necessary since 
> the script may have "cd .." statements between load or store statements and 
> if the load statements have relative paths, we would need to convert to 
> absolute paths to know where to load/store from. To do this 
> QueryParser.massageFilename() has the code below[1] which basically gives the 
> fully qualified hdfs path
> However the issue with this approach is that if the filename string is 
> something like 
> "hdfs://localhost.localdomain:39125/user/bla/1,hdfs://localhost.localdomain:39125/user/bla/2",
>  the code below[1] actually translates this to 
> hdfs://localhost.localdomain:38264/user/bla/1,hdfs://localhost.localdomain:38264/user/bla/2
>  and throws an exception that it is an incorrect path.
> Some loaders may want to interpret the filenames (the input location string 
> in the load statement) in any way they wish and may want Pig to not make 
> absolute paths out of them.
> There are a few options to address this:
> 1)    A command line switch to indicate to Pig that pathnames in the script 
> are all absolute and hence Pig should not alter them and pass them as-is to 
> Loaders and Storers. 
> 2)    A keyword in the load and store statements to indicate the same intent 
> to pig
> 3)    A property which users can supply on cmdline or in pig.properties to 
> indicate the same intent.
> 4)    A method in LoadFunc - relativeToAbsolutePath(String filename, String 
> curDir) which does the conversion to absolute - this way Loader can chose to 
> implement it as a noop.
> Thoughts?

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