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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1333) API interface to Pig
Date Fri, 26 Mar 2010 21:22:27 GMT
API interface to Pig
--------------------

                 Key: PIG-1333
                 URL: https://issues.apache.org/jira/browse/PIG-1333
             Project: Pig
          Issue Type: Improvement
            Reporter: Olga Natkovich
             Fix For: 0.8.0


It would be nice to make Pig more friendly for applications like workflow that would be executing
pig scripts on user behalf.

Currently, they would have to use pig command line to execute the code; however, this has
limitation on the kind of output that would be delivered. For instance, it is hard to produce
error information that is easy to use programatically or collect statistics.

The proposal is to create a class that mimics the behavior of the Main but gives users a status
object back. The the main code of pig would look somethig like:

public static void main(String args[])
{
    PigStatus ps = PigMain.exec(args);
    exit (PigStatus.rc);
}

We need to define the following:

- Content of PigStatus. It should at least include
   * return code
   * error string
   * exception 
   * statistics
- A way to propagate the status class through pig code

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