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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