Configuration of Pig
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Key: PIG-111
URL: https://issues.apache.org/jira/browse/PIG-111
Project: Pig
Issue Type: Improvement
Reporter: Craig Macdonald
This JIRA discusses issues relating to the configuration of Pig.
Uses cases:
1. I want to configure Pig programatically from Java
Motivation: pig can be embedded from another Java program, and configuration
should be accessible to be set by the client code
2. I want to configure Pig from the command line
3. I want to configure Pig from the Pig shell (Grunt)
4. I want Pig to remember my configuration for every Pig session
Motivation: to save me typing in some configuration stuff every time.
5. I want Pig to remember my configuration for this script.
Motivation: I must use a common configuration for 50% of my Pig scripts - can
I share this configuration between scripts.
Current Status:
* Pig uses System properties for some configuration
* A configuration properties object in PigContext is not used.
* pigrc can contain properties
* Configuration properties can not be set from Grunt
Proposed solutions to use cases:
1. Configuration should be set in PigContext, and accessible from client code.
2. System properties are copied to PigContext, or can be specified on the
command line (duplication with System properties)
3. Allow configuration properties to be set using the "set" command in Grunt
4. Pigrc can contain properties. Is this enough, or can other configuration
stuff be set, eg aliases, imports, etc.
5. Add an include directive to pig, to allow a shared configuration/Pig script
to be included.
Connections to Shell scripting:
* The source command in Bash allows another bash script file to be included -
this allows shared variables to be set in one file shared between a set of
scripts.
* Aliases can be set, according to user preferences, etc.
* All this can be done in your .bashrc file
Issues:
* What happens when you change a property after the property has been read?
* Can Grunt read a pigrc containing various statements etc before the
PigServer is completely configured?
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