[jira] [Commented] (SAMZA-40) Refactor Samza configuration

["Chris Riccomini (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SAMZA-40?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14167136#comment-14167136 ] 

Chris Riccomini commented on SAMZA-40:
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Related to validation, we could add a .validate(Config config) method on all of our factories. When the JobRunner kicks a job off, it could iterate over every config key, looking for .class/.factory, then create the factory, and call .validate(Config config) on it. This would fully validate all configs immediately, rather than having runtime exceptions, as we have now.

> Refactor Samza configuration
> ----------------------------
>
>                 Key: SAMZA-40
>                 URL: https://issues.apache.org/jira/browse/SAMZA-40
>             Project: Samza
>          Issue Type: Bug
>          Components: container
>    Affects Versions: 0.6.0
>            Reporter: Chris Riccomini
>              Labels: project
>
> Samza's configuration system has several problems that we need to resolved.
> * Want to auto-generate documentation based off of configuration.
> * Should support global defaults for a config property. Right now, we do config.getFoo.getOrElse() everywhere.
> * Should validate config up front, rather than thrown runtime exceptions randomly throughout the code.
> * We are mixing wiring and configuration together. How do other systems handle this?
> * We have fragmented configuration (anybody can define configuration). How do other systems handle this?
> * How to handle undefined configuration? How to make this interoperable with both Java and Scala (i.e. should we support Option in Scala)?
> * Should remain immutable.
> * Should remove implicits. It's just confusing.
> * Do we want to support complex types (list, map) for values, not just String?
> We need a design proposal for this.



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