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From "Pallavi Rao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-1573) Supply user-defined properties to Oozie workflows during schedule
Date Fri, 06 Nov 2015 04:46:27 GMT

    [ https://issues.apache.org/jira/browse/FALCON-1573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14993103#comment-14993103
] 

Pallavi Rao commented on FALCON-1573:
-------------------------------------

Agree that this will make the property names a little more verbose. But, I still feel we should
namespace falcon properties and distinguish Falcon system properties from user properties.
If we namespace Falcon user properties, then, we won't need to worry about users defining
properties that clash with existing Falcon system properties (both before and after namespacing
the existing properties).

In my mind, It is a tradeoff between simplicity and clarity of intent. As you suggested, we
can open it up for a broader discussion.

> Supply user-defined properties to Oozie workflows during schedule
> -----------------------------------------------------------------
>
>                 Key: FALCON-1573
>                 URL: https://issues.apache.org/jira/browse/FALCON-1573
>             Project: Falcon
>          Issue Type: New Feature
>          Components: oozie
>    Affects Versions: trunk
>            Reporter: Daniel del Castillo
>            Assignee: Daniel del Castillo
>            Priority: Minor
>             Fix For: trunk
>
>         Attachments: FALCON-1573-v1.patch, FALCON-1573-v2.patch, FALCON-1573-v3.patch
>
>
> The work in FALCON-1434 added the ability to specify properties for the purpose of enabling
scheduler selection. However, this could be more generally useful as a means for users to
submit custom properties that will be visible in Oozie workflows.
> This will enable users to reference properties in the entity XML itself and passing these
properties down to workflows. For example, a process scheduled with the command:
> {code}
> bin/falcon entity -schedule -type process -name helloFalconProcess -properties custom.property:HEY
> {code}
> can reference the property _custom.property_ in the process XML as
> {code:xml}
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> <process name="helloFalconProcess" xmlns="uri:falcon:process:0.1">
>   ...
>   <properties>
>     ...
>     <property name="customProperty" value="${coord:conf('custom.property')}"/>
>     ...
>   </properties>
>   ...
> </process>
> {code}
> An Oozie workflow can then easily make use of such property:
> {code:xml}
> <workflow-app xmlns="uri:oozie:workflow:0.4" name="hello-falcon-wf">
>   ...
>     <java>
>       ...
>       <arg>--customValue=${customProperty}</arg>
>       ...
>     </java>
>     ...
> </workflow-app>
> {code}



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