[jira] [Reopened] (OOZIE-260) GH-369: EL Math functions to allow dynamic reducer calculation

["Roman Shaposhnik (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OOZIE-260?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Roman Shaposhnik reopened OOZIE-260:
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> GH-369: EL Math functions to allow dynamic reducer calculation
> --------------------------------------------------------------
>
>                 Key: OOZIE-260
>                 URL: https://issues.apache.org/jira/browse/OOZIE-260
>             Project: Oozie
>          Issue Type: Bug
>            Reporter: Hadoop QA
>
> I'm proposing adding a MathFunctions class to define EL functions which will allow dynamic reducer calculations. Specifically: min, max, round, toLong. I can add others if people think they would be useful.
> I was thinking that the reducer calculation would look something like this in the workflow.xml:
>     <property>
>       <name>mapred.reduce.tasks</name>
>       <value>${min(round(fs:dirSize(processing_dir) / 128000), 100)}</value>
>     </property>
> For the background on this request, here is the email thread with Alejandro: http://tech.groups.yahoo.com/group/Oozie-users/message/753
> I'll post when I have the code changes finished and tested.

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