GH-369: EL Math functions to allow dynamic reducer calculation
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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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