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https://issues.apache.org/jira/browse/MAPREDUCE-5890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14037046#comment-14037046
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Arun Suresh commented on MAPREDUCE-5890:
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[~tucu00],

Yup, I did not find any better way of doing this.. 
I have combined the code and test case into a single patch. I have also run the 
test case locally varying the number of Maps and Reduces.. It works fine..



> Support for encrypting Intermediate data and spills in local filesystem
> -----------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5890
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5890
>             Project: Hadoop Map/Reduce
>          Issue Type: New Feature
>          Components: security
>    Affects Versions: 2.4.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Arun Suresh
>              Labels: encryption
>         Attachments: MAPREDUCE-5890.3.patch
>
>
> For some sensitive data, encryption while in flight (network) is not 
> sufficient, it is required that while at rest it should be encrypted. 
> HADOOP-10150 & HDFS-6134 bring encryption at rest for data in filesystem 
> using Hadoop FileSystem API. MapReduce intermediate data and spills should 
> also be encrypted while at rest.



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