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https://issues.apache.org/jira/browse/PIG-987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763325#action_12763325
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Yan Zhou commented on PIG-987:
------------------------------

I see the following errors in your attached log:

chgrp: changing group of 
`/home/raghu/h/pig-commit/build/contrib/zebra/test/data/TestColumnGroupNullSplits':
 Operation not permitted

So I believen your tests has encountered disk permission problems. Note that we 
are testing the feature of "column group security" so having property 
permission settings is necessary for the tests to pass.

> [zebra] Zebra Column Group Access Control
> -----------------------------------------
>
>                 Key: PIG-987
>                 URL: https://issues.apache.org/jira/browse/PIG-987
>             Project: Pig
>          Issue Type: New Feature
>    Affects Versions: 0.6.0
>            Reporter: Yan Zhou
>            Assignee: Yan Zhou
>         Attachments: ColumnGroupSecurity.patch, ColumnGroupSecurity.patch, 
> TEST-org.apache.hadoop.zebra.io.TestCheckin.txt, 
> TEST-org.apache.hadoop.zebra.mapred.TestCheckin.txt, tmp-987-plus-991.patch
>
>
> Access Control: when processes try to read from the column groups, Zebra 
> should be able to handle allowed vs. disallowed user/application accesses.  
> The security is eventuallt granted by corresponding  HDFS security of the 
> data stored.
> Expected behavior when column group permissions are set:
>     When user selects only columns that they do not have permissions to 
> access, Zebra should return error with message "Error #: Permission denied 
> for accessing column <column name or names> 
> Access control applies to an entire column group, so all columns in a column 
> group have same permissions. 

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