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https://issues.apache.org/jira/browse/HADOOP-6871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12996893#comment-12996893
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Hadoop QA commented on HADOOP-6871:
-----------------------------------

+1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12450115/HADOOP-6871-1.patch
  against trunk revision 1071364.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 3 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac 
compiler warnings.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) 
warnings.

    +1 release audit.  The applied patch does not increase the total number of 
release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

    +1 system test framework.  The patch passed system test framework compile.

Test results: 
https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/268//testReport/
Findbugs warnings: 
https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/268//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: 
https://hudson.apache.org/hudson/job/PreCommit-HADOOP-Build/268//console

This message is automatically generated.

> When the value of a configuration key is set to its unresolved form, it 
> causes the IllegalStateException in Configuration.get() stating that 
> substitution depth is too large.
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6871
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6871
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: conf
>            Reporter: Arvind Prabhakar
>         Attachments: HADOOP-6871-1.patch, HADOOP-6871.patch
>
>
> When a configuration value is set to its unresolved expression string, it 
> leads to recursive substitution attempts in 
> {{Configuration.substituteVars(String)}} method until the max substitution 
> check kicks in and raises an IllegalStateException indicating that the 
> substitution depth is too large. For example, the configuration key 
> "{{foobar}}" with a value set to "{{$\{foobar\}}}" will cause this behavior. 
> While this is not a usual use case, it can happen in build environments where 
> a property value is not specified and yet being passed into the test 
> mechanism leading to failures due to this limitation.

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