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https://issues.apache.org/jira/browse/HADOOP-2838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12717140#action_12717140
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Hemanth Yamijala commented on HADOOP-2838:
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Will it fail mysteriously or will it be easy to know that the failure is 
because of the invalid syntax ? If not, I think it would be useful to make it 
easy to know this is the cause in some way. Maybe through the diagnostic string.

> Add HADOOP_LIBRARY_PATH config setting so Hadoop will include external 
> directories for jni
> ------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2838
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2838
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.16.0
>            Reporter: Owen O'Malley
>            Assignee: Amar Kamat
>             Fix For: 0.21.0
>
>         Attachments: HADOOP-2838-v1.0.patch, HADOOP-2838-v1.1.patch, 
> HADOOP-2838-v2.2-branch-20-example.patch, HADOOP-2838-v2.2.patch
>
>
> Currently there is no way to configure Hadoop to use external JNI 
> directories. I propose we add a new variable like HADOOP_CLASS_PATH that is 
> added to the JAVA_LIBRARY_PATH before the process is run.

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