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https://issues.apache.org/jira/browse/HADOOP-2838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715563#action_12715563
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Todd Lipcon commented on HADOOP-2838:
-------------------------------------
Using a comma separated conf variable here seems slightly dangerous. I imagine
there must be some cases where people want to pass commas as part of their
environment. I don't have a concrete example, but it seems it's only a matter
of time until some streaming application comes along and really needs a comma
in its environment, and then we're stuck dealing with escaping, etc.
What about using the entire mapred.child.env namespace, and iterating over it?
So mapred.child.env.LD_LIBRARY_PATH would hold the value for that environment
variable.
Unfortunately this would either involve iterating over and filtering all of the
conf vars, or switching the "Properties" class used for storage inside
Configuration to be a SortedMap so we can do a prefix match. I don't
particularly like the former, and the latter is a bigger change, but the
interface does seem simpler and also more robust. For example, a sysadmin could
set a final property of LD_LIBRARY_PATH="path/to/some.so" to provide some kind
of security sandboxing while still allowing the user to modify other variables
in the environment.
> 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
> Attachments: HADOOP-2838-v1.0.patch, HADOOP-2838-v1.1.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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