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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-4577) Add Jar "lib" directory to TaskRunner's library.path setting to allow JNI libraries to be deployed via JAR file
Date Wed, 05 Nov 2008 13:51:44 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-4577?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645217#action_12645217
] 

Steve Loughran commented on HADOOP-4577:
----------------------------------------

1. It would be good for the env variable to get set up too, so that you can do transient libraries.
Otherwise a lot of the benefits get lost.

2. It would also be good if the lib/ dir could have subdirs for OS and arch, so that I could
have jar with lib/linux/x8632/something.so, linux/lib/amd64/something.so; the runtime would
select the right shared lib for the platform. This would also make the feature something that
could be tested with a JAR containing a set of platform's shared libraries

> Add Jar "lib" directory to TaskRunner's library.path setting to allow JNI libraries to
be deployed via JAR file  
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-4577
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4577
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>    Affects Versions: 0.18.1
>         Environment: Hadoop 18.1 Cluster with custom JNI shared libraries deployed in
lib directory of deployment JAR.
>            Reporter: Ahad Rana
>            Assignee: Ahad Rana
>             Fix For: 0.18.3
>
>         Attachments: HADOOP-4577-v1.patch
>
>
> It is extremely convenient to be able to deploy JNI libraries utilized in a custom map-reduce
job via the job's JAR file. The TaskRunner already establishes a precedent by automatically
adding any jar files contained in the "lib" directory of the job jar to the child map/reduce
process's classpath. Following this convention, it should also be possible to deploy custom
JNI libraries in the same lib directory. This involves adding the path to the job jar's lib
directory to the VM's library.path setting (after the jar has been expanded in the job cache
directory). This does not elimintate the need add dependent shared libraries that may be referenced
by the JNI libraries to the system's LD_LIBRARY_PATH variable. In our deployment configuration,
we usually pre-install third party shared libraries across the cluster and only deploy our
custom JNI libraries via the job jar.

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