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https://issues.apache.org/jira/browse/HADOOP-1660?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arun C Murthy updated HADOOP-1660:
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Fix Version/s: 0.16.0
Status: Patch Available (was: Open)
> add support for native library toDistributedCache
> --------------------------------------------------
>
> Key: HADOOP-1660
> URL: https://issues.apache.org/jira/browse/HADOOP-1660
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Environment: unix (different handling would be required for windows)
> Reporter: Alejandro Abdelnur
> Assignee: Arun C Murthy
> Fix For: 0.16.0
>
> Attachments: HADOOP-1660_0_20080108.patch
>
>
> Currently if a M/R job depends on JNI based component the dynamic library
> must be available in all the task nodes. This is not possible specially when
> you have not control on the cluster machines, just using it as a service.
> It should be possible to specify using the DistributedCache what are the
> native libraries a job needs.
> For example via a new method 'public void addLibrary(Path libraryPath,
> JobConf conf)'.
> The added libraries would make it to the local FS of the task nodes (same way
> as cached resources) but instead been part of the classpath they would be
> copied to a lib directory and that lib directory would be added t the
> LD_LIBRARY_PATH of the task JVM.
> An alternative would be to set the '-Djava.library.path=' task JVM parameter
> to the lib directory above. However, this would break for libraries that
> depend on other libraries as the dependent one would not be in the
> LD_LIBRARY_PATH and the OS would fail to find it as it is not the JVM the one
> doing the load of the dependent one.
> For uncached usage of native libraries, a special directory in the JAR could
> be used for native libraries. But I'd argue that the DistributedCache
> enhancement would be enough, and if somebody wants to use a native library
> s/he should use the DistributedCached. Or a JobConf addLibrary method that
> uses the DistributedCached under the hood at submission time.
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