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From "Andy Isaacson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8806) libhadoop.so: search java.library.path when calling dlopen
Date Fri, 14 Sep 2012 01:56:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455531#comment-13455531
] 

Andy Isaacson commented on HADOOP-8806:
---------------------------------------

Another potential issue -- there is plenty of fun debugging waiting for the first developer
who tries to have a dynamic libsnappy.so and a static snappy.a-in-libhadoop.so in the same
executable.  Supposedly that scenario can be made to work, but I've had no end of trouble
with similar scenarios previously.
                
> libhadoop.so: search java.library.path when calling dlopen
> ----------------------------------------------------------
>
>                 Key: HADOOP-8806
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8806
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Colin Patrick McCabe
>            Priority: Minor
>
> libhadoop calls {{dlopen}} to load {{libsnappy.so}} and {{libz.so}}.  These libraries
can be bundled in the {{$HADOOP_ROOT/lib/native}} directory.  For example, the {{-Dbundle.snappy}}
build option copies {{libsnappy.so}} to this directory.  However, snappy can't be loaded from
this directory unless {{LD_LIBRARY_PATH}} is set to include this directory.
> Should we also search {{java.library.path}} when loading these libraries?

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