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Date: Fri, 14 Sep 2012 12:16:07 +1100 (NCT)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HADOOP-8806) libhadoop.so: search
 java.library.path when calling dlopen
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    [ https://issues.apache.org/jira/browse/HADOOP-8806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455512#comment-13455512 ] 

Colin Patrick McCabe commented on HADOOP-8806:
----------------------------------------------

bq. [rpath discussion]

The problem is, we don't know at compile-time where libsnappy.so will be.  Normally there's a "make install" step where rpaths get injected, but there is nothing like that for Hadoop.

Sadly, I have encountered an issue that I think puts the kibosh on the "static libsnappy" idea-- you cannot link a .a into a .so.  I don't know why I didn't think of that earlier.
                
> 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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