hadoop-common-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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 01:41:08 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13455525#comment-13455525
] 

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

{quote}
bq.     you cannot link a .a into a .so

Sure you can. You can always use ar to pull out the objects and then include them into your
own library.
{quote}
Only if the objects were compiled {{-fPIC}} and any other requirements are met.  My understanding
is that PIC is still an issue in the amd64 ABI but I'd have to go check to make sure...

I'd strongly recommend that we continue to dynamically link against libsnappy.so, using LD_LIBRARY_PATH
if at all possible, but even parsing {{java.library.path}} and iterating it to dlopen would
be OK.
                
> 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?

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message