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From "Stephen Watt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6895) Native Libraries do not load if a different platform signature is returned from org.apache.hadoop.util.PlatformName
Date Mon, 02 Aug 2010 21:58:17 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6895?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12894725#action_12894725
] 

Stephen Watt commented on HADOOP-6895:
--------------------------------------

There is a JRE security library exception being thrown when attempting to format the namenode
or starting Hadoop and using IBM Java as the JRE. This makes the patch hard to validate when
testing with IBM Java. I'll write up a JIRA ticket for the security issue and link it to this
one as a dependency.

> Native Libraries do not load if a different platform signature is returned from org.apache.hadoop.util.PlatformName
> -------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6895
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6895
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: native
>         Environment: SLES 10, IBM Java 6, Hadoop 0.21.0-rc0
>            Reporter: Stephen Watt
>            Priority: Minor
>             Fix For: 0.21.0, 0.22.0
>
>         Attachments: HADOOP-6895.patch
>
>   Original Estimate: 0h
>  Remaining Estimate: 0h
>
> bin/hadoop-config.sh has an environment variable called JAVA_PLATFORM which is set to
to the results returned by org.apache.hadoop.util.PlatformName . These results are sometimes
unique to the JRE being used. Although the value returned for 64 Bit Sun/Oracle Java and 64
Bit IBM Java is the same, it is different for the corresponding 32 Bit JREs. 
> The issue is that the value returned is used in creating the path to the native libraries
on disk, i.e ${HADOOP_COMMON_HOME}/lib/native/${JAVA_PLATFORM}
> Since the path on disk is fixed with the Sun JRE value /lib/native/Linux-i386-32 it therefore
fails when it attempts to load the native libraries with the value returned with 32 Bit IBM
Java, /lib/native/Linux-x86-32

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