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From "Stephen Watt (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6923) Native Libraries do not load if a different platform signature is returned from org.apache.hadoop.util.PlatformName
Date Tue, 24 Aug 2010 19:50:17 GMT
Native Libraries do not load if a different platform signature is returned from org.apache.hadoop.util.PlatformName
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                 Key: HADOOP-6923
                 URL: https://issues.apache.org/jira/browse/HADOOP-6923
             Project: Hadoop Common
          Issue Type: Bug
          Components: native
    Affects Versions: 0.20.2, 0.20.1, 0.20.0
         Environment: SLES 10, IBM Java 6, Apache Hadoop 0.20.x
            Reporter: Stephen Watt
             Fix For: 0.20.3


The bin/hadoop script 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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