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From "Stephen Watt (JIRA)" <j...@apache.org>
Subject [jira] Created: (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 20:01:20 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-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


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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