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From "Stephen Watt (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6941) Hadoop 0.21 will not work on non-SUN JREs due to use of com.sun.security in org/apache/hadoop/security/UserGroupInformation.java
Date Thu, 09 Sep 2010 02:58:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12907510#action_12907510
] 

Stephen Watt commented on HADOOP-6941:
--------------------------------------

@Owen - I'm working on getting Harmony working on Hadoop at present. We're pretty close, and
have workarounds for most issues but the trick is to fix the issues in such a way that we
can create a patch with a resolution that works for all the JREs. 

Yes, there are equivalent classes for both IBM Java and Harmony, so we could do something
whereby it identifies the JRE and then loads the appropriate library, but I'm looking to see
if there is a more extensible approach.

@Nicholas - Yes, Hadoop 0.20.x works just fine on IBM Java. I've submitted patches targeted
for 0.20.3 - see HADOOP-6923 and HADOOP-6924 - that makes Hadoop 0.20.x work cross JRE.  The
com.sun.security.auth classes were introduced with Hadoop 0.21

> Hadoop 0.21 will not work on non-SUN JREs due to use of com.sun.security in org/apache/hadoop/security/UserGroupInformation.java
> --------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-6941
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6941
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>         Environment: SLES 11, Apache Harmony 6 and SLES 11, IBM Java 6
>            Reporter: Stephen Watt
>             Fix For: 0.21.0, 0.21.1, 0.22.0
>
>
> Attempting to format the namenode or attempting to start Hadoop using Apache Harmony
or the IBM Java JREs results in the following exception:
> 10/09/07 16:35:05 ERROR namenode.NameNode: java.lang.NoClassDefFoundError: com.sun.security.auth.UnixPrincipal
> 	at org.apache.hadoop.security.UserGroupInformation.<clinit>(UserGroupInformation.java:223)
> 	at java.lang.J9VMInternals.initializeImpl(Native Method)
> 	at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.setConfigurationParameters(FSNamesystem.java:420)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.<init>(FSNamesystem.java:391)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:1240)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1348)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:1368)
> Caused by: java.lang.ClassNotFoundException: com.sun.security.auth.UnixPrincipal
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:421)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:652)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:346)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:618)
> 	... 8 more
> This is a negative regression as previous versions of Hadoop worked with these JREs

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