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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12081) Support Hadoop on zLinux - fix JAAS authentication issue
Date Mon, 20 Jul 2015 10:41:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633408#comment-14633408
] 

Steve Loughran commented on HADOOP-12081:
-----------------------------------------

I'm always worried about going near UGI, but this looks low risk. it extends the 64 bit string
comparison with one for the z390 tag, which would only cause confusion with an OS with the
same tag on a different width architecture.

+1

> Support Hadoop on zLinux - fix JAAS authentication issue
> --------------------------------------------------------
>
>                 Key: HADOOP-12081
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12081
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.6.0
>         Environment: zLinux
>            Reporter: Adam Roberts
>            Assignee: Akira AJISAKA
>              Labels: zlinux
>         Attachments: HADOOP-12081.001.patch
>
>
> Currently the 64 bit check in security/UserGroupInformation.java uses os.arch and checks
for "64". s390x is returned on IBM's z platform: s390x is 64 bit. Without this change, if
we try to use HDFS with Spark, we get a fatal error (unable to login as we can't find a login
class).
> This address fixes said issue by identifying s390x as a 64 bit platform and thus allowing
Spark to run on zLinux. A simple fix with very big implications!



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