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https://issues.apache.org/jira/browse/YARN-3514?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14528908#comment-14528908
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Wangda Tan commented on YARN-3514:
----------------------------------

[~cnauroth],

bq. I've seen a few mentions online that Active Directory is not case-sensitive 
but is case-preserving. That means it will preserve the case you used in 
usernames, but the case doesn't matter for comparisons. I've also seen 
references that DNS has similar behavior with regards to case.
Good point! I've found one post about this: 
https://msdn.microsoft.com/en-us/library/bb726984.aspx:
bq. Note: Although Windows 2000 stores user names in the case that you enter, 
user names aren't case sensitive. For example, you can access the Administrator 
account with the user name Administrator or administrator. Thus, user names are 
case aware but not case sensitive..

So I think it's safe to make this change too.

> Active directory usernames like domain\login cause YARN failures
> ----------------------------------------------------------------
>
>                 Key: YARN-3514
>                 URL: https://issues.apache.org/jira/browse/YARN-3514
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: nodemanager
>    Affects Versions: 2.2.0
>         Environment: CentOS6
>            Reporter: john lilley
>            Assignee: Chris Nauroth
>            Priority: Minor
>         Attachments: YARN-3514.001.patch, YARN-3514.002.patch
>
>
> We have a 2.2.0 (Cloudera 5.3) cluster running on CentOS6 that is 
> Kerberos-enabled and uses an external AD domain controller for the KDC.  We 
> are able to authenticate, browse HDFS, etc.  However, YARN fails during 
> localization because it seems to get confused by the presence of a \ 
> character in the local user name.
> Our AD authentication on the nodes goes through sssd and set configured to 
> map AD users onto the form domain\username.  For example, our test user has a 
> Kerberos principal of hadoopu...@domain.com and that maps onto a CentOS user 
> "domain\hadoopuser".  We have no problem validating that user with PAM, 
> logging in as that user, su-ing to that user, etc.
> However, when we attempt to run a YARN application master, the localization 
> step fails when setting up the local cache directory for the AM.  The error 
> that comes out of the RM logs:
> 2015-04-17 12:47:09 INFO net.redpoint.yarnapp.Client[0]: monitorApplication: 
> ApplicationReport: appId=1, state=FAILED, progress=0.0, finalStatus=FAILED, 
> diagnostics='Application application_1429295486450_0001 failed 1 times due to 
> AM Container for appattempt_1429295486450_0001_000001 exited with  exitCode: 
> -1000 due to: Application application_1429295486450_0001 initialization 
> failed (exitCode=255) with output: main : command provided 0
> main : user is DOMAIN\hadoopuser
> main : requested yarn user is domain\hadoopuser
> org.apache.hadoop.util.DiskChecker$DiskErrorException: Cannot create 
> directory: 
> /data/yarn/nm/usercache/domain%5Chadoopuser/appcache/application_1429295486450_0001/filecache/10
>                 at 
> org.apache.hadoop.util.DiskChecker.checkDir(DiskChecker.java:105)
>                 at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.download(ContainerLocalizer.java:199)
>                 at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.localizeFiles(ContainerLocalizer.java:241)
>                 at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.runLocalization(ContainerLocalizer.java:169)
>                 at 
> org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer.main(ContainerLocalizer.java:347)
> .Failing this attempt.. Failing the application.'
> However, when we look on the node launching the AM, we see this:
> [root@rpb-cdh-kerb-2 ~]# cd /data/yarn/nm/usercache
> [root@rpb-cdh-kerb-2 usercache]# ls -l
> drwxr-s--- 4 DOMAIN\hadoopuser yarn 4096 Apr 17 12:10 domain\hadoopuser
> There appears to be different treatment of the \ character in different 
> places.  Something creates the directory as "domain\hadoopuser" but something 
> else later attempts to use it as "domain%5Chadoopuser".  I’m not sure where 
> or why the URL escapement converts the \ to %5C or why this is not consistent.
> I should also mention, for the sake of completeness, our auth_to_local rule 
> is set up to map u...@domain.com to domain\user:
> RULE:[1:$1@$0](^.*@DOMAIN\.COM$)s/^(.*)@DOMAIN\.COM$/domain\\$1/g



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