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https://issues.apache.org/jira/browse/HDFS-9488?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

KWON BYUNGCHANG updated HDFS-9488:
----------------------------------
    Description: 
My environment does not allow add user/group.  I can't rely os user/group 
mechanism.
and I don’t want to show below log.

{code}
2015-11-26 13:21:48,486 WARN  security.UserGroupInformation 
(UserGroupInformation.java:getGroupNames(1521)) - No groups available for user 
hello
{code}

I append {{org.apache.hadoop.security.SimpleUserGroupsMapping}}.

It is very simple.  group of some user is user.  user is same group.

if some users should be  same group, use 
{{hadoop.user.group.static.mapping.overrides=user1=group;user2=group}}

problem is when {{hdfs dfsadmin -refreshUserToGroupsMappings}}, it does not 
reload that config.

Thank you.



  was:
My environment does not allow add user/group.  I can't rely os user/group 
mechanism.
and I don’t want to show below log.

{code}
2015-11-26 13:21:48,486 WARN  security.UserGroupInformation 
(UserGroupInformation.java:getGroupNames(1521)) - No groups available for user 
hello
{code}

I append {{org.apache.hadoop.security.SimpleUserGroupsMapping}}.

It is very simple.  group of some user is user.  user is same group.

if some users should be  same group, use 
{{hadoop.user.group.static.mapping.overrides=user1:group;user2:group}}

problem is when {{hdfs dfsadmin -refreshUserToGroupsMappings}}, it does not 
reload that config.

Thank you.




> When dfsadmin -refreshUserToGroupsMappings,  It does not reload 
> hadoop.user.group.static.mapping.overrides config.
> ------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9488
>                 URL: https://issues.apache.org/jira/browse/HDFS-9488
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 2.7.1
>            Reporter: KWON BYUNGCHANG
>            Priority: Minor
>         Attachments: HDFS-9488.01.patch
>
>
> My environment does not allow add user/group.  I can't rely os user/group 
> mechanism.
> and I don’t want to show below log.
> {code}
> 2015-11-26 13:21:48,486 WARN  security.UserGroupInformation 
> (UserGroupInformation.java:getGroupNames(1521)) - No groups available for 
> user hello
> {code}
> I append {{org.apache.hadoop.security.SimpleUserGroupsMapping}}.
> It is very simple.  group of some user is user.  user is same group.
> if some users should be  same group, use 
> {{hadoop.user.group.static.mapping.overrides=user1=group;user2=group}}
> problem is when {{hdfs dfsadmin -refreshUserToGroupsMappings}}, it does not 
> reload that config.
> Thank you.



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