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https://issues.apache.org/jira/browse/HADOOP-16122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773647#comment-16773647
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Eric Yang commented on HADOOP-16122:
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{quote}`loginUserFromKeytabAndReturnUGI()` which allows users to create
multiple UGI and we can login with multiple keytab at the same process{quote}
The purpose of loginUserFromKeytabAndReturnUGI is designed for long running
process to login new kerberos session when max life time has been reached. It
is not intended to login with multiple keytabs to obtain ugi of other users.
{quote}I hope we can fix this if it is identified as bug even though it is not
the best and secured solution for all users.{quote}
This is not a bug and it is working as designed.
> Re-login from keytab for multiple UGI will use the same and incorrect
> keytabPrincipal
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-16122
> URL: https://issues.apache.org/jira/browse/HADOOP-16122
> Project: Hadoop Common
> Issue Type: Bug
> Components: auth
> Reporter: chendihao
> Priority: Major
>
> In our scenario, we have a service to allow multiple users to access HDFS
> with their keytab. The users use different Hadoop user and permission to
> access the HDFS files. This service will run with multi-threads and create
> independent UGI object for each user and use its own UGI to create Hadoop
> FileSystem object to read/write HDFS.
>
> Since we have multiple Hadoop users in the same process, we have to use
> `loginUserFromKeytabAndReturnUGI` instead of `loginUserFromKeytab`. The
> `loginUserFromKeytabAndReturnUGI` will not do the re-login automatically.
> Then we have to call `checkTGTAndReloginFromKeytab` or `reloginFromKeytab`
> before the kerberos ticket expires.
>
> The issue is that `reloginFromKeytab` will always re-login with the same and
> incorrect keytab instead of the one from the expected UGI object. Because of
> this issue, we can only support multiple Hadoop users to login with their own
> keytabs at the first time but not re-login when the tickets expire. The logic
> of login and re-login is slightly different especially for updating the
> global static properties and it may be the bug of the implementation of that.
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