chendihao created HADOOP-16122:
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Summary: Re-login for multiple Hadoop users without updating
global static UGI attributes
Key: HADOOP-16122
URL: https://issues.apache.org/jira/browse/HADOOP-16122
Project: Hadoop Common
Issue Type: Bug
Components: auth
Reporter: chendihao
In our scenario, we have a service to allow multiple users to access HDFS with
their keytab. The users have different Hadoop user and permission to access the
HDFS files. The service will run with multi-threads and create one independent
UGI object for each user and use the 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 use the static User and static
Subject objects to check the authentication and re-login. In fact, we want to
re-login with the current User and Subject instead of the global static one.
Because of this issue, we can only support multiple Hadoop users to login with
their own keytabs but not re-login when the tickets expire.
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