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Posted to common-issues@hadoop.apache.org by "chendihao (JIRA)" <ji...@apache.org> on 2019/02/20 04:06:00 UTC
[jira] [Updated] (HADOOP-16122) Re-login from keytab for multiple
UGI will use the same and incorrect keytabPrincipal
[ https://issues.apache.org/jira/browse/HADOOP-16122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
chendihao updated HADOOP-16122:
-------------------------------
Summary: Re-login from keytab for multiple UGI will use the same and incorrect keytabPrincipal (was: Re-login from keytab for multiple Hadoop users does not work)
> 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 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 re-login with the wrong users 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 but not re-login when the tickets expire.
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