[jira] [Created] (HIVE-21922) Allow keytabs to be reused in LLAP yarn applications through Yarn localization

["Adam Szita (JIRA)" <ji...@apache.org>]

Adam Szita created HIVE-21922:
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             Summary: Allow keytabs to be reused in LLAP yarn applications through Yarn localization
                 Key: HIVE-21922
                 URL: https://issues.apache.org/jira/browse/HIVE-21922
             Project: Hive
          Issue Type: New Feature
            Reporter: Adam Szita
            Assignee: Adam Szita


In secure clusters LLAP has to be able to reach keytab files for kerberos login.

Currently _hive.llap.task.scheduler.am.registry.keytab.file_ and _hive.llap.daemon.keytab.file_ configs are used to define the path of such keytabs on the Tez AM and LLAP daemon side respectively. Both presume local file system paths only - hence all nodes in the LLAP cluster (even those that eventually don't end up executing a daemon...) have to have Hive's keytab preinstalled on them.
The above is described by this strategy: [Pre-installed_Keytabs_for_AM_and_containers|https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html#Pre-installed_Keytabs_for_AM_and_containers]

Another approach can be [Keytabs_for_AM_and_containers_distributed_via_YARN|https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/YarnApplicationSecurity.html#Keytabs_for_AM_and_containers_distributed_via_YARN] where we rely on HDFS and Yarn resource localization, and no prior keytab distribution is required. I intend to make this strategy an option for Hive-LLAP in this jira.



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