[jira] [Assigned] (HIVE-15780) HiveConf evaluation and management

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

     [ https://issues.apache.org/jira/browse/HIVE-15780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

anishek reassigned HIVE-15780:
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> HiveConf evaluation and management
> ----------------------------------
>
>                 Key: HIVE-15780
>                 URL: https://issues.apache.org/jira/browse/HIVE-15780
>             Project: Hive
>          Issue Type: Improvement
>          Components: HiveServer2
>            Reporter: anishek
>            Assignee: anishek
>
> This is a placeholder Jira to see if HiveConf class can be rewired to give better performance and security.
> * most of the variables in hive can be changed by the user, there are few variables that are part of the "hive.conf.restricted.list" configuration, with recent additions via HIVE-15713. Extending the list to include more admin / cluster wide variables should be included.
> * By default any new variable that is created is available for end user to change, given this is a huge list and a lot them are cluster wide configurations, it would be better that any instance of variables in hiveconf should be part of system / restricted list with additional parameter during object instance creation to include if user can change it. 
> * since this class extends hadoop Configuration class any _get*_ method called on instance of HiveConf is evaluated for variable substitution etc, this is not required except for few variables like "hive.downloaded.resources.dir", hence the class could just have a map of most of the properties which should help in faster configuration lookup. 
> * for every session we create a new instance of hiveconf, if we can segregate the conf's into system level / user level etc then have some sort of composite pattern to represent hive conf such that a  single instance of system configuration is used across sessions.



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