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From Sergio Peña (JIRA) <j...@apache.org>
Subject [jira] [Commented] (HIVE-14074) RELOAD FUNCTION should update dropped functions
Date Wed, 22 Jun 2016 16:04:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15344618#comment-15344618
] 

Sergio Peña commented on HIVE-14074:
------------------------------------

[~ayousufi] is this thread-safe? I see that {{FunctionRegistry.unregisterPermanentFunctions(}}
has a lock/unlock block while the functions are deleted, but what would happen while functions
are added back? During the time where functions are added, then we do not have any function
on the DB, will other users have issues with queries that use functions that were deleted
for a short period of time?

> RELOAD FUNCTION should update dropped functions
> -----------------------------------------------
>
>                 Key: HIVE-14074
>                 URL: https://issues.apache.org/jira/browse/HIVE-14074
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.0.1
>            Reporter: Abdullah Yousufi
>            Assignee: Abdullah Yousufi
>             Fix For: 2.2.0
>
>         Attachments: HIVE-14074.01.patch
>
>
> Due to HIVE-2573, functions are stored in a per-session registry and only loaded in from
the metastore when hs2 or hive cli is started. Running RELOAD FUNCTION in the current session
is a way to force a reload of the functions, so that changes that occurred in other running
sessions will be reflected in the current session, without having to restart the current session.
However, while functions that are created in other sessions will now appear in the current
session, functions that have been dropped are not removed from the current session's registry.
It seems inconsistent that created functions are updated while dropped functions are not.



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