[jira] [Commented] (HIVE-2758) Metastore is caching too aggressively

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

    [ https://issues.apache.org/jira/browse/HIVE-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197997#comment-13197997 ] 

Phabricator commented on HIVE-2758:
-----------------------------------

kevinwilfong has commented on the revision "HIVE-2758 [jira] Metastore is caching too aggressively".

  Thanks, Carl.  I got it.

REVISION DETAIL
  https://reviews.facebook.net/D1491

                
> Metastore is caching too aggressively
> -------------------------------------
>
>                 Key: HIVE-2758
>                 URL: https://issues.apache.org/jira/browse/HIVE-2758
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>             Fix For: 0.9.0
>
>         Attachments: HIVE-2758.D1491.1.patch, HIVE-2758.D1491.2.patch
>
>
> The metastore is caching values, like table names and locations too aggressively, leading to inconsistencies across Hive clients and metastore Thrift servers.
> For example, open two Hive clients, in each call
> DESCRIBE FORMATTED table_foo;
> Then in one of those clients, execute
> ALTER TABLE table_foo RENAME TO table_bar;
> Then in both clients call
> DESCRIBE FORMATTED table_bar;
> In the client that executed the alter command, the location is correct, however, in the other Hive client, it will still show the original location of table_foo.
> A similar experiment can be done using metastore Thrift servers, substituting get_table for DESCRIBE FORMATTED and alter_table for ALTER TABLE ... RENAME TO.
> On the Thrift server you can see that the one which did not execute the alter command, not only returns the wrong location, despite calling get_table('table_bar') it will return a table that still has the name table_foo.

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