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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-2758) Metastore is caching too aggressively
Date Thu, 02 Feb 2012 00:39:55 GMT

    [ https://issues.apache.org/jira/browse/HIVE-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13198384#comment-13198384
] 

Hudson commented on HIVE-2758:
------------------------------

Integrated in Hive-trunk-h0.21 #1238 (See [https://builds.apache.org/job/Hive-trunk-h0.21/1238/])
    HIVE-2758 Metastore is caching too aggressively (Kevin Wilfong reviewed by Carl Steinbach)

kevinwilfong : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1239232
Files : 
* /hive/trunk/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
* /hive/trunk/metastore/src/test/org/apache/hadoop/hive/metastore/TestHiveMetaStore.java

                
> 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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