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From "Chaoyu Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14909) Preserve the location of table created with the location clause in table rename
Date Fri, 28 Oct 2016 15:44:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615754#comment-15615754
] 

Chaoyu Tang commented on HIVE-14909:
------------------------------------

[~leftylev] I made the change for this change in https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-RenameTable,
please take a look. Thanks 

> Preserve the location of table created with the location clause in table rename
> -------------------------------------------------------------------------------
>
>                 Key: HIVE-14909
>                 URL: https://issues.apache.org/jira/browse/HIVE-14909
>             Project: Hive
>          Issue Type: Improvement
>          Components: Hive
>    Affects Versions: 1.1.0
>            Reporter: Adriano
>            Assignee: Chaoyu Tang
>             Fix For: 2.2.0
>
>         Attachments: HIVE-14909.1.patch, HIVE-14909.1.patch, HIVE-14909.2.patch, HIVE-14909.3.patch,
HIVE-14909.patch, HIVE-14909.patch
>
>
> Alter Table operation for db_enc.rename_test failed to move data due to: '/hdfs/encrypted_path/db_enc/rename_test
can't be moved from an encryption zone.'
> When Hive renames a managed table, it always creates the new renamed table directory
under its database directory in order to keep a db/table hierarchy. In this case, the renamed
table directory is created under "default db" directory "hive/warehouse/". When Hive renames
a managed table, it always creates the new renamed table directory under its database directory
in order to keep a db/table hierarchy. In this case, the renamed table directory is created
under "default' db directory typically set as /hive/warehouse/ . 
> This error doesn't appear if first create a database which points to a directory outside
/hive/warehouse/, say '/hdfs/encrypted_path', you won't have this problem. For example, 
> create database db_enc location '/hdfs/encrypted_path/db_enc; 
> use db_enc; 
> create table rename_test (...) location '/hdfs/encrypted_path/db_enc/rename_test'; 
> alter table rename_test rename to test_rename; 
> The renamed test_rename directory is created under /hdfs/encrypted_path/db_enc. 
> Considering that the encryption of a filesystem is part of the evolution hardening of
a system (where the system and the data contained can already exists) and a db can be already
created without location set (because it is not strictly required)and the default db is outside
the same encryption zone (or in a no-encryption zone) the alter table rename operation will
fail.
> Improvement:
> Preserve the "parent location" of the table when an "alter table <table> rename
to <newname>" is submitted (the case when the db location is not specified and the Hive
defult db is outside the same encrypted zone).



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