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From "caofangkun (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4367) enhance TRUNCATE syntex to drop data of external table
Date Thu, 18 Apr 2013 06:55:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13634911#comment-13634911
] 

caofangkun commented on HIVE-4367:
----------------------------------

Hi [~teddy.choi] ,Sorry for that I did not notice  you have assigned this issue when I upload
the patch. I'm not a committer yet,so please feel free and assign this issue.
Thank you.


                
> enhance  TRUNCATE syntex  to drop data of external table
> --------------------------------------------------------
>
>                 Key: HIVE-4367
>                 URL: https://issues.apache.org/jira/browse/HIVE-4367
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>    Affects Versions: 0.11.0
>            Reporter: caofangkun
>            Priority: Minor
>         Attachments: HIVE-4367-1.patch
>
>
> In my use case ,
> sometimes I have to remove data of external tables to free up storage space of the cluster
.
> So it's necessary for to enhance the syntax like 
> "TRUNCATE TABLE srcpart_truncate PARTITION (dt='201130412') FORCE;"
> to remove data from EXTERNAL table.
> And I add a configuration property to enable remove data to Trash 
> <property>
>   <name>hive.truncate.skiptrash</name>
>   <value>false</value>
>   <description>
>      if true will remove data to trash, else false drop data immediately
>   </description>
> </property>
> For example :
> hive (default)> TRUNCATE TABLE external1 partition (ds='11'); 
> FAILED: Error in semantic analysis: Cannot truncate non-managed table external1
> hive (default)> TRUNCATE TABLE external1 partition (ds='11') FORCE;
> [2013-04-16 17:15:52]: Compile Start 
> [2013-04-16 17:15:52]: Compile End
> [2013-04-16 17:15:52]: OK
> [2013-04-16 17:15:52]: Time taken: 0.413 seconds
> hive (default)> set hive.truncate.skiptrash;
> hive.truncate.skiptrash=false
> hive (default)> set hive.truncate.skiptrash=true; 
> hive (default)> TRUNCATE TABLE external1 partition (ds='12') FORCE;
> [2013-04-16 17:16:21]: Compile Start 
> [2013-04-16 17:16:21]: Compile End
> [2013-04-16 17:16:21]: OK
> [2013-04-16 17:16:21]: Time taken: 0.143 seconds
> hive (default)> dfs -ls /user/test/.Trash/Current/; 
> Found 1 items
> drwxr-xr-x -test supergroup 0 2013-04-16 17:06 /user/test/.Trash/Current/ds=11

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