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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4235) CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists
Date Fri, 29 Mar 2013 19:47:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13617654#comment-13617654
] 

Hudson commented on HIVE-4235:
------------------------------

Integrated in Hive-trunk-h0.21 #2035 (See [https://builds.apache.org/job/Hive-trunk-h0.21/2035/])
    HIVE-4235. CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists. (Gang
Tim Liu via kevinwilfong) (Revision 1462373)

     Result = FAILURE
kevinwilfong : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1462373
Files : 
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/SemanticAnalyzer.java

                
> CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists
> ------------------------------------------------------------------------
>
>                 Key: HIVE-4235
>                 URL: https://issues.apache.org/jira/browse/HIVE-4235
>             Project: Hive
>          Issue Type: Bug
>          Components: JDBC, Query Processor, SQL
>            Reporter: Gang Tim Liu
>            Assignee: Gang Tim Liu
>             Fix For: 0.11.0
>
>         Attachments: HIVE-4235.patch.1
>
>
> CREATE TABLE IF NOT EXISTS uses inefficient way to check if table exists.
> It uses Hive.java's getTablesByPattern(...) to check if table exists. It involves regular
expression and eventually database join. Very efficient. It can cause database lock time increase
and hurt db performance if a lot of such commands hit database.
> The suggested approach is to use getTable(...) since we know tablename already

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