[
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
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
