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From "Yongzhi Chen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-10866) Throw error when client try to insert into bucketed table
Date Fri, 29 May 2015 18:46:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-10866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565205#comment-14565205
] 

Yongzhi Chen commented on HIVE-10866:
-------------------------------------

The bucket enforcing seems totally broken. Even insert overwrite does not work properly now.


> Throw error when client try to insert into bucketed table
> ---------------------------------------------------------
>
>                 Key: HIVE-10866
>                 URL: https://issues.apache.org/jira/browse/HIVE-10866
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Yongzhi Chen
>            Assignee: Yongzhi Chen
>
> Currently, hive does not support appends(insert into) bucketed table, see open jira HIVE-3608.
When insert into such table, the data will be "corrupted" and not fit for bucketmapjoin. 
> We need find a way to prevent client from inserting into such table.
> Reproduce:
> {noformat}
> CREATE TABLE IF NOT EXISTS buckettestoutput1( 
> data string 
> )CLUSTERED BY(data) 
> INTO 2 BUCKETS 
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
> CREATE TABLE IF NOT EXISTS buckettestoutput2( 
> data string 
> )CLUSTERED BY(data) 
> INTO 2 BUCKETS 
> ROW FORMAT DELIMITED FIELDS TERMINATED BY ',';
> set hive.enforce.bucketing = true; 
> set hive.enforce.sorting=true;
> insert into table buckettestoutput1 select code from sample_07 where total_emp < 134354250
limit 10;
> After this first insert, I did:
> set hive.auto.convert.sortmerge.join=true; 
> set hive.optimize.bucketmapjoin = true; 
> set hive.optimize.bucketmapjoin.sortedmerge = true; 
> set hive.auto.convert.sortmerge.join.noconditionaltask=true;
> 0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join buckettestoutput2
b on (a.data=b.data);
> +-------+-------+
> | data  | data  |
> +-------+-------+
> +-------+-------+
> So select works fine. 
> Second insert:
> 0: jdbc:hive2://localhost:10000> insert into table buckettestoutput1 select code from
sample_07 where total_emp >= 134354250 limit 10;
> No rows affected (61.235 seconds)
> Then select:
> 0: jdbc:hive2://localhost:10000> select * from buckettestoutput1 a join buckettestoutput2
b on (a.data=b.data);
> Error: Error while compiling statement: FAILED: SemanticException [Error 10141]: Bucketed
table metadata is not correct. Fix the metadata or don't use bucketed mapjoin, by setting
hive.enforce.bucketmapjoin to false. The number of buckets for table buckettestoutput1 is
2, whereas the number of files is 4 (state=42000,code=10141)
> 0: jdbc:hive2://localhost:10000>
> {noformat}
> Insert into empty table or partition will be fine, but insert into the non-empty one
(after second insert in the reproduce), the bucketmapjoin will throw an error. We should not
let second insert succeed. 



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