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From "Nemon Lou (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12464) Inconsistent behavior between MapReduce and Spark engine on bucket mapjoin
Date Thu, 19 Nov 2015 10:33:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15013299#comment-15013299
] 

Nemon Lou commented on HIVE-12464:
----------------------------------

HIVE-10866 shows that inserting into a non-empty bucket table is not supported.
However ,the query result is right when using mapReduce without mapjoin hint.

> Inconsistent behavior between MapReduce and Spark engine on bucket mapjoin
> --------------------------------------------------------------------------
>
>                 Key: HIVE-12464
>                 URL: https://issues.apache.org/jira/browse/HIVE-12464
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning, Spark
>    Affects Versions: 1.2.1
>            Reporter: Nemon Lou
>
> Steps to reproduce:
> 1,prepare the table and data
> {noformat}
> create table if not exists lxw_test(imei string,sndaid string,data_time string)
> CLUSTERED BY(imei) SORTED BY(imei) INTO 10 BUCKETS;
> create table if not exists lxw_test1(imei string,sndaid string,data_time string)
> CLUSTERED BY(imei) SORTED BY(imei) INTO 5 BUCKETS;
> set hive.enforce.bucketing = true;
> set hive.enforce.sorting = true;
> insert overwrite table lxw_test
> values(1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7),(8,8,8),(9,9,9),(10,10,10);
> insert overwrite table lxw_test1
> values (1,1,1),(2,2,2),(3,3,3),(4,4,4),(5,5,5),(6,6,6),(7,7,7),(8,8,8),(9,9,9),(10,10,10);
> set hive.enforce.bucketing;
> insert into table lxw_test1 select * from lxw_test;
> set hive.optimize.bucketmapjoin = true;
> set hive.optimize.bucketmapjoin.sortedmerge = true;
> set hive.input.format=org.apache.hadoop.hive.ql.io.BucketizedHiveInputFormat;
> {noformat}
> 2,the following sql will success :
> {noformat}
> set hive.execution.engine=mr;
> explain select  count(1) 
> from lxw_test1 a 
> join lxw_test b 
> on a.imei = b.imei ;
> {noformat}
> 3,this one will fail :
> {noformat}
> set hive.execution.engine=spark;
> explain select  count(1) 
> from lxw_test1 a 
> join lxw_test b 
> on a.imei = b.imei ;
> {noformat}
> On spark,the query returns this error:
> {noformat}
> 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 lxw_test1 is 5, whereas
the number of files is 10 (state=42000,code=10141)
> {noformat}
> 4,After set hive.ignore.mapjoin.hint=false and use mapjoin hint,the MapReduce engine
return the same error.
> {noformat}
> set hive.execution.engine=mr;
> set hive.ignore.mapjoin.hint=false;
> explain
> select /*+ mapjoin(b) */ count(1) 
> from lxw_test1 a 
> join lxw_test b 
> on a.imei = b.imei ;
> {noformat}



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