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https://issues.apache.org/jira/browse/HIVE-14112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yuming Wang resolved HIVE-14112.
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Resolution: Won't Fix
> Join a HBase mapped big table shouldn't convert to MapJoin
> ----------------------------------------------------------
>
> Key: HIVE-14112
> URL: https://issues.apache.org/jira/browse/HIVE-14112
> Project: Hive
> Issue Type: Bug
> Components: StorageHandler
> Affects Versions: 1.1.0, 1.2.0
> Reporter: Yuming Wang
> Assignee: Yuming Wang
> Priority: Minor
> Attachments: HIVE-14112.1.patch
>
>
> Two tables, {{hbasetable_risk_control_defense_idx_uid}} is HBase mapped table:
> {noformat}
> [root@dev01 ~]# hadoop fs -du -s -h
> /hbase/data/tandem/hbase-table-risk-control-defense-idx-uid
> 3.0 G 9.0 G /hbase/data/tandem/hbase-table-risk-control-defense-idx-uid
> [root@dev01 ~]# hadoop fs -du -s -h /user/hive/warehouse/openapi_invoke_base
> 6.6 G 19.7 G /user/hive/warehouse/openapi_invoke_base
> {noformat}
> The smallest table is 3.0G, is greater than
> _hive.mapjoin.smalltable.filesize_ and
> _hive.auto.convert.join.noconditionaltask.size_. When join these tables, Hive
> auto convert it to mapjoin:
> {noformat}
> hive> select count(*) from hbasetable_risk_control_defense_idx_uid t1 join
> openapi_invoke_base t2 on (t1.key=t2.merchantid);
> Query ID = root_20160628092222_9f9d3f25-857b-412c-8a75-3d9228bd5ee5
> Total jobs = 1
> Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=512M;
> support was removed in 8.0
> Execution log at:
> /tmp/root/root_20160628092222_9f9d3f25-857b-412c-8a75-3d9228bd5ee5.log
> 2016-06-28 09:22:10 Starting to launch local task to process map join;
> maximum memory = 1908932608
> {noformat}
> the root cause is hive use
> {{/user/hive/warehouse/hbasetable_risk_control_defense_idx_uid}} as it
> location, but it empty. so hive auto convert it to mapjoin.
> My opinion is set right location when mapping HBase table.
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