[HIVE-14112] Join a HBase mapped big table shouldn't convert to MapJoin

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 1.1.0, 1.2.0
• Component/s: StorageHandler
• Assignee: Yuming Wang
• Reporter: Yuming Wang
• Created: 28/Jun/16 02:01
• Updated: 28/Oct/22 00:18
• Resolved: 28/Oct/22 00:18

Description

Two tables, hbasetable_risk_control_defense_idx_uid is HBase mapped table:

[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

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:

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

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.