Yuming Wang created HIVE-14112:
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Summary: 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
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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