[TAJO-896] Full outer join query with empty intermediate data doesn't terminate.

• Type: Bug
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Assignee: Hyoungjun Kim
• Reporter: Hyoungjun Kim
• Created: 30/Jun/14 07:26
• Updated: 13/Aug/14 08:39
• Resolved: 13/Aug/14 08:39

Description

See title.
I ran the following query. Left and right subquery's result is empty.

select a.l_orderkey 
from (select * from lineitem where l_orderkey < 0) a
full outer join (select * from lineitem where l_orderkey < 0) b
on a.l_orderkey = b.l_orderkey

The next log is QueryMaster's log. QueryMaster assigned 1 task for JOIN execution block.

2014-06-30 16:18:24,987 INFO: org.apache.tajo.master.querymaster.Repartitioner (scheduleFragmentsForJoinQuery(186)) - [Distributed Join Strategy] : Symmetric Repartition Join
2014-06-30 16:18:24,988 INFO: org.apache.tajo.master.querymaster.Repartitioner (scheduleFragmentsForJoinQuery(258)) - Larger intermediate data is approximately 0 MB
2014-06-30 16:18:24,988 INFO: org.apache.tajo.master.querymaster.Repartitioner (scheduleFragmentsForJoinQuery(261)) - The calculated number of tasks is 0
2014-06-30 16:18:24,988 INFO: org.apache.tajo.master.querymaster.Repartitioner (scheduleFragmentsForJoinQuery(262)) - The number of total shuffle keys is 1
2014-06-30 16:18:24,988 INFO: org.apache.tajo.master.querymaster.Repartitioner (scheduleFragmentsForJoinQuery(266)) - The determined number of join tasks is 0
2014-06-30 16:18:24,989 INFO: org.apache.tajo.master.querymaster.SubQuery (transition(647)) - 1 objects are scheduled
2014-06-30 16:18:24,989 INFO: org.apache.tajo.master.DefaultTaskScheduler (start(87)) - Start TaskScheduler
2014-06-30 16:18:24,990 INFO: org.apache.tajo.worker.TajoResourceAllocator (calculateNumRequestContainers(100)) - CalculateNumberRequestContainer - Number of Tasks=0, Number of Cluster Slots=1
2014-06-30 16:18:24,990 INFO: org.apache.tajo.master.querymaster.SubQuery (allocateContainers(888)) - Request Container for eb_1404112701831_0001_000003 containers=0
2014-06-30 16:18:24,990 INFO: org.apache.tajo.master.querymaster.Query (executeNextBlock(609)) - Scheduling SubQuery:eb_1404112701831_0001_000003
2014-06-30 16:18:24,991 INFO: org.apache.tajo.worker.TajoResourceAllocator (run(217)) - Start TajoWorkerAllocationThread
2014-06-30 16:18:26,480 INFO: org.apache.tajo.master.querymaster.QueryInProgress (heartbeat(265)) - Received QueryMaster heartbeat:q_1404112701831_0001,state=QUERY_RUNNING,progress=0.6666667, queryMaster=babokim-MacBook-Pro.local
2014-06-30 16:18:27,992 INFO: org.apache.tajo.worker.TajoResourceAllocator (run(261)) - No available worker resource for eb_1404112701831_0001_000003