[HIVE-2929] race condition in DAG execute tasks for hive

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.10.0
• Assignee: Namit Jain
• Reporter: Namit Jain
• Created: 06/Apr/12 06:10
• Updated: 10/Jan/13 19:54
• Resolved: 06/Apr/12 23:49

Description

select ...
(
SubQuery involving MapReduce
union all
SubQuery involving MapReduce
);

or

select ...
(SubQuery involving MapReduce)
join
(SubQuery involving MapReduce)
;

If both the subQueries finish at nearly the same time, there is a race
condition in which the results of the subQuery finishing last will be completely missed.