race condition in DAG execute tasks for hive
--------------------------------------------
Key: HIVE-2929
URL: https://issues.apache.org/jira/browse/HIVE-2929
Project: Hive
Issue Type: Bug
Reporter: Namit Jain
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.
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