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From "Namit Jain (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-2929) race condition in DAG execute tasks for hive
Date Fri, 06 Apr 2012 06:10:33 GMT
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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