HIVE-4679 WebHCat can deadlock Hadoop if the number of concurrently running tasks if higher or equal than the number of mappers (ekoifman via gates)


git-svn-id: https://svn.apache.org/repos/asf/hive/trunk@1494383 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/trunk' into trunk-gd
Merge remote branch 'origin/trunk-gd' into fb-ANT-REFACTORED-plus-GEN-TESTS-SPLIT-RELATIVE-trunk-gd