ctas should check the table do not exists just right before move the data to
the table's directory
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Key: HIVE-2679
URL: https://issues.apache.org/jira/browse/HIVE-2679
Project: Hive
Issue Type: Bug
Reporter: binlijin
Fix For: 0.9.0
Some one first runs a ctas sql and the MR job takes a long time, another one
runs another ctas sql and the MR job takes a short time and finishs before the
first one. when the two ctas sql's tablename are the same, the first one will
move data to the table's directory success but the create table task will fail.
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