Add get_unique_id() call to metastore
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Key: HIVE-789
URL: https://issues.apache.org/jira/browse/HIVE-789
Project: Hadoop Hive
Issue Type: Improvement
Components: Metastore
Reporter: Todd Lipcon
Fix For: 0.4.0
As noted in HIVE-718, it can be tough to avoid race conditions when multiple
clients are trying to move files into the same directory. This patch adds a
get_unique_id() call to the metastore that returns the current value from an
incrementing JDO Sequence so that clients can avoid some races without locks.
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