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The "Hive/Locking" page has been changed by NamitJain. http://wiki.apache.org/hadoop/Hive/Locking?action=diff&rev1=12&rev2=13 -------------------------------------------------- In order to avoid deadlocks, a very simple scheme is proposed here. All the objects to be locked are sorted lexicographically, and the required mode lock is acquired. Note that in some cases, the list of objects may not be known - for eg. in case of dynamic partitions, the list of partitions - being modified is not known at compile time - so, the list is generated conservatively. + being modified is not known at compile time - so, the list is generated conservatively. Since the + number of partitions may not be known, an exclusive lock is taken on the table, or the prefix that + is known. Two new configurable parameters will be added to decide the number of retries for the lock and the wait time between each retry. If the number of retries are really high, it can lead to a live lock.
