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The "Hive/Locking" page has been changed by NamitJain. http://wiki.apache.org/hadoop/Hive/Locking?action=diff&rev1=9&rev2=10 -------------------------------------------------- ||'''alter table T1 add cols'''||'''X on T1'''|| ||'''alter table T1 replace cols'''||'''X on T1'''|| ||'''alter table T1 change cols'''||'''X on T1'''|| - - + ||'''alter table T1 add partition P1'''||'''S on T1, X on T1.P1'''|| + ||'''alter table T1 drop partition P1'''||'''S on T1, X on T1.P1'''|| + ||'''alter table T1 touch partition P1'''||'''S on T1, X on T1.P1'''|| + ||'''alter table T1 set serdeProperties '''||'''S on T1'''|| + ||'''alter table T1 set serializer '''||'''S on T1'''|| + ||'''alter table T1 set file format '''||'''S on T1'''|| + ||'''alter table T1 set tblproperties '''||'''X on T1'''|| + ||'''drop table T1'''||'''X on T1'''|| 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
