Up until Hive 0.13 locks in Hive were really advisory only, since as you
note any user can remove any other user's lock. In Hive 0.13 a new type
of locking was introduced, see
https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions#HiveTransactions-LockManager
This new locking is automatic and ignores both LOCK and UNLOCK
commands. Note that it is off by default, you have to configure Hive to
use the new DbTxnManager to get turn on this locking. In 0.13 it still
has the bug you describe as far as acquiring the wrong lock for dynamic
partitioning, but I believe I've fixed that in 0.14.
Alan.
Shushant Arora <mailto:shushantaror...@gmail.com>
September 20, 2014 at 5:39
Hive version 0.9 and later has a bug
While inserting in a hive table Hive takes an exclusive lock. But if
table is partitioned , and insert is in dynamic partition , it will
take shared lock on table but if all partitions are static then hive
takes exclusive lock on partitions in which data is being inserted
and shared lock on table.
https://issues.apache.org/jira/browse/HIVE-3509
1.What if I want to take exclusive lock on table while inserting in
dynamic partition ?
I tried to take explicit lock using :
LOCK TABLE tablename EXCLUSIVE;
But it made table to be disabled.
I cannot even read from table anymore even is same session until I do
unlock table tablename in another session;
2. moreover whats lock level in hive , I mean any user can remove any
other users lock. that too seems buggy.
Thanks
Shushant
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