slim bouguerra created HIVE-19490:
-------------------------------------
Summary: Locking on Insert into for non native and managed tables.
Key: HIVE-19490
URL: https://issues.apache.org/jira/browse/HIVE-19490
Project: Hive
Issue Type: Improvement
Components: Druid integration
Reporter: slim bouguerra
Current state of the art:
Managed non native table like Druid Tables, will need to get a Lock on Insert
into or insert Over write. The nature of this lock is set to Exclusive by
default for any non native table.
This implies that Inserts into Druid table will Lock any read query as well
during the execution of the insert into. IMO this lock (on insert into) is not
needed since the insert statement is appending data and the state of loading it
is managed partially by Hive Storage handler hook and part of it by Druid.
What i am proposing is to relax the lock level to shared for all non native
tables on insert into operations and keep it as Exclusive Write for insert
Overwrite for now.
Any feedback is welcome.
cc [~ekoifman] / [~ashutoshc] / [~jdere] / [~hagleitn]
Also am not sure what is the best way to unit test this currently am using
debugger to check of locks are what i except, please let me know if there is a
better way to do this.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
