[jira] [Created] (HIVE-19821) Distributed HiveServer2

["Sahil Takiar (JIRA)" <ji...@apache.org>]

Sahil Takiar created HIVE-19821:
-----------------------------------

             Summary: Distributed HiveServer2
                 Key: HIVE-19821
                 URL: https://issues.apache.org/jira/browse/HIVE-19821
             Project: Hive
          Issue Type: New Feature
          Components: HiveServer2
            Reporter: Sahil Takiar
            Assignee: Sahil Takiar


HS2 deployments often hit OOM issues due to a number of factors: (1) too many concurrent connections, (2) query that scan a large number of partitions have to pull a lot of metadata into memory (e.g. a query reading thousands of partitions requires loading thousands of partitions into memory), (3) very large queries can take up a lot of heap space, especially during query parsing. There are a number of other factors that cause HiveServer2 to run out of memory, these are just some of the more commons ones.

Distributed HS2 proposes to do all query parsing, compilation, planning, and execution coordination inside a dedicated container. This should significantly decrease memory pressure on HS2 and allow HS2 to scale to a larger number of concurrent users.

For HoS (and I think Hive-on-Tez) this just requires moving all query compilation, planning, etc. inside the application master for the corresponding Hive session.

The main benefit here is isolation. A poorly written Hive query cannot bring down an entire HiveServer2 instance and force all other queries to fail.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)