Pala M Muthaia created HIVE-9223:
------------------------------------
Summary: HiveServer2 on Tez doesn't support concurrent queries
Key: HIVE-9223
URL: https://issues.apache.org/jira/browse/HIVE-9223
Project: Hive
Issue Type: Bug
Components: HiveServer2
Reporter: Pala M Muthaia
When a user submits multiple queries in the same HS2 session (using thrift
interface) concurrently, the query goes through the same TezSessionState and
ends up being submitted to the same Tez AM, and the second query fails with the
error "App master already running a DAG"
Is this by design? I looked into the code, and the comments as well as the code
suggest support only for serial execution of queries within the same
HiveServer2 session (on tez).
This works for CLI environment but in a server, it is plausible that client
sends multiple concurrent queries under the same session (e.g: a web app that
executes queries for user, such as Cloudera Hue). So shouldn't HS2 on Tez
implementation support concurrent queries?
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
