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From Pala M Muthaia <>
Subject Concurrent queries on HiveServer2 on tez fails
Date Sat, 20 Dec 2014 02:23:14 GMT
When a user submits multiple queries in the same HS2 session (using thrift
interface), the query goes through the same TezSessionState and ends up
being submitted to the same Tez AM, and then 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).

Our stack is Hue 3.5 - HiveServer2 (Hive 0.13.1) - Tez 0.4.1. We are using
job queues, and have turned on doAs flag for impersonation.

I am still familiarizing myself with the code, to determine possible fixes,
but wanted to get input from folks who have any context on this, in the


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