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From "Pala M Muthaia (JIRA)" <>
Subject [jira] [Commented] (HIVE-9223) HiveServer2 on Tez doesn't support concurrent queries
Date Tue, 30 Dec 2014 00:38:14 GMT


Pala M Muthaia commented on HIVE-9223:

[~hagleitn] & [~vikram.dixit], could you comment? I am trying to get the big picture to
determine what the right fix should be. Thanks.

> HiveServer2 on Tez doesn't support concurrent queries 
> ------------------------------------------------------
>                 Key: HIVE-9223
>                 URL:
>             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?

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