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From "Dejan Menges (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9223) HiveServer2 on Tez doesn't support concurrent queries within one session
Date Tue, 22 Sep 2015 12:52:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14902535#comment-14902535
] 

Dejan Menges commented on HIVE-9223:
------------------------------------

Hi,

Is there any progress on this one? Or at least some plans when this could be solved?

Thanks!

> HiveServer2 on Tez doesn't support concurrent queries within one session
> ------------------------------------------------------------------------
>
>                 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?



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