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From "Vikram Dixit K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-9223) HiveServer2 on Tez doesn't support concurrent queries within one session
Date Fri, 02 Jan 2015 20:03:35 GMT

    [ https://issues.apache.org/jira/browse/HIVE-9223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263199#comment-14263199
] 

Vikram Dixit K commented on HIVE-9223:
--------------------------------------

[~pala] can you let us know what is the scenario here? Do you mean to say that you have a
single hs2 session that multiple queries are concurrently being fired to? How are you doing
that? Does this work in mapreduce? Any light on this matter would be useful for identifying
the issue.

> 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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