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From "Pala M Muthaia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-9223) HiveServer2 on Tez doesn't support concurrent queries
Date Tue, 30 Dec 2014 00:36:13 GMT
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?



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