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https://issues.apache.org/jira/browse/HIVE-9423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15514219#comment-15514219
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Lefty Leverenz commented on HIVE-9423:
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+1 for the new error messages (patch 4)

> HiveServer2: Provide the user with different error messages depending on the 
> Thrift client exception code
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-9423
>                 URL: https://issues.apache.org/jira/browse/HIVE-9423
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>    Affects Versions: 0.12.0, 0.13.0, 0.14.0, 0.15.0
>            Reporter: Vaibhav Gumashta
>            Assignee: Peter Vary
>         Attachments: HIVE-9423.2.patch, HIVE-9423.3.patch, HIVE-9423.4.patch, 
> HIVE-9423.patch
>
>
> An example of where it is needed: it has been reported that when # of client 
> connections is greater than   {{hive.server2.thrift.max.worker.threads}}, 
> HiveServer2 stops accepting new connections and ends up having to be 
> restarted. This should be handled more gracefully by the server and the JDBC 
> driver, so that the end user gets aware of the problem and can take 
> appropriate steps (either close existing connections or bump of the config 
> value or use multiple server instances with dynamic service discovery 
> enabled). Similarly, we should also review the behaviour of background thread 
> pool to have a well defined behavior on the the pool getting exhausted. 
> Ideally implementing some form of general admission control will be a better 
> solution, so that we do not accept new work unless sufficient resources are 
> available and display graceful degradation under overload.



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