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From "Bill Graham (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-795) Return better error messaging from HiveServer
Date Tue, 25 Aug 2009 22:56:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747701#action_12747701
] 

Bill Graham commented on HIVE-795:
----------------------------------

I've got this implemented with better error messaging using the approach described above and
the message returned is now better. The {{Driver}} response codes are pretty coarse though
(10={{SemanticException}},11={{ParseException}},12={{Unknown}}), so I can't set a very good.ANSI
SQL-99 SQLState in {{SQLException}}. We have all this info known on the server though, so
we should tackle this as well.

I propose a few more modifications to support valid SQLStates on the client:

- Extend the {{org.apache.hadoop.hive.ql.parse.ErrorMsg}} {{enum}} to include a {{SQLState}}
field in addition to the current {{mesg}} string. We'd use the SQLStates defined in section
12.5 of http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt or possibly borrow some
the of the sql state extensions used by MySQL.

- Add a {{SQLState}} field to {{HiveServerException}} in addition to the {{errorCode}} field.

- When {{HiveServer}} builds the {{HiveServerException}}, it will look up the {{SQLCode}}
mapped to the exceptions message in the {{ErrorMsg}} enum.

Using {{ErrorMsg}} to couple the message to the sql state isn't the most elegant approach,
but it's the best way I can thing of transmitting this info without refactoring all the places
where new exceptions are thrown. Thoughts?

> Return better error messaging from HiveServer 
> ----------------------------------------------
>
>                 Key: HIVE-795
>                 URL: https://issues.apache.org/jira/browse/HIVE-795
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Server Infrastructure
>            Reporter: Bill Graham
>            Assignee: Bill Graham
>
> If an exception is thrown on the Hive server (i.e., when an invalid query is passed),
the Hive server throws a HiveServerExcpeption to the client with a message like "Query returned
non-zero code: 10". A more informative description of the cause of the error should be returned.

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