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From "Bennie Schut (JIRA)" <>
Subject [jira] Updated: (HIVE-1815) The class HiveResultSet should implement batch fetching.
Date Wed, 16 Mar 2011 08:23:29 GMT


Bennie Schut updated HIVE-1815:

        Fix Version/s: 0.8.0
    Affects Version/s:     (was: 0.5.0)
         Release Note: Use batch fetching on the hive jdbc driver to increase performance.
               Status: Patch Available  (was: Reopened)

> The class HiveResultSet should implement batch fetching.
> --------------------------------------------------------
>                 Key: HIVE-1815
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: JDBC
>    Affects Versions: 0.8.0
>         Environment: Custom Java application using the Hive JDBC driver to connect to
a Hive server, execute a Hive query and process the results.
>            Reporter: Guy le Mar
>             Fix For: 0.8.0
>         Attachments: HIVE-1815.1.patch.txt
> When using the Hive JDBC driver, you can execute a Hive query and obtain a HiveResultSet
instance that contains the results of the query.
> Unfortunately, HiveResultSet can then only fetch a single row of these results from the
Hive server at a time. As a consequence, it's extremely slow to fetch a resultset of anything
other than a trivial size.
> It would be nice for the HiveResultSet to be able to fetch N rows from the server at
a time, so that performance is suitable to support applications that provide human interaction.

> (From memory, I think it took me around 20 minutes to fetch 4000 rows.)

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