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From "Naveen Gangam (Jira)" <>
Subject [jira] [Updated] (HIVE-22853) Beeline should use HS2 server defaults for fetchSize
Date Mon, 24 Feb 2020 18:30:00 GMT


Naveen Gangam updated HIVE-22853:
    Status: Patch Available  (was: Open)

Patch with feedback from Yongzhi. 
The previous patch was not honoring the fetchSize set as part of the JDBC URL. This value
is now being passed to the server as part of the OpenSession. The server either returns the
value set in the session, or will return the server default value.
Prior to this fix, the client always sent its default value of 1000 if the value was not set
in the URL.

With the new patch, here is how the fetch size works.
* If there is no fetchSize in the JDBC URL, the client(beeline/JDBC client) uses the server-side
setting of fetch size that is sent back as part of the session establishment. Beeline can
change this value using "set" command. JDBC clients can set a different value at the statement
level using Statement.setFetchSize(). Beeline can use a different value within session, using
a "set hive.server2.thrift.resultset.default.fetch.size=..." command. 
* If there is a fetchSize in the JDBC URL, this will be used until it is changed/reset as
described in the comment above.
* In both cases, if the value for fetchSize, sent by the client, is higher than the hive.server2.thrift.resultset.max.fetch.size
on the server, the server automatically uses its max setting value and the client value will
be ignored.

> Beeline should use HS2 server defaults for fetchSize
> ----------------------------------------------------
>                 Key: HIVE-22853
>                 URL:
>             Project: Hive
>          Issue Type: Bug
>          Components: Beeline
>    Affects Versions: 4.0.0
>            Reporter: Naveen Gangam
>            Assignee: Naveen Gangam
>            Priority: Major
>         Attachments: HIVE-22853.2.patch, HIVE-22853.3.patch, HIVE-22853.patch
> Currently beeline uses a hard coded default of 1000 rows for fetchSize. This default
value is different from what the server has set. While the beeline user can reset the value
via set command, its cumbersome to change the workloads.
> Rather it should default to the server-side value and set should be used to override
within the session.

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