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From "Sushanth Sowmyan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13670) Improve Beeline reconnect semantics
Date Thu, 05 May 2016 07:48:13 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13670?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sushanth Sowmyan updated HIVE-13670:
------------------------------------
    Attachment: HIVE-13670.2.patch

Updated patch with a bunch of new semantics.

Firstly, !reconnect works to re-open !close-ed connections within the same session, as with
the previous patch.

Secondly, !reconnect now works across beeline instances if we do a !save after the connect.
(Basically, we save the lastConnectedUrl in a special variable, and use that to reconnect).

Next, we introduce the notion of named "saved" variables, so that a user can do something
like :

{noformat}
!set blue jdbc:hive2://localhost:10000/default/
!connect blue
{noformat}

In addition, these named variables are also saved and a "!connect blue" will work in the next
session along if a !save is done after the variable is !set.

Finally, a couple of commandline parameters have been added, so that "-u" now takes a named
variable, in addition to accepting only urls (if it determines that the -u parameter is not
a url, it will try to resolve it as a named saved variable to read.) Thus, "-u blue" would
then be the equivalent of "-u jdbc:hive2://localhost:10000/default/" which makes beeline a
bit more friendly to use. Lastly, a "-r" parameter has been added, which is the equivalent
of "-u lastConnectedUrl", which works as might be expected from semantics mentioned above.

Thanks to [~sladymon] for syntax suggestions and usability input, my original stab was much
more programmatic/config-based and would probably have been a bit more clunky.

> Improve Beeline reconnect semantics
> -----------------------------------
>
>                 Key: HIVE-13670
>                 URL: https://issues.apache.org/jira/browse/HIVE-13670
>             Project: Hive
>          Issue Type: Improvement
>    Affects Versions: 2.1.0
>            Reporter: Sushanth Sowmyan
>            Assignee: Sushanth Sowmyan
>         Attachments: HIVE-13670.2.patch, HIVE-13670.patch
>
>
> For most users of beeline, chances are that they will be using it with a single HS2 instance
most of the time. In this scenario, having them type out a jdbc uri for HS2 every single time
to !connect can get tiresome. Thus, we should improve semantics so that if a user does a successful
!connect, then we must store the last-connected-to-url, so that if they do a !close, and then
a !reconnect, then !reconnect should attempt to connect to the last successfully used url.
> Also, if they then do a !save, then that last-successfully-used url must be saved, so
that in subsequent sessions, they can simply do !reconnect rather than specifying a url for
!connect.



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