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From Yogi Devendra <yogideven...@apache.org>
Subject Re: APEXMALHAR-2382 User needs to create dt_meta table while using JdbcPOJOInsertOutputOperator
Date Sat, 14 Jan 2017 04:57:50 GMT
As Aniruddha pointed out, table creation should be done by dbadmin.
In that case, utility script will be helpful.

If we embed this code inside operator or application; then it will be
difficult for dbadmin to use it.

~ Yogi

On 14 January 2017 at 03:43, Thomas Weise <thw@apache.org> wrote:

> -1 for automatic schema modification, unless the user asked for it. See
> comment on JIRA.
>
>
> On Fri, Jan 13, 2017 at 5:11 AM, Aniruddha Thombare <
> aniruddha@datatorrent.com> wrote:
>
> > The tables should be created / altered by dbadmin.
> > We shouldn't worry about table creations as its one-time activity.
> >
> >
> >
> > Thanks,
> >
> > A
> >
> >
> > _____________________________________
> > Sent with difficulty, I mean handheld ;)
> >
> > On 13 Jan 2017 6:37 pm, "Yogi Devendra" <yogidevendra@apache.org> wrote:
> >
> > I am not very keen on having utility script.
> > But, "no side-effects without explicit ask by the end-user" is important.
> >
> > ~ Yogi
> >
> > On 13 January 2017 at 16:44, Priyanka Gugale <priyag@apache.org> wrote:
> >
> > > IMO it's okay to create table in java code. We should document it in
> > > operator guide as well as put a log message when we create table.
> > > And in case you don't have privileges, the operator should throw
> > meaningful
> > > message.
> > >
> > > -Priyanka
> > >
> > > On Fri, Jan 13, 2017 at 4:07 PM, Yogi Devendra <
> yogidevendra@apache.org>
> > > wrote:
> > >
> > > > My suggestions:
> > > >
> > > >    1. Have a separate utility script for creating this table.
> > > >    2. Have README for the utility script
> > > >    3. Mention about the utility script in the operator javadocs.
> > > >    4. Mention  about the utility script in the application README.
> > > >    5. If at all, you wish to ease out the process; you can introduce
> > flag
> > > >    like autoPopulateMetaTable. But. default value of this flag should
> > to
> > > be
> > > >    off.
> > > >    6. I would prefer to avoid side-effects unless explicitly asked by
> > the
> > > >    end user.
> > > >    7. Relevant exceptions should be caught and should have a message
> > > which
> > > >    can be understood by the end user.
> > > >
> > > > ~ Yogi
> > > >
> > > > On 13 January 2017 at 15:57, Hitesh Kapoor <hitesh@datatorrent.com>
> > > wrote:
> > > >
> > > > > Hi All,
> > > > >
> > > > > Currently to use JdbcPOJOInsertOutputOperator, user needs to create
> > > > > "dt_meta" table to enforce
> > > > > exactly-once processing semantic. If the user fails to create this
> > > table
> > > > > before launching the application an exception is thrown.
> > > > > To handle this scenario we can automate the process of creating
> this
> > > > table,
> > > > > assuming the user has the appropriate privileges. The problem with
> > this
> > > > > approach is that it may not be a very good idea to modify user's
> > > database
> > > > > automatically , also if the user doesn't has the appropriate
> > privileges
> > > > it
> > > > > will eventually throw an exception (however a different exception).
> > > > > So I need your opinion if we should automate the creation of this
> > > > internal
> > > > > table (if it doesn't exists) or continue with the existing
> behaviour
> > or
> > > > > anything else.
> > > > >
> > > > > Regards,
> > > > > Hitesh
> > > > >
> > > >
> > >
> >
>

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