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From Igor Sapego <isap...@apache.org>
Subject Re: IEP-66: Thin Client Automatic Binary Configuration
Date Tue, 02 Feb 2021 16:23:35 GMT
Guys,

I agree with your concerns about backward compatibility, but
I think this can be a good feature that will help us to add support
for compact footer to thin clients that do not support it currently.

Best Regards,
Igor


On Tue, Feb 2, 2021 at 11:49 AM Pavel Tupitsyn <ptupitsyn@apache.org> wrote:

> Alex,
>
> This is a very good point, thank you for the heads up.
>
> The proposal does not include changing any existing behavior,
> we simply add an operation to the protocol, so there is
> no compatibility risk from the server-side changes alone.
>
> However, it looks like only .NET thin client can make use
> of the compactFooter flag, since it is true by default there,
> and changing from true to false is safe.
>
> Additionally, we can't use the nameMapper value even in .NET,
> since it changes the default behavior and potentially breaks
> compatibility on existing clusters. All we can do is log a warning.
>
> I've updated the proposal accordingly.
>
>
> On Tue, Feb 2, 2021 at 9:50 AM Alex Plehanov <plehanov.alex@gmail.com>
> wrote:
>
> > Hello Pavel,
> >
> > Changing the "compact footer" property for an existing database can lead
> to
> > compatibility issues. Some clients (at least java) have "false" as the
> > default value of the "compact footer" property, but the default value for
> > the server-side is "true". If thin client will receive binary
> configuration
> > from the server it will be unable to get values using user-defined type
> as
> > a key inserted by previous versions of the client (see [1]).
> > Also, AFAIK, some clients still don't have compact footer support.
> > So we should think carefully about how to provide compatibility using
> this
> > feature (for example, enable this feature only for clusters with no data
> > inserted into caches by previous versions of thin clients)
> >
> > [1]: https://issues.apache.org/jira/browse/IGNITE-10960
> >
> > пн, 1 февр. 2021 г. в 19:33, Pavel Tupitsyn <ptupitsyn@apache.org>:
> >
> > > Igniters,
> > >
> > > Please review the IEP [1] and let me know your thoughts.
> > >
> > > [1]
> > >
> > >
> >
> https://cwiki.apache.org/confluence/display/IGNITE/IEP-66%3A+Thin+Client+Automatic+Binary+Configuration
> > >
> >
>

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