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From Vladimir Ozerov <voze...@gridgain.com>
Subject Re: DML data streaming
Date Tue, 14 Feb 2017 14:16:59 GMT

This will not work for primitive keys and values as currently the only way
to address them is to use "_KEY" and "_VAL" aliases respectively. For this
reason I would rather postpone UPDATE/DELETE implementation until "_KEY"
and "_VAL" are hidden from public API and some kind of mapping is
introduced. AFAIK this should be handled as a part of IGNITE-3487 ]1].

[1] https://issues.apache.org/jira/browse/IGNITE-3487

On Sat, Feb 11, 2017 at 3:36 AM, Dmitriy Setrakyan <dsetrakyan@apache.org>

> On Fri, Feb 10, 2017 at 3:36 AM, Vladimir Ozerov <vozerov@gridgain.com>
> wrote:
> > I propose to ship streaming with INSERT support only for now. This is
> > enough for multitude cases and will add value to Ignite 1.9 immediately.
> We
> > can think about correct streaming UPDATE/DELETE architecture separately
> .It
> > is much more difficult thing, we cannot support it in a clean way right
> now
> > due to multiple "_key" and "_val" usages over the code base.
> >
> Vova, I disagree. If all parts of the key are present, then we can always
> construct a key in all cases. For these operations we can always support
> streaming. For all other operations, we can delegate to standard MR, but
> still perform most operations on the same node, as I suggested in another
> email.

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