> otherwise, why would we need specific transactional caches?

Transactional caches rollback the update in the event of failure; atomic caches 
do not.

> Regarding collocated computing:  We have to work in C++ and, since Ignite
> nodes use Java, I don't see how it is possible to send a C++ piece of code
> (like a lambda) so that it gets executed within the node... 

With C++ you’d need to deploy the code in advance.

You’re talking about peer-class loading, but that’s not a necessary part of 
colocated computing.

Regards,
Stephen

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