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https://issues.apache.org/jira/browse/IGNITE-15944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17479291#comment-17479291
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Roman Puchkovskiy commented on IGNITE-15944:
--------------------------------------------

Yet another problem is that the spec does not mention object IDs at all, but, 
as we are writing an object graph which structure is not restricted to be a 
tree and, hence, it may have some objects referenced multiple types, we need to 
write an object ID for each nullable value (that is, for everything that is not 
a primitive and not null).

> [Networking] User object serialization
> --------------------------------------
>
>                 Key: IGNITE-15944
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15944
>             Project: Ignite
>          Issue Type: Epic
>            Reporter: Semyon Danilov
>            Priority: Major
>              Labels: iep-67, ignite-3
>             Fix For: 3.0.0-alpha5
>
>
> Arbitrary objects serialization must be provided by Apache Ignite. Unlike 
> {{NetworkMessage}} descendants, user objects are not known to the system in 
> advance, and serialization layout must be resolved at runtime.
> For more information look at the 
> https://github.com/gridgain/gridgain-9-ce/blob/iep-67/modules/network/README.md



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