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https://issues.apache.org/jira/browse/IGNITE-28301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Roman Puchkovskiy updated IGNITE-28301:
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Epic Link: IGNITE-15944
> UOS: do not send unneeded class descriptors for Externalizable classes
> ----------------------------------------------------------------------
>
> Key: IGNITE-28301
> URL: https://issues.apache.org/jira/browse/IGNITE-28301
> Project: Ignite
> Issue Type: Improvement
> Reporter: Aleksandr Polovtsev
> Priority: Major
> Labels: ignite-3
>
> h2. Summary
>
>
>
>
>
> UOS (User Object Serialization) incorrectly sends class descriptors for all
> declared field types of {{Externalizable}} classes, even though the
> {{Externalizable}} contract explicitly delegates serialization to
> {{writeExternal()}}/{{readExternal()}}. Field types are irrelevant to the
> wire format — only what the implementation explicitly writes matters.
>
>
>
>
> h2. Problem
>
>
> When UOS encounters an {{Externalizable}} class, it collects and sends
> descriptors for all its field types, even if those fields are never written
> to the stream via {{writeExternal()}}. This is incorrect because:
>
>
>
> * {{Externalizable}} classes are fully responsible for their own
> serialization format
>
> * Field type descriptors add unnecessary overhead to the wire protocol
> * Sending descriptors for field types that are not part of the serialized
> form creates a hard dependency on those types being present on the receiving
> node, even if they are never actually transmitted
>
>
>
> h2. Example
>
>
>
>
>
> {{io.scalecube.cluster.Member}} implements {{Externalizable}}. Its
> {{writeExternal()}} writes the address as a plain UTF string — not as a Java
> object. However, UOS sends a descriptor for the field's declared type
> ({{io.scalecube.net.Address}}) anyway.
>
>
>
>
>
> h2. Expected Behavior
> UOS should not send class descriptors for field types of {{Externalizable}}
> classes. Descriptor collection for such classes should be limited to types
> that are explicitly written as objects in {{writeExternal()}}, not inferred
> from field declarations.
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