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Posted to issues@ignite.apache.org by "Aleksandr Polovtsev (Jira)" <ji...@apache.org> on 2026/03/19 10:45:00 UTC
[jira] [Updated] (IGNITE-28301) UOS: do not send unneeded class descriptors for Externalizable classes
[ https://issues.apache.org/jira/browse/IGNITE-28301?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksandr Polovtsev updated IGNITE-28301:
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Summary: UOS: do not send unneeded class descriptors for Externalizable classes (was: UOS: do not sent unneeded class descriptors for Externalizable classes)
> 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. Any node that cannot resolve {{Address}} fails to register the {{Member}} descriptor, which causes an {{IllegalStateException}} during deserialization.
>
> 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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