Mikhail Petrov created IGNITE-29079:
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Summary: Support relaying unknown message fields when resending
messages
Key: IGNITE-29079
URL: https://issues.apache.org/jira/browse/IGNITE-29079
Project: Ignite
Issue Type: Task
Reporter: Mikhail Petrov
Assignee: Mikhail Petrov
The direct message format is positional. The serializer writes fields in @Order
sequence without storing per-field names or lengths. IGNITE-28851 made a pair
of mixed-version nodes agree on the same list of fields. All fields must be
known to the receiver, which must also be able to deserialize them.
This rule has a consequence for the Discovery ring: a field introduced in
version V is lost when a message travels through a V → V-1 → V path. In a ring,
this can occur on a path such as new → old → ... → old → new.
We need to support relaying a field introduced under feature F across the
entire new → old → ... → old → new path, even when the intermediate old nodes
do not have feature F and cannot deserialize the field value.
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