XianReallyHot-ZZH commented on PR #13762:
URL: https://github.com/apache/ignite/pull/13762#issuecomment-6468893075

   The wire-format change is rolling-upgrade gated: the new `statusCode` field 
is declared with `@Order(value = 3, introducedBy = 
"QUERY_FAIL_RESPONSE_ERROR_CODE_FEATURE")` and registered in 
`CoreFeatureRegistry`, so the generated serializer writes/reads it only when 
both peers advertise the feature. With older peers the message stays 
byte-identical to today's (`statusCode` remains `NO_STATUS_CODE` and the 
reducer keeps the old causeless `CacheException` behavior).


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