Xi Lyu created SPARK-55931:
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             Summary: Add errorClassFallback for monitoring/observability when 
the error length exceeds the maximum
                 Key: SPARK-55931
                 URL: https://issues.apache.org/jira/browse/SPARK-55931
             Project: Spark
          Issue Type: Improvement
          Components: Connect
    Affects Versions: 4.1.1
            Reporter: Xi Lyu


When messageParameters JSON exceeds the maxMetadataSize limit, we should 
surface the error class via a separate errorClassFallback metadata key to allow 
interceptor/proxy inspection without interfering with the FetchErrorDetails 
client/server flow.



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