Github user yanghua commented on the issue: https://github.com/apache/flink/pull/5573 Hi @aljoscha and @tillrohrmann I have tried to put `Map<String, SerializedValue<Object>>` into `JobAccumulatorsInfo` with two ways : * a `@JsonProperty` * marked with `@JsonIgnore` and provide getter and setter and the two ways both failed with different reason: * first way : throw a exception : `SerializedValue` no suitable constructor; * second way : the setted object will be ignore by `HandlerUtils#sendResponse` In `JobAccumulatorsHandler#handleRequest` I can not return `Map<String, SerializedValue<Object>>` directly, because this method's result type must extends `ResponseBody`.
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