FIX: getElement logic in BTreeStoreAndGetFuture. #662
Merged
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Motivation
기존 BTreeStoreAndGetFuture의 getElement 동작은
곧바로 element 변수를 리턴하는 로직인데
이는 Future의 get()이 완료되지 않을 경우
리턴되는 결과가 부정확하다.
즉, 응용의 Worker Thread가 Blocking되어 정확한 결과값을 리턴받도록 변경해야한다.
getElement() 내부적으로 get()을 호출하여
정확한 element를 리턴하도록 변경한다.