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HashTable과 ConcurrentHashMap 차이
둘다 thread safe
HashTable - 블락킹하여 동작하여 성능 감소
ConcurrentHashMap - 멀티 쓰레드로 블락킹없이 동작
각 쓰레드에서 map의 최신 데이터 표시가 필요하고, 데이터 일관성 보증이 필요하다면 HashTable
성능이 민감하고 각 쓰레드는 map에 쓰기만하고 읽기가 자주 발생하지 않는다면 ConcurrentHashMap
http://stackoverflow.com/a/510654/723405
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