(The background of the QoS-aware replica placement problem is introduced, the abstract model of the system and the definition of the problem are synthesized, and several better algorithms at that time are introduced one by one. Through the self-designed and implemented replica placement simulator, the existing algorithms are analyzed qualitatively and quantitatively, the advantages and disadvantages of the algorithms are discussed, and the problems that need to be paid attention to in further research are pointed out.)
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