Multicasting method in distributed cache environment, and distributed cache server using the same

A specific distributed cache server for performing multicast in a distributed cache environment, comprising:

• a communication part for transmitting certain messages to client nodes including at least one another distributed cache server among the plurality of distributed cache servers in the distributed cache environment through the multicast;
• and
• a processor for performing processes of (I) sequentially registering, in an unacknowledged message map, UNACK messages representing messages without their corresponding ACK messages from their corresponding client nodes among the certain messages;
• and (II) checking the number of the UNACK messages registered in the unacknowledged message map and, if the number reaches a first predetermined number, stopping transmission of additional messages to the client nodes through the multicast.

A specific distributed cache server for performing a multicast method in a distributed cache environment, comprising:

• a communication part for obtaining certain messages transmitted from client nodes including at least one another distributed cache server among the plurality of distributed cache servers in the distributed cache environment through the multicast;
• and
• a processor for performing processes of (I) sequentially registering ACK messages for transmitting a confirmation as to a reception of the certain messages to the client nodes in their corresponding ACK message queues and managing the registered ACK messages;
• and (II) (i) identifying each of specific ACK messages having each largest message number for each of the client nodes among ACK messages registered in each of the ACK message queues and (ii) transmitting each of the identified specific ACK messages to each of the corresponding client nodes and automatically determining that at least part of ACK messages, in each of the ACK message queues corresponding to each of the client nodes, having a message number smaller than each message number of each of the specific ACK messages have been confirmed.