Importance

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Abstract

A client connected to a multi-server system, (e.g., a parallel database management system) can locate a server product that may have moved to a different network address within the multi-server system. For example, a client is able to perform two-phase commit and automatic resynchronization with a same DBMS server that may have moved to a new network address before a transaction was committed. A unique resync port number is assigned to each server member when the server member is started up. The server's physical IP address and resync number are stored in a list in a global area accessible by each server member. When a client establishes a connection to a server member, the client will receive the server member's resync number or the global list. The client records the server's unique resync number in the client's dataset. If the client experiences a communication failure with that server, the client will send a message to a Domain Name Server requesting an IP address of any active server in the network. Upon receipt of an address, the client will send a connect message to that address. Upon receipt of the connection request message, that server can either send to the client a copy of the global list as part of the initial handshaking or scan the list and send to the client the IP address corresponding to the resync number of the desired server member. The client performs a resynchronization process via the IP address associated with that resync port number.

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First Claim