International Business Machines Corporation

Harley Andrew Stenzel

Srinivasan Muralidharan

Grant Mericle

Paul D Smith

Craig Andrew Lanzen

Andrew Dwight Dingsor

Managing domain name system services for a plurality of networks is disclosed. A computer identifies information for the plurality of networks to which a client device is connected. The computer receives a request to identify a domain name. In response to the request, the computer selects a particular set of domain name system servers of a particular network in the plurality of networks based on the information for the plurality of networks and a set of rules for selecting the particular set of domain name system servers when identifying the domain name for the Internet protocol address. The computer then sends the request to identify the domain name for the Internet protocol address to a domain name system server in the particular set of domain name system servers.

Selecting between domain name system servers of a plurality of networks

In managing communications for a group of servers, each server in the group of servers receives a request from one or more processor units for connection information for generating a set of mappings for a load balancer of the group of servers to replace another set of mappings for another load balancer of the group of servers. A sub-group of servers, in the group of servers, is created comprising servers that have not yet responded to the request for connection information. Responsive to a determination that a route to the server in the group of servers for a communication received from a client device cannot be identified from the set of mappings for the load balancer while the sub-group of servers includes one or more servers that have not yet responded to the request for connection information, the sub-group of servers receives the communication from the one or more processors.

Managing connection failover in a load balancer

A method and computer for managing domain name system services for a plurality of networks is disclosed. A computer identifies information for the plurality of networks to which a client device is connected. The computer receives a request to identify an internet protocol address for a domain name or vice-versa. In response to the request, the computer selects a particular set of domain name system servers of a particular network in the plurality of networks based on the information for the plurality of networks and a set of rules for selecting the particular set of domain name system servers when identifying the internet protocol address for the domain name. The computer then sends the request to identify the internet protocol address for the domain name to a domain name system server in the particular set of domain name system servers.

A method for managing communications for a group of servers is disclosed. A processor sends requests to the group of servers for connection information for generating a set of mappings for a load balancer of the group of servers to replace another set of mappings for another load balancer of the group of servers. Responsive to receiving a communication from a client device for the group of servers, the processor determines whether a route to a server in the group of servers can be identified from the set of mappings for the load balancer. If the route cannot be identified from the set of mappings for the load balancer, the processor forwards the communication to a sub-group of the group of servers that have not yet responded to the requests for connection information for generating the set of mapping so that only the one correct server responds.

A complex user-facing computer application often has run-time dependencies on other computer applications. The other computer applications may, in turn, have run-time dependencies on still other applications. A supporting application might run on multiple hosts and a particular host might be chosen by a higher-level application in order to meet requirements such load balancing or reliability. In order to facilitate intelligent choices by higher-level applications in the system, each server in the system is responsible for generating a performance capability or health score that reflects the health of local components and the health of all servers on which the given server has a direct run-time dependency. A particular server's generated health score is advertised to any other server that has a direct run-time dependency on the particular server. Decisions about which of alternative lower-level servers to use in a servicing a client request are made using a routing or hop-at-a-time approach.

Computer application performance optimization system

A method, system, and computer program product for improving the performance, reliability, and recoverability of a computer running a multi-threaded server application. The described techniques enable synchronization requirements to be minimized. A policy is enforced which limits the number of worker threads currently assigned to processing connections to a particular host. Thus if a host fails, some number of worker threads continue to actively service connections to other hosts. The policy may use static or dynamic limits. A single limit may pertain to all hosts, or host-specific limits may be used.

Growing community of inventors

Hillsborough, NC, United States of America

Harley Andrew Stenzel