Patents by Inventor Chandra M. Kintala

Chandra M. Kintala has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6470389
    Abstract: Methods and apparatus for hosting a network service on a cluster of servers, each including a primary and a secondary Internet Protocol (IP) address. A common cluster address is assigned as the secondary address to each of the servers in the cluster. The cluster address may be assigned in UNIX-based servers using an ifconfig alias option, and may be a ghost IP address that is not used as a primary address by any server in the cluster. Client requests directed to the cluster address are dispatched such that only one of the servers of the cluster responds to a given client request. The dispatching may use a routing-based technique, in which all client requests directed to the cluster address are routed to a dispatcher connected to the local network of the server cluster. The dispatcher then applies a hash function to the client IP address in order to select one of the servers to process the request.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: October 22, 2002
    Assignees: Lucent Technologies Inc., AT&T Corp.
    Inventors: Pi-Yu Chung, Om P. Damani, Yennun Huang, Chandra M. Kintala, Yi-Min Wang
  • Patent number: 5440726
    Abstract: A progressive retry recovery system based on checkpointing, message logging, rollback, message replaying and message reordering is disclosed. The disclosed progressive retry system minimizes the number of involved processes as well as the total rollback distance. The progressive retry recovery system includes a fault tolerant software library which provides a number of functions which may be invoked by application processes to implement fault tolerance. Fault tolerant functions are provided for allowing an application process to generate a heartbeat message at specified intervals indicating that the application process is still active. In addition, fault tolerance implementation functions are provided for specifying critical memory, for executing checkpoints to store backup copies of critical data, and for restoring critical data during a recovery. In addition, functions are provided which process messages that are sent or received by an application process and maintain logs of the sent and received messages.
    Type: Grant
    Filed: June 22, 1994
    Date of Patent: August 8, 1995
    Assignee: AT&T Corp.
    Inventors: Wesley K. Fuchs, Yennun Huang, Chandra M. Kintala, Yi-Min Wang