Hitachi, Ltd.

Naoki Haraguchi

Kunihiko Toumura

Masafumi Kinoshita

Naokazu Nemoto

Izumi Mizutani

Yoshiteru Takeshima

Yukiko Takeda

Takafumi Koike

Izumi Koyanagi

This server for distributing messages quickly detects a performance decline in a downstream server by using a method for keeping, for each distribution-destination server, a threshold such as a connection number and a time interval separate from a response timeout, and determining that performance has declined when the threshold is exceeded. In addition, the present invention improves system availability by identifying a server group in which performance has declined on the basis of a correlation pertaining to inter-server cooperative processing, when a distribution server exhibits a decline in performance, and by the distribution server distributing a message to a server not exhibiting a decline in performance.

Message system for avoiding processing-performance decline

A computer system for realizing increased speed of identifying extent of a failure in a messaging system, provided with: a first computer including a message receiving part, a first log output part, and a first memory part configured to store receiving log data; a second computer including a data store management part configured to manage a data store, a first search part configured to search a message that meets a given condition from among messages stored in the data store, a second log output part, and a second memory part configured to store data store log data; a third computer including a message sending part, a third log output part, and a third memory part configured to store sending log data; and a fourth computer including a monitoring part, a log collecting part, and a second search part configured to search for lost message.

Computer system and method of identifying a failure

There is provided a distributed processing system including: a data store server for storing data; a data store part for storing data in the data store server; a data acquisition part for obtaining data from the data store server; and an operation manager part for performing configuration change on the whole system. The distributed processing system has a function of managing the configuration content and the configuration order for each device according to the change content, to determine the target and order to be configured based on the managed information by the operation manager part. Further, the distributed processing system has a function of performing a configuration change process on the data store part, the data acquisition part, and the data store server by the operation manager part.

Distributed processing system

A gateway device disposed at front stage before a server has a dispersion rule of data dispersed on server side and analyzes communication data to specify a server to be accessed finally, so that identification information of the specified server is added to packet option of IP layer to thereby omit higher-rank routing processing than IP layer of gateway devices on the way. Consequently, transfer processing of a gateway device at back stage can be performed at high speed and access passing through a network route intended by manager is possible.

Access relay method and access gateway device

A load balancing system for performing stable processing and high reliability includes a management device which acquires time information indicating the time required in past processing on each of n processing devices, estimates a required time required for each processing devices to process processing target information based on the time information thereby obtaining an estimated time, and transmits estimated time information indicating a relationship between the estimated time and the processing device to a load balancing device. The load balancing device determines m (1&#x3c;m&#x3c;n) processing devices that process the processing target information based on the estimated time information and transmits the processing target information to the designated processing devices. A processing result determination device receives results from the processing devices, estimates a true value from the results to obtain an estimated value, and transmits the estimated value to a subsequent-stage processing device that processes the estimated value.

Processing control system, processing control method, and processing control program

A method in which a mail server for receiving mails manages sequence management information that records the sequence of mails stored in a data store server and the times at which a mail server sends the mails to a destination server, wherein the sequence management information is so managed as to satisfy the two conditions: one is to make not greater than a predetermined number the number of entries in any one of respective pieces of the divided sequence management information resulted by dividing the sequence management information into a plurality of pieces, each entry being included in each divided sequence management information piece and defined as a combination of key having the mail body of a certain mail as its value, and the time at which the certain mail is sent to the destination server.

Data storing method used for data store server in mailing system

In a system with a terminal sending a request, when a load distributing unit distributes the request to many service providing apparatuses, the load distributing unit becomes a bottleneck of performance and/or a single point of failure. When the load is distributed to the service providing apparatuses without using the load distributing unit, a particular function is required on the terminal side to appropriately select one of apparatuses. A name resolution unit including an address group management table with IP addresses to select, for a request from a terminal, an address from the table to return the address to the terminal and a plurality of service providing apparatuses to which at least zero IP address selected from the table is allocated without duplication are arranged such that each service providing apparatus is allocated with IP addresses according to processing performance thereof, thereby conducting appropriate load distribution.

Service providing system

In a system without a TCP termination process at normal times, and in the case where a URL within an HTTP access is extracted from reception packets, a passage/access refusal determination of the URL is performed, and a determination result is an access refusal, the TCP termination process is performed, a filtering device has the possibility that when an UTTP access as a disconnect case is frequently performed, it is erroneously recognized as a DoS attack on the side of the Web server device. A network system has a detection unit of frequent accesses to access control object data in the same Web server device from the same client device and a disconnect unit of a TCP connection to the Web server device after detection through the detection unit.

Growing community of inventors

Kawasaki, Japan

Naoki Haraguchi