JPH03202935A - Synchronization update system in distributed processing system - Google Patents

Abstract

PURPOSE:To shorten a response time for an update subject by asynchronously updating information for a node except for the node by means of information stored in a temporary storage means. CONSTITUTION:When the update subject 21 which belongs to a center A22 gives the update request of a data file 23 in the center A22, the center A22 updates the data file 23 by an update request content and stores an update data content in an update information storage file 24. Then, a response is immediately returned to the update subject 21. When the update content of the data file 23 is stored in the update information storage file 24, the center A 22 reads the update request content from the update information storage file 24, transmits it and a center B 25 updates a data file 26 by the received update request content. In such a case, the processing of the update subject completes when the update of data in the center where the update mainbody exists completes. Thus, the processing waiting time of the update subject can be shortened.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a synchronous update method in a distributed processing system in which when information in one location is updated, information in other locations must also be updated, and in particular, The present invention relates to a synchronous update method in a distributed processing system suitable for shortening response time to.

[Prior Art] Conventionally, in transportation seat reservations, bank counter operations, etc., operations have been streamlined and services improved by using databases that are geographically or functionally distributed.

In such a distributed processing system, since many users use the database at the same time, it is necessary to update shared data synchronously. Therefore, when data at one center (or node) is updated, data at other centers is also updated synchronously. In this case, a response is returned to the updater such as a terminal belonging to that center after the information update of all centers is completed.

The conventional database access request processing method is described in, for example, Japanese Patent Laid-Open No. 138439/1983.

[Problem to be solved by the invention]

In the above-mentioned conventional technology, when a synchronous update is performed, a response to the update subject is not returned until all information existing in a plurality of locations is updated, so there is a problem in that the response time to the update subject is long.

The purpose of the present invention is to improve these problems.

An object of the present invention is to provide a synchronous update method in a distributed processing system that can shorten the response time to an update subject.

[Means for Solving the Problems J] In order to achieve the above object, the synchronous update method in the distributed processing system of the present invention provides a distributed processing system that manages information by distributing it to a plurality of nodes.
Means to temporarily store update information (update information storage file)
When there is an information update request from a terminal (update subject) belonging to that node, that node updates its own information, stores the updated information in its temporary storage means, and returns a response to the terminal. , is characterized in that information updates to other nodes are performed asynchronously using information stored in the temporary storage means.

[Operation] In the present invention, when an update request is received from an update subject such as a terminal, the information of the distributed processing node to which the update subject belongs is updated, and a response is immediately returned to the update subject.
Temporarily store updated information.

Furthermore, the stored information is read out and the information of other distributed processing nodes is also updated.

This makes it possible to shorten the response time to the updater.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of a distributed processing system according to an embodiment of the present invention.

In FIG. 2, reference numeral 21 denotes an updater such as a terminal belonging to center A 22, and 22 denotes centers A and 23 that manage information in a distributed manner using a database management system (not shown), etc., and are connected to center B 25 by a communication line, etc. 2 is a data file of the center A 22, 24 is an update information storage file for temporarily storing update information of the data file 23, 25 is a data file of the center B, and 26 is a data file of the center B 25.

Further, each data file 23, 26 shares the same information, and when one of them is updated, the other is also updated.

Next, data update processing in this embodiment will be described.

FIG. 1 is a flowchart showing the processing performed by center A when receiving an update request in an embodiment of the present invention.

FIG. 3 is a flowchart showing the update information storage file read processing in one embodiment of the present invention, and FIG. 4 is a flowchart showing the data update processing at center B in one embodiment of the invention.

In this embodiment, when the update subject 21 belonging to the center A22 makes a request to update the data file 23 of the center A22, the center A22 updates the data file 23 according to the content of the update request 101, as shown in FIG. 102)
, Furthermore, the update contents are stored in the update information storage file 24 (103).

After that, a response is immediately returned to the update subject 21 (10
4) As the update request is completed, the update subject 21 can quickly move on to the next process.

Further, in step 103, when the updated contents of the data file 23 are stored in the updated information storage file 24,
As shown in FIG. 3, the center A 22 reads the update request content from the update information storage file 24 (301) and transmits it to the center B 25 (302).

As a result, the center B 25 updates the data file 26 according to the content of the received update request, as shown in FIG. 4 (401, 402).

[Effect of the invention J According to the present invention, when updating information existing in multiple nodes in a distributed processing system, the processing of the update subject is completed when the data update of the center where the update subject exists is completed. Therefore, it is possible to shorten the processing waiting time of the update subject.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing processing when center A receives an update request in an embodiment of the present invention, FIG. 2 is a configuration diagram of a distributed processing system in an embodiment of the present invention, and FIG. Flowchart showing update information storage file read processing in the embodiment. FIG. 4 is a flowchart showing data update processing at center B in one embodiment of the present invention. 21: Update subject such as terminal, 22: Center A, 23: Center A data file, 24: Update information storage file, 25: Center B, 26: Center B data file. to? )",'lI,l"

Claims (1)

[Claims] 1. In a distributed processing system in which information is distributed and managed among multiple nodes, the nodes are equipped with means for temporarily storing updated information, and when an information update request is received from a terminal belonging to the node, the node Updates the information of its own node, stores the updated information in the temporary storage means, returns a response to the terminal, and updates information for nodes other than the node asynchronously using the information stored in the temporary storage means. A synchronous update method in a distributed processing system characterized by the following.