JPH0448348A - Decentralized updating processing system - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the waiting and deadlock states without deteriorating the responsiveness to the users by providing a 1st processing part of a multi-task constitution which returns the answer message data to each input/output device and a 2nd processing part of a single task constitution which updates a master file based on the recorded data. CONSTITUTION:A 1st processing part 21 has a multi-task constitution and processes simultaneously the message data received form the input/output devices 11 - 1n. Then the part 21 stores temporarily the recorded data related to the updating of a master file 4 in a 1st external storage 31 and storage the storage information on the storage 31 in a 2nd external storage 32 to return the answer message data to the devices 11 - 1n. Meanwhile a 2nd processing part 22 has a single task constitution and works when the information is stored in the storage 32. Then the part 22 reads successively the recorded data stored in the storage 31 out of the information stored in the storage 32 for each processing and updates actually the data on the file 4. Thus it is possible to prevent the occurrence of the waiting and deadlock states without deteriorating the responsiveness to the users.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a distributed update processing method in an online system for electronic meters.

[Conventional technology]

In recent years, there has been a tendency for online systems to require increasingly sophisticated services due to the expansion of general business, and processing times are inevitably increasing due to the complexity of processing.
Improving responsiveness has become an important tJN.

For this reason, traditional online systems
For example, by adopting a multitasking configuration and simultaneously processing various high-frequency requests (message data) and returning the results (response message data), response times are shortened through parallel processing.

[Problem to be solved by the invention]

As mentioned above, conventional online systems aim to shorten response time through parallel processing, but
Another problem occurred due to exclusive control to prevent conflicts caused by simultaneous updates of the master file from multiple tasks. That is, (1) Concentration of input/output on data in the same block of the master file causes other tasks to wait, and the waiting time actually lengthens the response time, resulting in poor responsiveness.

When data in a master file is updated multiple times in a process based on message data 01, a deadlock occurs between multiple tasks as they mutually request data that is locked by the other party under exclusive control.
Processing cannot continue.

There were other drawbacks.

The present invention has been proposed in view of the above points, and its purpose is to provide distributed update processing that can effectively prevent waits and deadlocks without impairing responsiveness to users. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the present invention processes message data from multiple input/output devices at the same time in an online system in which update processing is performed on a master file from multiple input/output devices, and updates the master file. A first processing section with a multi-task configuration that temporarily stores such recorded data and returns response message data to each input/output device, and a second processing section with a single-task configuration that updates the master file based on the recorded data. I am trying to prepare for this.

[Effect]

In the distributed update processing method of the present invention, the first processing unit having a multi-task configuration simultaneously processes message data from a plurality of input/output devices and temporarily stores recorded data related to updating a master file. , the response message data is returned to each input/output device, and a second processing section having a single-task configuration updates the master file based on the recorded data.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the distributed update processing method of the present invention.

In FIG. 1, this embodiment has a plurality of input/output devices 11 to 11.
1n, a first processing section 21, a second processing section 22, a first external storage device 31, a second external storage device 32, and a master file 4. Note that the functions of each part will be explained through the following operations.

A plurality of users (not shown) each have an input/output device 11 to
Input the message data of the processing request from in.

The first processing unit 21 has a multitasking configuration, and is activated by message data from the input/output devices 11 to 1n.
These message data are simultaneously processed, and if it is necessary to update the master file 40, the recorded data related to the update (including information specifying the updated data and the data to be updated) is temporarily processed. The stored information is stored in the first external storage device 31, the stored information is stored in the second external storage device 32, and the response message data, which is the processing result for the message data, is sent to each input/output device 1.
Return to 1-1n.

On the other hand, the second processing unit 22 has a single-task configuration, operates upon storing information in the second external storage device 32, and
The first external storage device 31 from the information stored in the external storage device 32
The data recorded in the master file 4 is read in sequence for each process, and the data in the master file 4 is actually updated. Note that the second processing unit 22 has a single-task configuration in order to maintain the order of updates.

In addition, in the above embodiment, the first
External storage device 31. Although the second external storage device W32 was provided,
It may be one storage device.

〔Effect of the invention〕

As explained above, in the distributed update processing method of the present invention, the process of returning response messages is performed by multitasking, and the actual update to the master file is performed by a single task separately from message processing. This has the effect of effectively preventing the occurrence of waiting and deadlock due to concentration of updates to data in the same block of the master file, without impairing responsiveness to users.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the distributed update processing method of the present invention. In the figure, 11 to 1n...input/output device

Claims (3)

[Claims] (1) In an online system where update processing is performed on a master file from multiple input/output devices, message data from multiple input/output devices is simultaneously processed and recorded data related to master file updates is temporarily stored. and a first processing section with a multi-task configuration that returns response message data to each input/output device, and a second processing section with a single-task configuration that updates the master file based on recorded data. Distributed update processing method. (2) The distributed update processing method according to claim 1, wherein the recorded data is stored in the first external storage device, and the stored information is stored in the second external storage device. (3) The second processing unit is characterized in that, upon storing information in the second external storage device, the second processing unit sequentially reads the recorded data in the first external storage device from the stored information and updates the data in the master file. 3. The distributed update processing method according to claim 2.