JP2853737B2 - Distributed information processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention exists in a distributed manner with a client system unit which performs distributed processing (parallel data processing and mutual data reference, etc.) by sharing data with another client system unit. The present invention relates to a client / server type distributed information processing system having a server system unit that manages data communication between a plurality of client system units.

[0002]

2. Description of the Related Art Conventionally, as this type of distributed information processing system, a distributed information processing system relating to a "distributed database" is widely known. In such a distributed information processing system,
In order for a plurality of users to access the same data and perform cooperative work at the same time, it is necessary to manage the data update timing using the data operation right and to communicate the update information simultaneously with the data update. As such a distributed information processing method, for example, a “distributed cooperative work support device” described in Japanese Patent Application No. 5-37694 is known.

FIG. 4 is a block diagram (a block diagram for explaining an example of a conventional distributed information processing system) showing a configuration of a distributed cooperative work support device described in this publication.

This distributed cooperative work support apparatus comprises a plurality of client system units 401 and 411 for performing interactive processing with a user and a single server system unit 402 for processing shared data.

[0005] In this distributed cooperative work support apparatus, in order to exclusively process shared data in the client system unit 401, the operation right of each data is managed in the shared data management unit 407 in the server system unit 402.

[0006] The client system unit 401 requests an operation right from the server system unit 402 when updating data. Thereafter, the shared data transferred from the shared data storage unit 408 is managed by the data storage unit 410, and the shared data in the data storage unit 410 is referenced and updated by the data management unit 404.

When the shared data is updated in the client system unit 401, data update information is created,
The data update information is immediately notified to the server system unit 402, and the shared data in the shared data storage unit 408 is also updated. Further, the data update information is stored in the shared data storage unit 408, and is referred to by another client system unit 411. Thereby, the shared data of the data storage unit (not shown) corresponding to the other client system units 411 is also updated.

Further, another client system unit 411
Is updated to the client system unit 401 in the same manner. In this manner, the client system unit 401 and the client system unit 411 can refer to each other for the data update state.
And 411 can be cooperated.

As described above, in the conventional distributed cooperative work support apparatus, shared data held in the server system unit 402 can be cooperatively distributed and processed by the plurality of client system units 401 and 411. it can.

However, in this prior art, if data is read, updated, and written simultaneously with another client system unit 411 in a certain client system unit 401, there is a possibility that data mismatch will occur. The unit 401 needs to inquire the server system unit 402 about permission / non-permission of the data operation at the time of data operation.

As described above, in the conventional distributed information processing system, each client system unit has to always inquire the server system unit when processing shared data.

[0012]

In the above-mentioned conventional distributed information processing system, each client system unit must always inquire the server system unit when processing shared data. There was a problem.

A delay occurs during data manipulation, and the work efficiency is reduced.

[0014] The communication traffic for the inquiry increases,
As a result, the communication capacity of the network line is exceeded, and the system (a system in which a client / server type distributed information processing system is realized) causes a significant delay in communication.

In distributed cooperative work by a plurality of client system units, transmission and reception for distributed processing are repeatedly performed between the server system unit and each client system unit. Are repeated, and communication waste increases.

In view of the above, an object of the present invention relates to data to be subjected to cooperative processing (referred to as "shared information"), and separately from data contents, a communication type, a communication (access) time, and a communication data amount. By maintaining communication management information in advance and performing communication between the client system unit and the server system unit according to a scheduled procedure, it is possible to realize reference and update of shared data at high speed and with a small data communication amount. An object of the present invention is to provide a distributed information processing method that can be used.

[0017]

According to the distributed information processing method of the present invention, a client system unit for sharing data with another client system unit to perform distributed processing, and a plurality of distributed client systems In a client / server type distributed information processing system having a server system unit for managing data communication between units,
The shared information buffer in the client system unit that temporarily holds shared information to be processed, one or more processing modules in the client system unit that performs data processing of the shared information in the shared information buffer, and the own client are related. A communication management table in the client system unit holding communication management information in which an access time and a data communication amount are described for each piece of shared information, and a clock clocked by the communication management table and the clock unit. A communication module in the client system unit that transmits and receives the shared information to and from the server system unit, a shared information database in the server system unit that holds the master data of the shared information, and each shared information for each of all the client system units. About A communication management database in a server system unit that holds communication management data describing access times and data communication amounts, and shared information held in the shared information database with reference to a clock measured by the communication management database and a clock unit. And a communication management server module in the server system unit for transmitting and receiving data to and from each client system unit.

[0018]

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the distributed information processing system according to the present invention.

The distributed information processing system according to this embodiment includes a server system unit 100 and a plurality of client system units 20 connected to the server system unit 100 via a network or the like.
0 is included. In order to distinguish each of the plurality of client system units 200, a unique client system number is assigned (in the following description, it is necessary to distinguish each client system unit 200 in FIG. 1). In some cases, as shown in FIG. 1, reference numerals “200”, “200 ′” and “20”
0 "").

The server system unit 100 includes a shared information database 101 that holds master data of shared information of the client systems 200 that are distributed and a communication management database 103. A communication management server module 102 for transmitting data to the client 200 and receiving data from the client system 200 to the shared information database 101;
It is configured to include a communication management database 103 that holds each piece of communication management information for each 0 as communication management data, and a clock unit 104 that measures time.

The client system unit 200 performs a process on the shared information held in the shared information buffer 201 according to an application program, and a shared information buffer 201 for holding shared information which is data to be distributed. One or more processing modules 202
A communication module 203 that transmits data from the shared information buffer 201 to the server system unit 100 and receives data from the server system unit 100 to the shared information buffer 201 with reference to the communication management table 204; Existing client system unit 20
The communication system includes a communication management table 204 for holding communication management information regarding 0) and a clock unit 205 for measuring time.

Data can be exchanged between the communication management server module 102 in the server system unit 100 and the communication module 203 in each client system unit 200. The communication management server module 102 includes a plurality of client system units 200 (200, 200 ', and 20).
0 ″) has a function of sequentially and intensively processing data transmission and reception.

In the distributed information processing system of the present embodiment, communication between the server system unit 100 and the client system unit 200 as shown in FIG.
03 and the communication management table 204. FIG. 2 is presented to explain this communication technique.

FIG. 2 is a diagram showing an example of the configuration of the communication management information in the communication management database 103 and the communication management table 204.

The communication management information in the communication management database 103 and the communication management table 204 includes a “shared information number”, a “system status number”, and the processing module 201 of each client system unit 200 Whether writing (writing) (w (write)) is performed or reading (r (re
ad)), “access time information” indicating the time of receiving (receiving for reading) or transmitting (transmitting for writing) the shared information, and The "communication data size" indicates the amount of data to be transmitted and received when information is communicated.

The following items (1) to (4) will be described for each item in the communication management information.

The shared information commonly processed by the client system units 200 is divided into units for writing or reading, and a shared information number, which is a unique number for distinguishing each shared information, is assigned. . The communication management information includes such “shared information number” and “access attribute information” indicating the type of write and read access as described above.

According to the state of the progress of the distributed processing,
The communication state such as the type of communication data and the data size changes. The state of the progress of the distributed processing is called a system status, and a unique system status number is assigned to the system status. Since the mode of communication (transmission / reception) of the shared information changes for each system status, the communication management information includes a “system status number”.

In the example of FIG. 2, the access time information is
It has a format of "hour: minute: second: millisecond". The numerical value of each unit (hour, minute, second, and millisecond) and the clock value measured by the clock unit 104 or 205 are compared and collated, and if they match, communication of the corresponding data (shared information) is performed. Done. Note that “*” in FIG. 2 means that the value of the unit is an arbitrary value.

In the example of FIG. 2, the shared information having the shared information number 1 is four times per second (0 ms, 2 ms) when the system status number is 20.
50 ms, 500 ms, and 750 ms) only 10
It is shown that a 0-byte data amount is received and the shared information is read. For the shared information with the shared information number 2, only three times (100 msec, 433 msec, and 766 msec) per second when the system status number is the 50th system status.
It is shown that a 200-byte data amount is transmitted and the shared information is written.

As described above, the communication management information describes all information necessary for communication of the shared information.

The communication management table 204 in the client system section 200 holds the above-mentioned communication management information on the client.

The communication management database 103 in the server system unit 100 stores the communication management information for each client system unit 200 with information indicating which client system unit 200 the communication management information relates to (for example, “client system unit 200”). No.) is held.

A specific client system unit 20 in the communication management database 103 in the server system unit 100
The communication management information corresponding to 0 and the communication management information in the communication management table 204 in the client system unit 200 correspond to each other. That is, the “shared information number” in a certain entry in both communication management information,
"System status number", "access time information",
And “communication data size” have the same contents, and “access attribute information” has the opposite attributes.

FIG. 3 is a flowchart showing the processing of the communication module 203 in the client system unit 200 in the distributed information processing system of this embodiment. This processing includes a current system status acquisition step 301, a system status comparison determination step 302, an end status determination step 303, a communication management table access step 304, an entry extraction step 305, an extracted entry presence / absence determination step 306, List creation step 307, clock reference step 308, processing time appropriateness determination step 309, transmission / reception processing step 310
Immediately preceding process repeating process determining step 311, immediately preceding process inserting step 312, and immediately preceding process deleting step 313.
Consists of

Next, the operation of the distributed information processing system of this embodiment having the above-described configuration will be described.

First, the operation of the client system unit 200 will be described.

The communication module 203 in the client system unit 200 performs communication (transmission and reception of shared information) with the server system unit 100 based on the communication management table 204.

The plurality of processing modules 202 and the communication modules 203 sequentially (for example, perform processing such as pipeline processing) with respect to certain shared information.

The communication module 203 performs the following processing for transmitting and receiving the shared information (see FIG. 3).

First, the current system status is obtained at regular time intervals (step 301), and it is determined whether the previously obtained system status is different from the current system status (step 302).

If it is determined in step 302 that "the two system statuses are different", it is determined whether or not the current system status is "end status" (step 303).

If it is determined in step 303 that "the current system status is" end status "", the process is terminated.

On the other hand, if it is determined in step 303 that "the current system status is not" end status "", the communication management table 204 is accessed (step 304), and an entry matching the current system status (current An attempt is made to extract an entry having the system status number of the system status from the communication management table 204 (step 305), and it is determined whether or not extraction was actually possible (whether there was an entry to be extracted). (Step 306).

If it is determined in step 306 that "extracted entry exists", a processing list is created in which the extracted entry groups are sorted in chronological order based on the access time information in the entry group (step 307).

When it is determined in step 306 that "extraction entry did not exist" or when the processing in step 307 has been completed and a predetermined time interval has elapsed, control is returned to the processing in step 301.

If it is determined in step 302 that both system statuses are the same,
(Step 3)
08), it is determined whether the first entry of the processing list created in step 307 is the processing time (whether the current time indicated by the clock has reached the time of the access time information in the entry) (Step 309).

If it is determined in step 309 that "the first entry of the processing list has reached the processing time",
The transmission / reception processing of the shared information related to the entry is performed (step 310). Here, when the access attribute information in the entry is “w” indicating “write”, transmission processing of the shared information is performed, and when the access attribute information is “r” indicating “read”, the shared information of the shared information is transmitted. Perform reception processing. In this transmission / reception processing, the communication data size in the entry is considered.

In this way, each client system unit 200 receives the shared information to be read, if any, based on the communication management table 204, and stores the shared information in the shared information buffer 201. Similarly, if there is any relevant shared information to export,
The shared information is extracted from the shared information buffer 201, and the shared information is transmitted to the server system unit 100.

When the transmission / reception processing in step 310 is completed, it is determined whether or not the transmission / reception processing (the immediately preceding processing) is a repetitive processing (a processing that is repeatedly executed after a predetermined time) based on the access time information in the entry. Is determined (step 311).

If it is determined in step 311 that the immediately preceding process is a repetitive process, this process is added to the process list based on the next process time that can be recognized by the access time information in the entry relating to the immediately preceding process. Insert again (step 312).

When it is determined in step 311 that the immediately preceding process is not a repetitive process, or when the process in step 312 is completed, the immediately preceding process is deleted from the process list (step 313), and a predetermined time interval is set. When the time has elapsed, the control is returned to the process of step 301.

Second, the operation of the server system unit 100 will be described.

As described above, the server system unit 100
Has a communication management database 103 holding communication management data having communication management information corresponding to each of the client system units 200, 200 ', and 200''.

The communication management server module 102 in the server system unit 100
In the process of sequentially processing communication with 0, 200 ', and 200'', the following processing is performed.

System status and clock section 104
And a clock timed by

Based on the communication management database 103, one of the client system units 2 at the current time
If there is shared information to be read from 00, reception processing of the shared information is performed, and the received shared information is stored in the shared information database 101.

Similarly, if there is any shared information to be written to any of the client system units 200 at the current time based on the communication management database 103, the shared information is extracted from the shared information database 101, and the shared information of the shared information is extracted. A transmission process to the client system unit 200 is performed.

The details of the process are the same as those shown in FIG. However, information (client system number and the like) for identifying the client system unit 200 of the transmission / reception partner exists in the entry in the processing list. The access target in step 304 is:
It is not the communication management table 204 but the communication management database 103. Further, in the transmission / reception processing in step 310, the client system 200
Is recognized, and transmission / reception to / from the client system unit 200 is performed.

Finally, in the following, some additional explanations regarding the present embodiment and, eventually, the distributed information processing system of the present invention will be given.

In the transmission of the shared information, the transmission of the shared information individually requires much communication procedure. Therefore, the normal management server module 102 and the communication module 203 refer to the communication management database 103 and the communication management table 204, respectively, and
If there is shared information to be transmitted at the same time, transmission is performed in a single transmission procedure in a single block. However, this blocking is not an essential processing content for the present invention.

Similarly, in the case of receiving shared information, individually receiving the shared information individually involves a lot of communication procedure waste. Therefore, the communication management server module 102
The communication module 203 refers to the communication management database 103 and the communication management table 204, respectively, and if there is shared information to be received at the same time, collects it into one block and performs reception in one reception procedure. However, this blocking is not an essential processing content for the present invention.

In the distributed cooperative operation, reading and writing are not performed on the same shared information at the same time in order to avoid data mismatch.
Here, there is a case where certain shared information is read, and the shared information is written after data processing related to the shared information. In this case, in the processing of the present invention, different shared information numbers are assigned to the shared information to be read and the shared information to be written, or the access time information for both transmission and reception is stored in the communication management database 103 and the communication management table 204.
Can be dealt with.

The system status is data indicating the execution status of the shared information distributed processing, and is data that is processed in common by the server system unit 100 and the client system unit 200. Therefore, the system status corresponds to one of the shared information. . Therefore, data indicating the system status can also be shared as shared information as described above.

The communication state of the shared information can be dynamically updated by updating the contents of the communication management database 103 and the communication management table 204 as needed.

According to the present embodiment and thus the present invention,
Each client system unit 200 is the server system unit 1
00, and realizes distributed information processing in a plurality of client system units 200 by providing a function of simultaneously referencing or updating the same data (shared information) by a plurality of client system units 200 by transmitting and receiving the same data (shared information). Can be.

[0068]

As described above, according to the present invention,
A communication management database in a server system unit and a communication management table in a client system unit when realizing various distributed information processing operations while referring to and updating data (shared information) processed in a plurality of client system units in parallel. By setting the communication management information in (1), there is an effect that wasteful communication procedures can be omitted and high-speed distributed processing can be realized.

Since the communication functions in the server system unit and each client system unit are independent,
Regardless of the computer environment, it is also possible to arrange a plurality of processing modules and realize parallel processing. As a mode of data transfer (communication) between the client system unit and the server system unit, not only network communication but also It is also possible to employ serial communication or wireless communication, which has the effect of providing flexibility in the system configuration.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram for explaining communication management information managed by a communication management database and a communication management table in FIG. 1;

FIG. 3 is a flowchart showing processing of a communication module in a client system unit in FIG. 1;

FIG. 4 is a block diagram illustrating an example of a conventional distributed information processing method (distributed cooperative work support device).

[Explanation of symbols]

REFERENCE SIGNS LIST 100 server system unit 101 shared information database 102 communication management server module 103 communication management database 104, 205 clock unit 200 (200, 200 ′, 200 ″) client system unit 201 shared information buffer 202 processing module 203 communication module 204 communication management table

Claims (3)

(57) [Claims] 1. A client system unit for performing distributed processing by sharing data with another client system unit, and a server system unit for managing data communication between a plurality of distributed client system units. In a client / server type distributed information processing system having: a shared information buffer in a client system unit for temporarily holding shared information to be processed; and a client system for performing data processing of the shared information in the shared information buffer. A communication management table in a client system unit that holds communication management information in which access time and data communication amount are described for each piece of shared information related to its own client; and a communication management table and a clock. Refer to the clock clocked by the A communication module in the client system unit for transmitting and receiving the shared information in the shared information buffer to and from the server system unit; a shared information database in the server system unit holding master data of the shared information; A communication management database in a server system unit holding communication management data in which access time and data communication amount are described for each piece of shared information with respect to each of the shared information; and the shared information by referring to a clock clocked by the communication management database and a clock unit. A distributed information processing system, comprising: a communication management server module in a server system unit that transmits and receives shared information held in a database to and from each client system unit. 2. A communication management table in a client system unit holding communication management information having information indicating which system status is accessed for each shared information, and which system status is accessed for each shared information. 2. A distributed information processing system according to claim 1, further comprising: a communication management database in a server system unit that holds communication management data having information indicating whether the communication is performed. 3. The communication management information in the communication management table in the communication management table in the client system unit and the communication management information in the communication management data in the communication management database in the server system unit are “shared information number”, “system status number”, and “access attribute”. Information "," access time information ",
3. The distributed information processing system according to claim 2, further comprising items of "communication data size".