JP2570134B2 - Data broadcast transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission system for transmitting a file in order to maintain a program or data commonly used on a plurality of computers constituting a node in a medium- to large-scale network system. Information transfer method.

[0002]

2. Description of the Related Art Conventionally, when a program or data used in a distributed processor or a terminal in one network system (hereinafter, a program and data to be transferred is simply referred to as data) is equally updated, the transfer is performed. The transfer source files were secured as many as the previous number, and the same number of file transfer tools were executed individually.

When the computer resources of the transfer source are not sufficient, the transfer has been performed for each transfer destination, or the medium has been transported and registered at the distribution destination.

[0004]

However, in the case of a broadcast file transfer in which the same program or data is to be simultaneously distributed to a plurality of destinations, a conventional file transfer system uses a disk area for each destination on a transfer source computer. Requires a large amount of disk space for tasks that are not always performed, and requires a file transfer program (not necessarily a job but a CPU allocation unit) for each destination. Process or task), which requires main memory as many as the number of simultaneous transfers, thus increasing the load on the source computer system as in the case of the disk area.

When a file transfer program is operated for each destination, a read operation from the disk occurs as many times as the number of destinations even though the data is the same, and the input / output channel and the CPU are used extra. As a result, there is a problem that the load on the computer system is increased and the operation is greatly affected.

In the operation of the file transfer program, the operator responds at the console of the transfer source computer in preparation for incomplete preparation of the destination computer or a network failure. It was difficult to accurately and quickly grasp the information.

If the transfer is interrupted during the operation of the file transfer program due to a failure of the destination computer, a network failure, abnormal termination of the file transfer program, a system failure of the transfer source computer, or if the transfer is interrupted due to system operation, At the time of resuming, it is necessary to retransmit from the beginning of the data, and there is a disadvantage that computer resources are wasted.

[0008]

According to the data broadcast transfer method of the present invention, in a computer system in which a plurality of computers are connected by a communication line, each computer transmits a transfer management file storing transfer information. A transfer management table generating and saving means for creating a transfer management table in the main memory based on the schedule and periodically saving the transfer management table in a transfer management file in preparation for transfer interruption, and a transfer destination address in the transfer management table. Transfer connection disconnecting means for connecting to and disconnecting from each transfer destination computer based on a transfer status code including a line connection status with the computer corresponding to the transfer destination address; and connection to the transfer destination. Communication response information receiving means for receiving response information for data transfer and updating the transfer status including the line connection status in the transfer management table, and a data file reading buffer And transfer means for reading the transfer data via the transfer management table, obtaining the transfer destination address for which the line connection has been completed from the transfer management table, and transferring the data via the transfer buffer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of the present invention. A transfer management table 5 is created in a main memory based on a transfer management file 8 in which transfer information is stored to prepare for transfer interruption. A transfer management table generating and saving means 1 for periodically saving the transfer management table 5 in the transfer management file 8;
A transfer destination connection / disconnection means 2 for connecting and disconnecting each transfer destination computer based on the transfer destination address and the transfer status code, and response information for connection to the transfer destination and data transfer; 5, the transfer data is read via the communication response information receiving means 3 for updating the transfer status of the transfer buffer 5 and the data file read buffer 6, and the transferable transfer destination address is obtained from the transfer management table 5;
And transfer means 4 for performing data transfer via the communication device.

Here, the transfer management table 5 is generated in the main memory of the computer after the start of the system, and the transfer management table generation / save unit 1, the transfer destination connection disconnecting unit 2, the communication response information receiving unit 3, the transfer unit 4 And updated at the same time.

N in the transfer management table 5 of FIG. 1 represents the number of transfer destinations, and a serial number from 1 to N is assigned to each transfer destination. The transfer destination address is used to specify the transfer destination when connecting / disconnecting and transferring data to the transfer destination, and to identify the transfer destination in response from the transfer destination and notification of a failure on the communication line. You.

The transfer management file 8 has the same data items as the transfer management table 5, and is prepared before the start of the present system. When a new transfer is performed, the transfer status record and the transfer completion block number are all 0 (zero), and the transfer destination serial number and the transfer destination address are set by the operator of the system. For operation from the source computer,
In the case where the transfer is started after the interruption due to a system failure or the like, the data content of the transfer management table 5 saved before the interruption is used as it is. In any case, the contents of the transfer management file 8 are generated as the transfer management table 5 by the transfer management table generation / save unit 1.

The data file 9 is data or a program which is commonly transferred to each transfer destination, prepared by an operator before the start of the transfer, and stores only one set of data or program. The blocks in the data file 9 are read by an input / output command in the transfer means 4 and stored in the data file reading buffer 6.

The data file reading buffer 6 includes:
After the system is started, it is secured in the main memory and is referred and updated by the transfer means 4. When there is no block to be transferred in the transfer buffer 7, the transfer unit 4 refers to the data file reading buffer 6. If it is not in the transfer file reading buffer 6, it is read from the data file 9 and stored in the transfer file reading buffer 6. At this time, if there is no free space in the data file reading buffer 6, the data file is replaced with a block having a block number equal to or less than the minimum value of the transfer completion block number in the transfer management table 5. If there is no corresponding block, LRU
(Least Recently Used) Replace with the block selected by the logic.

The transfer buffer 7 is secured in the main memory after the start of the system, and is referred to and updated by the transfer means 4. If the block to be transferred is not in the transfer buffer 7, the transfer means 4 transfers the data file from the data file reading buffer 6 to the transfer buffer 7. At this time, if there is no free area in the transfer buffer 7, the blocks are replaced by the same logic as in the data file reading buffer 6.

The transfer status code shown in FIG. 2 will be described below.

Transfer status code 1: Transfer destination connection disconnecting means 2
Waiting for connection completion notification after connection command is issued by.

Transfer status code 2: a state in which the transfer destination code has already been connected and the block transfer of the transfer completion block number + 1 is waiting.

Transfer status code 3: A state in which a transfer command is issued by the transfer means 4 and a transfer completion notification is waited for.

Transfer status code 4: All blocks have been transferred and waiting for disconnection processing.

Transfer status code 5: A state in which a disconnection completion notification is waiting during a disconnection process after completion of the transfer of all blocks.

Transfer status code 6: A state in which transfer of all blocks has been completed and disconnection has been completed.

Transfer status code 7: Indicates that the communication response information receiving means 3 has received an error that has occurred on the communication line or the destination computer, and is waiting for a disconnection process as a pre-process for continuing the transfer. .

Transfer status code 8: A state in which a disconnection process is in progress and a disconnection completion notification is waiting.

Transfer status code 9: A state in which the disconnection processing at the time of abnormality has been completed, and the transfer destination connection disconnecting means 2 has not issued a reconnection instruction.

First, the general operation of the present invention will be described with reference to FIG.

When a broadcast file transfer request is issued by the operator, the transfer management table generation and saving means 1 is activated (step 3-1), and records are read from the transfer management file 8 to generate the transfer management table 5 (step 3-1). Step 3-2). Next, the transfer management table generation / save unit 1 sequentially activates the communication response information receiving unit 3, the transfer destination connection disconnecting unit 2, and the transfer unit 4 (steps 3-3, 3-4, 3-5).

Thereafter, the transfer management table 5 is stored in the transfer management file 8 at regular time intervals in preparation for interruption due to a system failure or the like.
(Steps 3-6 and 3-7), and it is determined whether the transfer to all the transfer destinations has been completed at the same time based on whether the transfer status code in the transfer management table 5 is 6 (step 3-6).
8).

When it is determined that the transfer to all the transfer destinations has been completed, the transfer means 4, the transfer destination connection disconnecting means 2, and the communication response information receiving means 3 are sequentially stopped (steps 3-9, 3-9).
10, 3-11), and transfer management table 5 to transfer management file 8
After the transfer, the transfer management table generation and save unit 1 also stops (step 3-12).

The transfer management table generation / save unit 1 can be interrupted by the operator. In this case, the transfer management table generation unit 1 saves the generated transfer management table 5 in the transfer management file 8. Stop.

The operation of the transfer destination connection disconnecting means 2 will be described in detail with reference to FIG.

When the transfer destination connection disconnecting means 2 is activated by the transfer management table generating / saving means 1, it refers to the transfer status code in the order of the transfer destination serial number in the transfer management table 5 and connects or disconnects the communication line. Make a decision and perform the processing.

The transfer status code is 0 (waiting for connection) or 9
In the case of (abnormal disconnection completed) (step 4-2), a connection command is issued to the transfer destination (step 4-2).
3), change the transfer status code to 1 (step 4-)
4).

When the transfer status code is 1 (a connection command was issued, but a connection completion notification could not be received within a predetermined time),
4 (all block transfer completed, waiting for disconnection), 5
(All blocks have been transferred and a disconnection command has been issued, but a connection completion notification has not been received within a certain period of time), 7 (An error has been received by the communication line and the transfer destination computer, and a disconnection process is waiting). 8 (A disconnection command was issued when an error occurred.
If no disconnection completion notification has been received within a certain period of time (step 4-5), a disconnection instruction is issued to the transfer destination (step 4-6), and the transfer status code is set to 8, 5 respectively. The setting is changed to 5, 8, 8 (step 4-
7). The above process is sequentially repeated for all the transfer destinations (steps 4-8 and 4-9). When the process for all the transfer destinations has been completed, the process is stopped for a certain period of time (step 4-9), and the same process (Steps 4-1 to 4-
Up to 10).

The operation of the communication response information receiving means 3 will be described in detail with reference to FIG.

The communication response information receiving means 3 is started by the transfer management table generating / saving means 1 and is stopped until receiving the communication response information after being ready to receive the communication response information from the communication line. When the communication response information is received (step 5-1), the communication response information is determined.

The communication response information is a connection completion notification (step 5).
-2) or block transfer completion notification (step 5-
In the case of 3), the transfer status code in the transfer management table 5 is changed to 2 (step 5-4). In the case of an abnormal notification (step 5-5), the transfer status code is changed to 7 (step 5-6).

Incidentally, the communication response information receiving means 3 also terminates after being interrupted by the stop command from the transfer management table generating / saving means 1 or by the operator.

The operation of the transfer means 4 will be described in detail with reference to FIGS.

The transfer means 4 activated by the transfer management table generation / save means 1 has a transfer status code of 2 in the transfer management table 5.
It is checked whether or not there is a transfer destination (step 6-2).

If there is no transfer destination, a fixed time interval
Referring again to the transfer management table 5, the check of the presence / absence of the transfer destination with the transfer status code of 2 is repeated.

If there is a transfer destination, the minimum value of the transfer completion block number is determined for the transfer destination having the transfer status code of 2 (step 6-3). It is determined whether the minimum value is 1 or more and it is equal to the number of blocks (step 6-4).

Here, the number of blocks means the data file 9
The initial value is set to zero (0) immediately after the transfer means 4 is started, and the immediately preceding block number is set as the number of blocks when the file end record of the data file 9 is detected. If the minimum value of the transfer completion block number is 1 or more and is equal to the number of blocks, it is determined that all blocks have been transferred, and the transfer status code is changed to 4 (step 6-5). If the minimum value is not equal to 0 or the number of blocks, it is determined that data transfer is required, and it is checked whether or not a block having the block number of the minimum value of the transfer completion block number + 1 is present in the transfer buffer 7 (step 6). -6).

If there is a block having a block number of (the minimum value of the transfer completion block number + 1), the transfer instruction is issued as it is (the processing shifts to step 7-11 and thereafter). If not, the data file reading buffer 6 is checked (step 6-7). If the block with the minimum transfer completion block number + 1 block number is present in the data file reading buffer 6, the block is transferred to the transfer buffer 7 and a transfer instruction is issued (the processing proceeds to step 7-6 and thereafter). Move on).

When transferring to the transfer buffer 7, the transfer buffer 7 is checked (step 7-6), and if there is a free area, the corresponding block is selected (step 7-8). Checks whether there is a block having a number equal to or less than the minimum value of the transfer completion block number of the entire transfer management table 5 (step 7-7), and if there is, selects the corresponding block (step 7-8), If not, the block selected by the LRU logic is selected (step 7-9).
Next, the block selected in step 7-8 or step 7-9 is transferred to the corresponding block in the transfer buffer 7 (step 7-10).

If there is no block having the block number of the minimum value of the transfer completion block number + 1 in the data file reading buffer 6, the corresponding block is read from the data file 9 (step 6-8). If the file end record is detected when reading the data file 9 (step 6-9), the minimum value is set as the number of blocks (step 6-10), and the transfer status code of the transfer management table 5 is again set to 2 Then, the processing returns to the processing for obtaining the minimum value of the transfer completion block.

When the corresponding block is read from the data file 9 (step 6-8), if there is no free area in the data file reading buffer 6, it is replaced by the same logic as the transfer buffer 7 (step 7-). 1 to step 7-5).

Thereafter, the data is transferred to the transfer buffer 7 (steps 7-6 to 7-10), a transfer command is issued, and the data is transferred to the corresponding transfer destination (step 7-11).

After the transfer instruction is issued, the transfer code of the transfer destination is changed to 3 (during block transfer) (step 7-1).
2) While there is another transfer destination having the minimum value in the transfer completion block number, the transfer from the transfer buffer 7 and the process of changing the transfer status code to 3 are repeated (step 7-1).
1 to step 7-13). If there are no such destinations,
Again, the process returns to the process of obtaining the minimum value of the transfer completion block number for the transfer destination having the transfer status code of 2.

In the case of the transfer means 4 as well, the transfer management table generation / save means 1 is stopped by a stop command or interrupted by the operator and ended.

Hereinafter, a specific operation example showing the features of the embodiment of the present invention will be described with reference to FIG.

According to the transfer management table 5 shown in FIG. 8, since there is a transfer destination having a transfer status code of 2, the minimum value of the transfer completion block number is obtained as 7 among them. Number of blocks is 10
Therefore, the transfer of the block with the block number 8 is necessary, but since the block number 8 is not in the transfer buffer 7,
Block number 8 of data file reading buffer 6
Is transferred to the transfer buffer 7. At this time, since there is no free space in the transfer buffer 7, the block number 8 is stored in the area of the block number 10 which is used less frequently by the LRU logic.
To store the block.

Next, a transfer instruction of the block number 8 is issued to the transfer destination address A, and the transfer instruction is changed to the transfer status code 3. Further, after performing the same processing for the transfer destination address D having the same transfer completion block number 7, the process returns to the processing for finding the transfer destination having the transfer status code of 2 again.

In this embodiment, even if the number of transfer destinations increases, the number of data files is one and the number of each means is one.
Hardly increases. The data read time can also be minimized by using two types of buffers, minimizing the load on the source computer, and allowing efficient broadcast data transfer. Furthermore, by prioritizing the transfer to the transfer destination having the smaller transfer completion block number, the broadcast performance is improved, and the efficient use of the system resources becomes possible.

Further, when the processing is interrupted due to a system failure or the like, the processing can be continued based on the transfer management table saved immediately before. If transfer to some transfer destinations is not completed due to a line failure, etc., once the operator intervenes,
Processing is interrupted, and processing can be continued with a simple operation after recovery from a failure. At this time, the operator
By referring to the transfer management file, the transfer status can be ascertained even during transfer, and a failure recovery process can be performed.

Therefore, it is possible to promptly deal with a failure and to minimize waste of system resources.

[0058]

As described above, the same program or data is transferred from one computer to another plurality of computers on a medium / large-scale network system in which a plurality of computers are connected by a communication line. By using the data broadcast transfer method of the present invention,
Minimize computer resource usage at the source
This has the effect of increasing transfer efficiency.

Even in the event of a failure, it is possible to minimize the waste of system resources due to retransmission by using the latest data of the transfer management file, and to allow the operator to accurately grasp the transfer status and quickly respond to the failure. Become.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a block configuration diagram of the present invention.

FIG. 2 is a code list of transfer status codes in a transfer management table.

FIG. 3 is a flowchart of a process of a transfer management table generation / save unit.

FIG. 4 is a flowchart of a process of a transfer destination connection disconnecting unit.

FIG. 5 is a flowchart of a process of a communication response information receiving unit.

FIG. 6 is a flowchart of processing of a transfer unit.

FIG. 7 is a flowchart of processing of a transfer unit.

FIG. 8 is a schematic diagram for explaining an operation example of FIGS. 6 and 7;

[Explanation of symbols]

 1 transfer management table generation / save means 2 transfer destination connection disconnecting means 3 communication response information receiving means 4 transfer means 5 transfer management table 6 data file reading buffer 7 transfer buffer 8 transfer management file 9 data file 10, 11, 12 communication line

Claims (2)

(57) [Claims] In a computer system in which a plurality of computers are connected by a communication line, each computer creates a transfer management table in a main memory based on a transfer management file storing transfer information, Transfer management table generation and saving means for periodically saving a transfer management table in a transfer management file in preparation for transfer interruption; a line between a transfer destination address in the transfer management table and a computer corresponding to the transfer destination address Based on the transfer status code including the connection status, transfer destination connection disconnecting means for connecting and disconnecting to each transfer destination computer, and receiving response information for connection to the transfer destination and data transfer, and Communication response information receiving means for updating the transfer status including the line connection status, and reading the transfer data via the data file reading buffer and checking the transfer management table Obtain the forwarding address line connection is completed, the data broadcast transfer method characterized by comprising a transfer means for transferring data through a transfer buffer. 2. The transfer management table includes a transfer destination serial number, a transfer destination address, a transfer status code including a line connection status between a computer corresponding to the transfer destination address, and a transfer completion block number. 2. The data broadcast transfer method according to claim 1, wherein the transfer management table is periodically saved in a transfer management file in order to enable quick recovery in the event of a failure.