JPH0736811A - Method and system for information delivery - Google Patents

Abstract

PURPOSE:To provide an information delivery method capable of preventing the leakage of transmission at the time of switching without reducing a transmission speed in an asynchronous dual system. CONSTITUTION:Information obtained by allocating serial numbers to information units is received by transmission servers 1a, 1b connected so as to be mutually asynchronously driven and having the same constitution, processing information from an I/O processing means 10 is transmitted from one transmitting server connected to a transmitted destination 5 through a switching device 4. The processing information is stored also in a storage means 20, and when a connection state with the destination 5 is switched to the other transmitting server, a monitoring means 30 mutually compares the newest serial numbers (processing numbers) transmitted by both the managed servers 1a, 1b and a restoring means 40 reads out omitted information due to switching from the means 20 and transmits the read information to the destination 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dual type information distribution system for distributing information in real time, and more particularly to a function for preventing information leakage when switching from an active system to a standby server.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional information distribution system composed of a duplicated computer. Input device 1
The input information from 01 is separated and transmitted to the distribution servers 100A and 100B by the separating device 102, respectively. The servers 100A and 100B have input processes 110A and 110, respectively.
B, edit processing 120A, 120B, arithmetic processing 130A,
130B, output processing 140A, 140B, and the processing units of both distribution servers.
The synchronization device 103 performs processing while synchronizing, and passes the output information to the collation device 104. The matching device 104 is
The output information of both servers is collated, and if they match, the information is output to the output device 105.

In this way, since both computers are synchronized and data is distributed while being collated, even if one computer stops due to a failure, one computer can take over without losing the information. Such a processing method is known in the art and is called a dual system.

[0004]

In the conventional dual system, loss of information can be completely prevented, but a dedicated mechanism for synchronization is required, and it is in a system where immediacy is more important than reliability. Is complicated and expensive. Furthermore, in order to synchronize all the information one by one,
In each process from input to delivery, there is a drawback that one of them always waits for information to be held, and the transmission speed decreases.

An object of the present invention is to overcome the above-mentioned problems of the prior art and to provide a dual system having an active system and a standby system.
An object of the present invention is to provide an information distribution method capable of preventing transmission leakage at the time of switching without lowering the distribution speed during normal operation.

Another object of the present invention is to provide a dual type distribution device with a simple leak prevention means in accordance with the information in the case of distributing various kinds of information in real time, so that the immediacy and reliability of the information can be improved. It is to provide an information distribution system that secures.

[0007]

The above-mentioned object of the present invention is to receive information in which a serial number of a serial number is added to an information unit by two distribution servers operating asynchronously with each other.
In the information delivery method of delivering from one delivery server that is in connection with the delivery destination, both servers perform delivery processing and store the received information, and the connection state with the delivery destination is from the one delivery server to the other. This is achieved by referring to the serial number of the information that has undergone the distribution processing by both servers when switching to the distribution server, and reading the missing information due to switching from the stored information and distributing it.

Another object of the present invention is that an identifier (ID) indicating an information source and / or a type of information is given to each information unit, and the accumulation of the processing information by the distribution server has a predetermined identifier. Is achieved by doing.

[0009]

According to the present invention, two computers that perform information distribution processing can immediately recover information leakage at the time of switching by mutually reporting the serial number detected from the information. The information to be stored may be cyclically updated in units of at most. Moreover, each process from reception to distribution by both computers operates asynchronously with each other, so no dedicated device for synchronization is required and there is no waiting time, so real-time distribution is possible even when there is a large amount of information. It will be possible.

Further, according to the present invention, an ID is given to each information source or each information type, and information having a high priority is immediately retransmitted from the stored information of the information distribution device, and leak information at the time of switching, Low priority non-immediate information is required
At the end of the series of information, the information source is retransmitted. According to this, even in a large-scale information transmission system that distributes various kinds of information from a plurality of information sources for a long time, by providing a simple information distribution device, both real-time distribution and improvement of information reliability can be achieved. Can be realized.

[0011]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows the configuration of an information transmission system, and mainly shows an information delivery apparatus including a dual-configured information delivery computer 1 and its switching device 4.

Of the two information distribution computers 1a and 1b that receive information from the information source 2, the one whose output lines 3a and 3b are connected to the destination serves as the distribution server, and is connected to the terminals 5a to 5n. Information is distributed. The switching device 4 uses one of the predetermined ones as an active system to connect its output line to the terminal.

The information distribution computers 1a and 1b have the same configuration and are operated asynchronously with each other. Input / output processing means 1
Reference numeral 0 has an input processing means 11 for inputting information, an output processing means 12 for outputting information, an editing processing means (not shown), etc., and outputs the processing information to the output line 3 in real time and the information storage means 20. And output to the survival monitoring means 30.

When information is broadcast from the information distribution computer 1 to each terminal 5, the input / output processing means 1 is used.
0 is only input / output processing, and the input information is output as it is as output information immediately. Note that, hereinafter, the output information from the input / output unit 10 will be referred to as processing information.

The information storage means 20 is an input / output processing means 10.
Store a predetermined number in the information unit from. Survival monitoring means 30
Is a serial number detecting means 31 for detecting the serial number assigned to the processing information from the input / output processing means 10, and the detected serial number is reported to the survival monitoring means 30 of the other system to notify the latest information of the own system and the other system. The serial number management means 32 manages a serial number (hereinafter referred to as a processing serial number), and the recovery instruction means 33 monitors a stop of another system and issues a recovery instruction. Recovery means 40
Has a difference serial number generation unit 41 that has been omitted by switching, and a unit 42 that reads and outputs information corresponding to the difference serial number from the storage unit 20.

FIG. 2 is a flow chart for explaining the normal processing operation of the information distribution computer 1. First, in step S101, the information from the information source is received, and the processing information processed by the input / output processing means 10 is output to the output line 3 in real time.

FIG. 3 shows the format of the information received, and each information is given a serial number of a serial number that is sequentially incremented. The data group of each serial number is divided into frames of a predetermined length, and the number is indicated by the data length. When no special editing or processing is performed by the input / output unit 10, the processing information has the same format as the received information.

On the other hand, the processing information of the processing means 10 is stored in a predetermined number while being cyclically updated in the information storage means 20 (step S102). In a typical system, one to a few stores are sufficient. Further, in step S103, the survival monitoring unit 30 detects the serial number from the processing information and updates the stored processing serial number of its own system.

In step S104, the processing serial number is transmitted / received to / from the survival monitoring means 30 of the other system. In step S105, it is monitored whether the processing serial number of the other system is received within a predetermined period, and if received, the stored processing serial number of the other system is updated. On the other hand, when the processing sequence number of the other system is not received, it is determined that the operation of the other system is stopped, and the recovery process described later is performed. It should be noted that the transmission and reception of the processing sequence number with the other system may be executed at a predetermined cycle, and no synchronization processing is required.

Instead of monitoring the processing serial number of the other system in step S105, the generation of a switching signal from the line switching device 4 is monitored by the survival monitoring means 30 and a recovery process is performed when the switching signal is received. You may

Next, the recovery processing of missing information at the time of switching will be described. Information distribution computer 1a and information distribution computer 1b
Since the above-described series of processing is performed exactly the same, regardless of which server actually distributes information, the other information distribution computer can take over the processing. In the following example, it is assumed that a failure occurs in the active system 1a, the switching device 4 is activated, and the standby system 1b up to that point is switched to the active system.

When the information distribution computer 1a is stopped due to a failure, the line switching device 4 detects the disconnection of the signal from the information distribution computer 1a and immediately switches the line to the information distribution computer 1b side. The signal disconnection time is configured to be as small as possible. However, this outage is inevitable and the information distribution computer 1a
Since 1 and 1b perform processing asynchronously, if the information delivery computer 1b that takes over the processing is ahead of the delivery processing as compared to 1a, the delivery information for the terminal 5 will be lost due to switching. To do.

FIG. 4 is a flow chart for recovering information loss at the time of switching. This recovery process is step S1.
It is started when the operation stop of the other system 1a is confirmed by the survival monitoring of 05 or the switching signal from the line switching device 4. First, in step S201, the survival monitoring unit 30
Compares the processing sequence numbers of the managed own system 1b and the other system 1a, and terminates the process if the processing sequence number of the own system is small.

If the processing serial number of the own system is higher than that of the other system, the output information of the own system is ahead of the output information of the other system which has been distributed until then, and the information is omitted due to the switching. Therefore, in step S202, the processing serial number of the own system and the processing serial number of the other system are output to the recovery means 40b to instruct recovery.

The recovery means 40b, in step S203,
The difference between the received processing sequence numbers of the own system and the other system is calculated, and a difference sequence number from the sequence number obtained by adding 1 to the processing sequence number of the other system to the processing sequence number of the own system is generated, and this difference sequence number is dealt with in step S204. Information is read from the storage means 20 and output line 3b
And outputs the missing information to each terminal 5 via the switching device 4. When the processing of all the differential serial numbers is confirmed in step S205, the recovery processing ends. At each terminal 5, the distribution information can be sorted in the order of the serial numbers to restore the original order of the information.

Note that the normal information distribution process shown in FIG. 2 is in parallel during the above-described missing information recovery process.
Therefore, in order to prevent the information from the input / output means 10b and the information from the recovery means 40b from interfering with each other, the exclusive information processing (not shown) gives priority to the normal information distribution and maintains the real-time distribution.

According to this embodiment, the dual configuration 2
Since the information distribution computers of the units perform the same processing by the same configuration asynchronously, there is no transmission delay and real-time distribution can be maintained. Moreover, since the information leakage at the time of switching is simply checked from the serial number and the recovery processing is performed, the reliability of the distribution information can be improved.

Next, a second embodiment of the present invention will be described.

In a large-scale information transmission system including global information such as recent financial and stock transaction information, an information distribution device that receives and distributes information is close to full operation in 24 hours, High density. Therefore, the time that can be spent on batch processing other than real-time processing is short,
The time zone is also limited. Therefore, when the immediacy of information is of utmost importance, processing all information with the same level of reliability makes the system complicated and expensive, which is not a good idea.

FIG. 5 shows a schematic configuration of a large-scale information transmission system such as a VAN which distributes information from a plurality of information sources 2a to 2m via the network 6. In the figure, the configuration other than the input / output unit 10 and the recovery unit 40 is the same as the configuration of FIG. 1, so detailed illustration is omitted.

The information transmitted from the information source is shown in FIG.
An information source ID is assigned as shown in the format of (b). The input / output unit 10 has an information accumulation determination unit 13, and a predetermined information source I of the output processing information is output.
Only the information with D is output to the storage unit and stored. The recovery means 40 determines which one of the differential serial numbers is not recoverable by itself, and notifies the information source of the retransmission request means 43.
Is equipped with.

FIG. 6 is a flow chart for explaining the processing of the recovery means 40 for recovering the missing information according to this embodiment. In step S301, a difference serial number is generated from the own system processing serial number and the other system processing serial number sent from the survival monitoring means 30, and in step S302, the differential serial number information is stored in the storage means 2.
Reads and outputs from 0. In step S303, it is determined whether the serial number information can be read, and the information source I
Regarding the information of D, in step S304, the serial number is notified to the information source and a resend is requested. From that source,
The information is retransmitted at a time when the user can perform batch processing.
For information on information source IDs that do not need to be retransmitted,
Do not request resend.

In the above example, the correspondence of the missing information recovery processing is changed by a plurality of information source IDs, but the present invention is not limited to this. An ID may be given according to the type of information such as the required reliability and priority, and the information distribution device 1 may perform recovery processing for a high type ID. In this case, the number of information sources is one or more. . Information source ID
It is also possible to combine and the information type ID.

According to the present embodiment, in a large-scale information transmission system in which a plurality of information sources or various kinds of information are mixed and transmitted, reliable real-time distribution of important information (source) can be performed easily. It can be realized by various configurations.

[0035]

According to the information delivery method of the present invention, information leakage due to switching can be immediately recovered, and the dual delivery servers are operated asynchronously with each other, so that highly reliable real-time delivery can be realized. There is.

According to the information delivery system of the present invention, the dual configured delivery server itself is provided with means for recovering information leakage due to switching, and the recovery processing is changed according to the information source and the type of information. Therefore, the configuration is simple and versatile.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an information distribution system showing a first embodiment of the present invention.

FIG. 2 is a flowchart illustrating a normal process of a distribution server.

FIG. 3 is a format showing a structure of information.

FIG. 4 is a flowchart illustrating a missing information recovery process.

FIG. 5 is a configuration diagram of an information distribution system showing a second embodiment of the present invention.

FIG. 6 is a flowchart illustrating a recovery process according to the second embodiment.

FIG. 7 is a block diagram showing a conventional information distribution device.

[Explanation of symbols]

1a, 1b ... Information distribution computer (server), 2 ... Information source,
3 ... Output line, 4 ... Switching device, 5 ... Delivery destination device (terminal), 6 ... Network, 10 ... Input / output means, 20 ... Storage means, 30 ... Survival monitoring means, 40 ... Missing information recovery means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akihiko Tobe 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika factory

Claims (8)

[Claims] 1. An information distribution method in which information having serial numbers assigned to information units is received by two distribution servers that operate asynchronously with each other, and distributed from one distribution server that is in a connected state with a distribution destination. , Both servers perform distribution processing of the received information and store it, and when the connection state with the delivery destination is switched from the one distribution server to the other distribution server, the distribution processed information by both servers The information distribution method, wherein the missing information due to switching is read out from the accumulated information and distributed by referring to the serial number. 2. An information distribution method, wherein information having serial numbers assigned to information units is received by two distribution servers that operate asynchronously with each other, and distributed from one distribution server that is in a connected state with a distribution destination. , Each of the distribution servers outputs the processing information, which has been subjected to a predetermined processing, to the delivery destination in the received information unit, accumulates the processing information, and outputs the serial number in the processing information unit. Is detected, the processed serial number of the own system is updated, and the processed serial number of the other system received by sending and receiving the processed serial number to and from the distribution server of the other system is updated and managed, and the connection with the delivery destination is established. When it is confirmed that the state is switched from the one distribution server to the other distribution server, the other distribution server compares the processed serial numbers of the managed own system and the other system and Processed serial number If so, information distribution method characterized by distributing reads information corresponding to the difference between the treated serial number of own system and other system from the processing information that the storage. 3. The information distribution method according to claim 2, wherein the confirmation of switching to the other distribution server is performed when the processed serial number from another system cannot be received within a predetermined period. 4. The information distribution method according to claim 2, wherein the processing information is accumulated while cyclically updating a predetermined number of units. 5. The information unit according to any one of claims 1 to 4, wherein an identifier (ID) indicating an information source and / or a type of information is added to the information unit received by the distribution server, An information distribution method characterized in that accumulation is performed for a predetermined identifier. 6. The method according to claim 5, wherein when the processing information corresponding to the difference between the processed serial numbers of the own system and another system is not stored, the information source is requested to retransmit the information. Information distribution method characterized by. 7. A piece of information, to which a serial number is assigned to each information unit, is received by two information distribution computers that operate asynchronously, and distributed from one information distribution computer connected to a delivery destination by a switching device to the delivery destination device. In the information distribution system described above, each of the information distribution computers includes an input / output unit that performs a predetermined input / output process for each input information unit and outputs the process information to a destination, and a storage unit that stores the process information. A monitoring means for managing the processed serial number of the processing information for the own system and another system, and confirming the switching to the own system by the switching device, and the own system and the other system output from the monitoring means. An information distribution system comprising: a missing information recovery means for taking a difference between processed serial numbers, reading processing information corresponding to the difference from the storage means, and outputting the processing information to a delivery destination. Tem. 8. Time-series information to which a serial number and an information source identifier (ID) are assigned in units of information from a plurality of information sources is received by two information distribution computers that operate asynchronously, and a destination is switched by a switching device. In the information distribution system that distributes in real time from one of the information distribution computers connected to the distribution destination device group, each of the information distribution computers performs predetermined input / output processing in input information units to process information. Input / output means for outputting to the delivery destination, accumulating means for accumulating a predetermined information source identifier of the processing information, serial number of the processing information is detected, and the detected serial number of the own system is detected by another system. Monitoring means for transmitting / receiving to / from the information distribution computer to update the processed serial numbers of the own system and other systems, and for confirming switching to the own system by the switching device, and own system and other systems output from this monitoring means Of the processed serial number, the processing information corresponding to the difference is read from the storage means and output to the delivery destination, and when the corresponding processing information is not stored in the storage means, it is retransmitted to the information source. Missing information recovery means to request,
An information distribution system comprising: