JP2907968B2 - Master determination system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] Regarding a master determination system that determines a master for updating a directory, a system is provided with a plurality of DSA, a master address management table, and a user unprocessed table, and these are provided in response to a directory update request. Refers to the table, introduces the master DSA using the referral function, and in the event of a failure in the master DSA, other general DSAs are replaced, and a large amount of directory information is stored with the aim of enabling the directory function to continue permanently And a DIB (Directory Information Base) that has a master address management table that stores the address of the master DSA that updates the directory, and a user unprocessed table that stores unprocessed directory request sources, and updates this DIB DSA (Directory System) that provides services such as The DSA, which has received a directory update request from the directory request source, refers to the master address management table in the DIB and performs update when it is equal to its own address. When the directory requesting source is not stored in the user unprocessed table, the address of the master DSA extracted from the master address management table is introduced to the directory requesting source, and the directory requesting source that has been referred to receives the DSA of the referral destination. (Master DSA) makes a directory request, and on the other hand, when it is not equal and the address of the directory requester is stored in the above-mentioned user unprocessed table, the DSA of the master is regarded as having failed and the DSA of the master is regarded as having failed. Register own address in address management table and update directory Sea urchin to configure.

[Industrial applications]

The present invention relates to a master determination system that determines a master for updating a directory.

[Problems to be solved by conventional technology and invention]

Conventionally, as shown in FIG. 4, a directory (for example, information such as names in a telephone directory or a directory) includes a DSA (Directory System Agent) for providing information, and a DUA (Directory System Agent) for requesting a service on behalf of a directory user. Directory U
ser Agent). When implementing a DSA for this directory, it is conceivable to implement a DSA that performs the same function in multiple systems, taking into account the failure of the system that implements it (such as a system down). In a system in which a plurality of DSAs are implemented as described above, a DIB (Directory Information B) storing directory information is stored.
When updating ase), it is necessary to limit the number of DSAs responsible for updating to one. This DSA is called a master DSA, and updating of the DIB is performed by the master DSA. Other DSAs (commonly referred to as DSAs) have information reading-related functions (Read, S
earch, List, Compare, etc.). When a failure occurs in the master DSA, there is a problem that the general DSA cannot update the DIB and cannot function as a directory system.

The present invention provides a system with a plurality of DSAs, a master address management table, and a user unprocessed table, refers to these tables in response to a directory update request, introduces a master DSA using an introduction function, and fails the master DSA. The purpose is to allow other general DSAs to be replaced when they occur, allowing the directory function to continue forever.

[Means for solving the problem]

Means for solving the problem will be described with reference to FIG.

In FIG. 1, a DIB (directory information base) 1 stores a large number of directory information, a master address management table 1-1 for storing the address of a master DSA, and a directory for storing unprocessed directory request sources. Has a user unprocessed table 1-2.

DSA (Directory System Agent) 2
Provides services such as updating and reading of DIB1.

[Action]

In the present invention, as shown in FIG. 1, the DSA 2 that has received the directory update request from the directory
The master address management table 1-1 is updated with reference to the master address management table 1-1 when the address is equal to the own address. When the address is not equal and the directory request source is not stored in the user unprocessed table 1-2, the master address management table is updated. 1-
The address of the master DSA extracted from 1 is introduced to the directory request source 3, and the directory request source 3 receiving the request makes a directory request to the DSA (master DSA) of the referral destination. When the directory request source is stored in the processing table 1-2, it is considered that a failure has occurred in the master DSA2, and the DSA2 registers its own address in the master address management table 1-1 and updates the directory. Like that.

Therefore, the system is provided with a plurality of DSA2s, a master address management table 1-1, and a user unprocessed table 1-2. Introducing the DSA and replacing other general DSAs when a failure occurs in the master DSA makes it possible to update the directory permanently.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be sequentially described in detail with reference to FIGS.

In FIG. 1, a DIB (Directory Information Base) 1 stores a large number of directories (information such as names and occupations of a telephone directory and a directory), and
Master address management table 1-1 for storing the addresses of two master DSAs and an unprocessed directory request source 3
Has a user unprocessed table 1-2 for storing the address of the user.

The master address management table 1-1 stores a DSA (master DSA) for updating the directory of DIB1 among the plurality of DSAs2.
2) (P address, system address, for example, A, B, C, etc.)
It can be operated from all DSA2.

The user unprocessed table 1-2 is a table for registering the address (P address, system address, for example, 001, 002, etc.) of the unprocessed directory request source 3 in the directory update request from the directory request source 3. And can be operated from all DSA2.

DSA (Directory System Agent) 2
The DSA provides services such as updating and reading of the DIB1, and performs data exchange with the directory request source 3, and performs processing such as updating and reading of the DIB1.
It is composed of a protocol processing unit 2-1, a master management processing unit 2-2 for replacing and introducing masters, and the like. An address (P address, system address) is assigned to DSA2, for example, A, B, C, etc., and is registered in the master address management table 1-1 to register the master DSA. An address (for example, address A) is returned to notify the master DSA.

The directory request source 3 is a DUA (Directory User Agent), a terminal or a workstation for notifying the user of a directory request from the user to the DSA 2 or displaying the service returned from the DSA 2 to the user. And so on. In the directory request source 3, the address (P address, system address) is, for example, 001, 002.
The data is transferred based on this.

Next, according to the order shown in the flowchart of FIG.
The operation of the diagram configuration will be described in detail.

In FIG. 2, the master address management table 1-1 and the user unprocessed table 1-2 are checked. In response to the directory request from the directory request source (DUA) 3, the requested DSA 2 checks the master address management table 1-1 and the user unprocessed table 1-2 in the DIB 1.

Determines whether the contents of the master address management table 1-1 are the same as its own P address. If they are the same, their own DSA2 is found to be the master DSA, so DIB1
Is updated, all the contents are cleared in the list of the user unprocessed table 1-2, and the updated result is returned to the directory request source 3. On the other hand, if they are different,
Since DSA2 was found not to be the master DSA, do so.

Determines whether the P address of the directory request source 3 is in the list of the user unprocessed table 1-2. This is because the master management processing unit 2-2 of the DSA 2 that has received the directory request determines whether the P address of the directory request source 3 is in the list of the user unprocessed table 1-2, that is, updates the directory, etc. It is determined whether or not the P address of the unprocessed directory request source 3 is still registered. In the case of “Yes”, it is determined that some failure has occurred in the master DSA 2 and the directory cannot be updated to clear from the user unprocessed table 1-2. Change the address (change own DSA2 to master DSA) and update the directory requested to DIB1. Then, all the user unprocessed tables 1-1 are cleared. As a result, the replacement of the master DSA is automatically performed.

On the other hand, if it is not, then its own DSA2 is the master
Since it is determined that it is not a DSA, the P address of the directory request source is added to the list of the user unprocessed table 1-2 at, and the introduction returns the P address of the master DSA to the directory request source 3 at. The directory request source 3 that has received the return of the P address of the master DSA
Make a directory update request to DSA2 at P address of A,
, Same, and update the directory.

As described above, in response to the directory update request from the directory request source 3, the DSA 2 that has received the request
Referring to the master address management table 1-1 and the user unprocessed table 1-2 in B1, the directory is updated when it is determined that it is the master DSA.
When it is determined that the master DSA has failed and is not A, it becomes the master DSA and performs directory update (by replacing the master DSA), while itself becomes the master DSA.
When the master DSA is found not to have failed and the master DSA has failed, the master DSA is automatically replaced when the master DSA fails by introducing the master DSA and updating the directory. It is possible to introduce a master DSA when is not the master DSA, and to build a system that permanently updates the directory while maintaining the standard DIB1 configuration.

 Next, the operation will be schematically described with reference to FIG.

FIG. 3 (a) shows a normal case. here,
A DUA (directory request source) requests a directory update request to a general DSA (non-updatable).

Is a general DS that has received a directory update request
A refers to the control information (master address management table 1-1 and user unprocessed table 1-2) and determines that updating is not possible.

Returns a Referral (introduction) in response to the general DSA determining that the directory cannot be updated (using the introduction function and returning the P address of the master DSA).

Sends a directory update request to the master DSA having the P address to which the DUA has been returned.

Is the master that received the directory update request
The DSA refers to the control information (master address management table 1-1 and user unprocessed table 1-2), determines that updating is possible, and updates the corresponding directory of DIB1.

Sends back to the DUA that the directory has been updated.

Through the above procedure, the DUA can update the directory using the introduction function.

FIG. 3 (b) shows the case of a master DSA failure. Here, the DUA (directory request source) requests a directory update request to a general DSA (update not possible).

Is a general DS that has received a directory update request
A refers to the control information (master address management table 1-1 and user unprocessed table 1-2) and determines that updating is not possible.

Returns a Referral (introduction) in response to the general DSA determining that the directory cannot be updated (using the introduction function and returning the P address of the master DSA).

Sends a directory update request to the master DSA having the P address to which the DUA has been returned.

Is the master DSA that made the directory update request in
Response from the master DSA
It is determined that some trouble has occurred.

 The DUA makes a directory update request to the general DSA.

Is the same as that of the general DSA, the control information (master address management table 1-1 and user unprocessed table 1-
Referring to 2), it is determined that updating is not possible. However, in this case, it is determined that "existing" in FIG. 2 has been described, and the general DSA registers its own P address in the master address management table 1-1 and performs master replacement. And updates itself to the master DSA.

 Sends the update completion to DUA.

As described above, when a failure occurs in one master DSA and the directory cannot be updated, any other general DSA is replaced and becomes the master DSA, and the directory is updated.

〔The invention's effect〕

As described above, according to the present invention, a plurality of DSA2s, a master address management table 1-1, and a user unprocessed table 1-2 are provided in a system, and these are provided in response to a directory update request from a user. Browse the table,
Introducing the master DSA using the introduction function, and adopting a configuration in which another general DSA is replaced when a failure occurs in the master DSA, the directory of DIB1 can be updated permanently.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of the present invention, FIG. 2 is a flowchart for explaining the operation of the present invention, FIG.
FIG. 4 shows a configuration diagram of a conventional directory system. In the figure, 1 is a DIB (Directory Information Base), 1-1 is a master address management table, 1
-2 indicates a user unprocessed table, 2 indicates a DSA (directory system agent), 2-1 indicates a DSA protocol processing unit, 2-2 indicates a master management processing unit, and 3 indicates a directory request source (DUA).

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 12/00

Claims (2)

(57) [Claims] 1. A master determination system for determining a master for updating a directory, comprising: a directory request source for requesting the master to update the directory; a master address management table for storing an address of the master for updating the directory; When a user unprocessed table storing the address of the directory request source and a directory update request from the directory request source are received, updating is performed when the address is equal to its own address by referring to the master address management table and the user is updated. Clears the unprocessed table, introduces the address of another master retrieved from the master address management table to the directory request source when the directory request source is not equal and the user unprocessed table is not stored in the user unprocessed table, and processing Master determination system characterized in that it is constituted from the master register the directory request source Buru. 2. When the directory request source requests a directory update from another master introduced by the master,
When a response from another master is monitored and there is no response for a predetermined time, a directory update is requested to the master. When the master receives a directory update request from the directory request source, the master refers to the address management table. When the address is not equal to the own address and the address of the directory request source is stored in the user unprocessed table, the own address is registered and updated in the master address management table, and the user unprocessed table is updated. Master decision system characterized by clearing.