JPS59108155A - File management system of dispersion type network system - Google Patents

Abstract

PURPOSE:To change the contents of a table means indicating the existing positions of the whole files without a load to the user in a dispersion type network system by broadcasting the updata of the contents of the table means connected to each node from each node. CONSTITUTION:When a file supplying node 15 is rearranged at a file A by another file supplying node, a table managing part 17 interlocked with a file managing part 16 changes the positional information of the file A from 4 to 5 and simultaneously broadcasts a table updata message A-5 to the whole nodes having other file existing position information tables through a broadcasting controlling part 19. A retrial flag 20 of the broad-casting is set up to ''1'' at the time of broadcasting, and when a normal response is received from an objective node, the retrial flag 20 is reset. Until the normal response is obtained, the transmission of the table changing message is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a network file management method in which files managed in a distributed manner across a plurality of nodes are networked and used in a distributed network system. The present invention relates to a network file management method in which file identification information and file location information are separated, and only the file location information is updated when rearranging a file.

Technical background In general, in distributed network systems,
Files are distributed and managed on each node for efficiency and security. Then, due to changes in the processing content of users or for reasons of system management and operation, files may be relocated to other nodes that are optimal in terms of system cost or traffic distribution. For files with a large number of files, copies are often placed on other nodes.

On the other hand, the file identification information used by the user to call up a file includes information indicating the location of the file, and the network system always unifies the file identification information and the file location information. and controlled the connection between the user and the target file.

Therefore, when a file is rearranged, incorporated, or detached due to circumstances on the network system side, the file user must be notified of the change in the identification information for calling the file, and the overhead is a problem. For example, it has been impossible to dynamically rearrange the system at any time depending on the system load.

The present invention solves the drawbacks of the conventional methods described above, increases the degree of freedom for unique file rearrangement on the network system side, and eliminates the need for users to be aware of the location of files. The purpose of this invention is to improve usability by shortening the amount of operation instruction information for files.

As a configuration for that purpose, the present invention provides a distributed network system having files that are distributed and managed by multiple nodes in the system, in which each distributed management node includes location information of all files in the network. A table means is arranged, and means is provided for broadcasting to all nodes a message for registering, updating, or deleting location information by incorporating, rearranging, or detaching a file in the network, and the broadcasting means responds to the broadcast. The message is retransmitted to unconfirmed nodes at regular intervals, and each node receives the message and updates the file location information in the table means, thereby improving file management for users and the network system. The file identification information is used independently from the file location information.

Embodiment of the Invention FIG. 1 is a diagram showing an example of control operation for explaining the basic concept of the invention. In the figure, 1 is the network, 2
is a network file management area, 3 is a network file centralized management node, which manages file usage status and access request queues, 4.5.6 is a file providing node, 7.8 is a file operation node, 9 to Reference numeral 12 indicates a file location information table, 13 indicates file A, and 14 indicates file B1.

Initially, the location information of network files A and H is
Since file A was placed on node 4, (A-4)
, (B-6) are registered in Tables 9 to 12. Note that outside the network file management area (two file operation nodes 7.8 (:) indicates that the file location information table is located, file identification information A,
Only B is informed of the car.

Here, as shown in the figure (=, it is assumed that file A is relocated from file providing node 4 to node 5. Therefore, file location information (A-4).

needs to be changed to (A-5), and the file providing node 5 takes the lead in broadcasting a message representing this change information to all other nodes that have the file location information table and requesting that the table be updated. do.

At this time, if each broadcasted node successfully receives the message, it sends a normal response signal to node 5 (
Return two. However, if it is assumed that node 6 has some kind of failure or goes down, node 5 cannot receive a normal response signal from node 6.

Therefore, the node 5, for example, creates a queue 9 of nodes whose normal response has not been confirmed, and repeats message transmission to the node 6 at regular time intervals.

If the user of file node' operation A7 adjusts the location of file A to use it while node 6 has not recovered from the failure, node 7 recovers from the failure due to node 6's failure. Since the matching fails, even if the table 1z has not been significantly updated at this time, the old information will not be answered and no problem will occur. On the other hand, if the node 8 user inquires about the location of file A to node 4, the updated table 10 of node 4
Since the correct file location information is answered using , the user of node 8 can request node 5 to use file A using file identification information A even though file A has been relocated. can be produced.

In this way, file location information is compiled into a table and distributedly managed on each node, so if a particular node goes down, the entire system will not be affected, and the remaining normal files will not be affected. File usage processing can be performed using the location information. File location information is updated when cataloging/uncataloging, but this is done infrequently, and master file location information is referenced when making arrangements, but since updates are infrequent, synchronization errors can occur. The impact is of little concern.

FIG. 2 is a configuration diagram of a system according to an embodiment of the present invention. In the figure, 15 is a file providing node, 16 is a file management unit, 16α is a file A 117 is a file location information table management unit, 18 is a file location information table qltm@, x9 is 23 is a communication control unit, and 24 is a file A location information table management unit 25 indicates a file location information table.

In operation, it is assumed that the file providing node 15 has the file A relocated from another file providing node (not shown). The table management unit 17 that works in conjunction with the file management unit 16 changes the location information “4” of the file A in the table 18 to “5” as shown in the figure, and at the same time changes the location information of the file A from the table 18 to “5” as shown in the figure. A table update message (A-5) is broadcast to all nodes that hold the location information table.

The broadcast control unit 19 controls each broadcast control unit 20
is set to 11' at the time of broadcasting, and reset when a normal response is received from the target node. The table update message is sent from the communication control unit 21 to the target node 2.
The data is sent to the table management unit 24 via the communication control unit 23 of No. 2.

The table management unit 24 updates the table 25 to (A-5) and returns a response signal indicating normal completion to the node 15. When the broadcast control unit 19 receives the normal response signal, it resets the flag of the corresponding node to 20'. However, as described in Figure 1, if a failure occurs in the target node, an abnormal response will occur and the flag will be 2.
o is not reset. The broadcast control unit 19 checks the flag that continues to display 1' at regular time intervals,
The table change message is repeatedly sent to the target node until a normal response is obtained.

In this way, one node in which a file has been changed takes the initiative and automatically instructs all nodes to update the file location information table, and confirms normal completion.

Effects of the Invention According to the present invention, the network side processes changes in file location information when relocating files by automatically updating a table of the information distributed to each node. allows you to freely change the file arrangement without any burden. Furthermore, since the file location information table is distributed to each node in the network, it is possible to improve reliability against node failure and shorten the time needed to make arrangements.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of the present invention, and FIG. 2 is a configuration diagram of an embodiment system. In the figure, 1 is the network, 2 is the network file management area, 3 is the network file central management node, and 4 is the network file management area.
．． 5.6 is a file providing node, 7.8 is a file operation node, 9 to 12 are file location information tables,
13 indicates file A114 indicates file B. Patent Applicant's Representative Patent Attorney (1 person) '11''2m (Continued from page 1) Applicant: NEC Corporation, 5-33-1 Shiba, Minato-ku, Tokyo / Applicant: Hitachi, Ltd. 1-5-1 Marunouchi-chome, Chiyoda-ku, Tokyo Applicant Oki Electric Industry Co., Ltd. 1-7-12 Toranomon, Minato-ku, Tokyo

Claims (1)

[Claims] In a distributed network system having files that are managed in a multi-distributed manner across multiple nodes within the system, a table means containing location information of all files within the network is placed in each of the distributed management nodes, and files within the network are incorporated. , a means for broadcasting to all nodes a message for registering, updating, or deleting location information due to rearrangement or detachment, and the broadcasting means replays the above message at regular time intervals to nodes that have not yet confirmed a response to the broadcast. and each node receives the message and updates the file location information in the table means, so that the file identification information in the file management of the user and the network system can be used independently from the file location information. A file management method for a distributed network system that is characterized in that