JP2010020478A - Load distribution system, entrance system, and load distribution method - Google Patents

Abstract

In a video collaboration service providing system, a load distribution system, an entrance system, and a load distribution method capable of distributing an access concentration load are provided.
Client terminals 30-1 to 30-n transmit server determination requests including priority identification information to entrance servers 10-1 to 10-m, and a service management server 40 corresponds to the priority identification information. Priority information is stored, and the bandwidth management server 20 acquires access load information of the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k, and the entrance servers 10-1 to 10-1 The data control system 4 by the client terminals 30-1 to 30-n 10-m based on the priority information corresponding to the priority identification information received from the client terminals 30-1 to 30-n and the access load information. Access control processing is performed.
[Selection] Figure 1

Description

  The present invention relates to a load distribution system, an entrance system, and a load distribution method for controlling access load concentration in data transmission / reception between a plurality of users and a server via a network.

In recent years, when viewing a video file shared via a network, there is a video collaboration in which text communication such as chat is performed by a plurality of users in accordance with the time axis of the same video file (for example, Non-Patent Document 1, Non-Patent Document 1). Reference 2).
Wikipedia, [online], [June 5, 2008], Internet <URL: http: //en.wikipedia.org/wiki/YouTube> Wikipedia, [online], [June 5, 2008], Internet <URL: http: //en.wikipedia.org/wiki/Nico Nico Douga>

  However, when performing the video collaboration of Non-Patent Documents 1 and 2, the video file has a larger data capacity per file than a text file or a still image file. Therefore, there is a problem that the load on the network for transmission / reception of moving image files is increased due to the pressure on the network and the concentration of access to various devices, resulting in a decrease in overall service quality.

  The present invention has been made in view of such circumstances and has been made to solve the above-described problems. The object of the present invention is to provide a load distribution system and an entrance that can distribute the load of access concentration in a video collaboration service providing system. A system and a load balancing method are provided.

  In order to solve the above problems, the present invention is connected to a client terminal, a data control system that performs data write processing and read processing in response to a data access request from the client terminal, and the data control system. A load distribution system connected to an entrance system via a network, wherein the data control system stores a master storage device that stores master data, and either copy data or update data of the master data A slave storage device that performs update data write processing or copy data read processing to the slave storage device in response to a data access request received from the client terminal. A response server that responds to the sender of the request In response to a response server determination request received from the client terminal, and a bandwidth management server that acquires access load information for each of the response servers included in the data control system, An entrance server that selects one of the plurality of response servers as a response server that receives the data access request from the client terminal, based on the access load information acquired by the bandwidth management server; The load comprising: a communication unit that transmits the response server determination request to the entrance server of the entrance system and transmits a data access request to the response server determined by the entrance server. A distributed system

  In the load distribution system of the present invention, destination information of the response server determination request transmitted by the client terminal includes address information of an entrance server and priority identification information indicating an access priority, and the entrance server The access control processing is performed for each access priority according to priority identification information included in the destination information of the response server determination request transmitted by the client terminal.

  In the load distribution system of the present invention, the entrance server calculates the total access load amount of the entire data control system based on the access load information for each response server acquired by the bandwidth management server, and calculates the calculated total access An access control process set in accordance with the load amount is performed.

  In the load distribution system according to the present invention, the access control process by the entrance server may be any one or a combination of access permission, denial, and bandwidth reservation amount for the data control system that is predetermined for each access priority. It is the process which determines.

  In the load distribution system of the present invention, the entrance system includes a plurality of the entrance servers to which common address information is assigned, and any one of the plurality of entrance servers transmits the response transmitted by the client terminal. A server determination request is received.

  In the load distribution system of the present invention, the plurality of slave storage devices include a download slave storage device that stores the copy data of the master data and an upload storage device that stores update data. Is connected to the master storage device, and includes a storage device control server that performs a data write control process to the connected master storage device, and the storage device control server updates the data according to the presence or absence of data access in the master storage device. Upload whether to write new update data stored in the upload storage device to the master storage device and output an update notification when it is determined whether data can be written and update data can be written Update notification output by the control unit and the upload control unit Based on whether or not the download slave storage device has data access, it is determined whether or not update data can be written. If it is determined that update data can be written, the update data is stored in the download slave storage. And a download control unit configured to reflect the update in the download slave storage device by writing to the device.

  The present invention is connected to a data control system including a client terminal, a plurality of response servers that perform data write processing and data read processing on a storage device in response to a data access request from the client terminal, and the data control system An entrance system in a load distribution system connected to an entrance system via a network, the bandwidth management server acquiring access load information for each of the plurality of response servers included in the data control system, and receiving from the client terminal Based on the access load information acquired by the bandwidth management server in response to a response server determination request, one of the plurality of response servers is selected as a response server that receives the data access request from the client terminal. Do A entrance system characterized by comprising a down transformer for the server.

  In the entrance system of the present invention, the entrance server performs access control processing for each access priority according to priority identification information included in destination information of the response server determination request transmitted by the client terminal. Features.

  In the entrance system of the present invention, the entrance server calculates an overall access load amount of the entire data control system based on access load information for each response server acquired by the bandwidth management server, and calculates the calculated overall access load. An access control process set according to the amount is performed.

  The present invention is connected to a data control system including a client terminal, a plurality of response servers that perform data write processing and data read processing on a storage device in response to a data access request from the client terminal, and the data control system A load distribution method in a load distribution system connected to an entrance system via a network, wherein the entrance system acquires access load information for each of the plurality of response servers included in the data control system. A response server determination request receiving process for receiving a response server determination request from the client terminal, and based on the access load information acquired according to the received response server determination request, which one of the plurality of response servers Or 1 A server determination process for selecting as a response server for receiving the data access request from the client terminal, and a response process for responding a determination result to the client terminal. The client terminal sends the response server determination request to the entrance system. A response server determination request transmission process for transmitting to the server, and a data access request transmission process for transmitting a data access request to the response server corresponding to the determination result by the entrance server in response to the transmitted response server determination request. This is a characteristic load balancing method.

According to the present invention, the entrance system performs data read / write processing on a plurality of slave storage devices that store copy data of master data or update data in response to an access request from a client terminal, Access load information for each of a plurality of response servers that respond to execution results is acquired, and based on this access load information, one of the plurality of response servers is determined as the access destination of the client terminal.
Thereby, there is an effect that the access load for each response server can be made uniform.

Further, according to the present invention, the destination information of the response server determination request transmitted by the client terminal includes the priority identification information indicating the priority, and the entrance system uses the priority identification information included in the destination information based on the priority identification information. Added access control processing from the terminal.
Accordingly, there is an effect that it is possible to easily perform access restriction according to the priority of the access right between the client terminals based on the destination information without using user identification information or a password.

Further, according to the present invention, the entrance system calculates the total access load information of the entire data control system based on the access load information for each response server, and accesses for each priority based on the calculated total access load information. Control processing was performed.
As a result, it is possible to perform access control processing according to the access load of the entire data control system, not to each response server, and even when the entire data control system is in a high load state, There is an effect that it becomes possible to provide a service by the response server.

According to the present invention, the entrance system includes a plurality of entrance servers to which the same destination information is assigned, and any one of the plurality of entrance servers receives a response server determination request from a client terminal. I made it.
As a result, there is an effect that it is possible to distribute the load caused by concentration of access to the entrance server.

Further, according to the present invention, the data control system includes a download slave storage device and an upload slave storage device. When it is determined that the master storage device can be written, the update data of the upload slave storage device is mastered. A storage device control server that reflects the update of the master storage device by writing the update data to the download slave storage device when it is determined that writing to the storage device, updating the master data, and writing to the download slave storage device is possible I was prepared to.
As a result, in a data control system having a plurality of slave storage devices, it is possible to perform exclusive control of data writing and reading processing.

The present invention relates to a video collaboration in which sound is blown in accordance with the reproduction of a moving image file, or the blown-in sound is reproduced and collaboration between network users can be performed. Here, first, the concept of the video collaboration assumed in the present invention will be described using a comparison between viewing on television and viewing on concert.
The television broadcast viewing is for receiving the broadcast content (content) distributed from the television station, and for the end user to view and enjoy the content by playing the received video and sound on the television. At this time, the end user only appreciates the content, and cannot transmit the sound or action that the end user himself / herself utters when viewing the content to other end users who are simultaneously viewing the same content in another location. .

On the other hand, in viewing a concert, for example, in a live concert, the content viewer (customer) not only enjoys viewing the content by the content provider (performer), but the content provider and the content viewer are integrated. As a result, a shared feeling of enjoying the content is provided.
Therefore, when viewing concert content on a television, end users are provided with a means of viewing the content of the concert, but they do not provide the shared feeling provided to the content viewers at the actual concert venue. It becomes.

  The present invention relates to control of congestion that occurs when, for example, a feeling of sharing as provided at a concert venue is provided to an end user who views content by sharing audio generated by a plurality of users for each content. Hereinafter, audio sharing for the above-described content in the present invention will be described as video collaboration or audio sharing.

Hereinafter, a load distribution system 1 according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a load distribution system 1 according to the present embodiment. The load distribution system 1 is a DNS (Domain Name System) that responds to client terminals 30-1 to 30-n as moving image playback and audio capturing devices connected via the network 100 and an IP address corresponding to the URL. DNS device 50 and a video collaboration providing system 2 that provides a content distribution service using video and audio. The network 100 includes a public network such as a fixed telephone network, a mobile phone network, and the Internet, and a private network such as a LAN (Local Area Network) and a dedicated line.

  In the figure, a client terminal 30-1 is a computer terminal such as a personal computer, PDA (Personal Digital Assistants: information portable terminal), mobile phone, etc., and is downloaded (received) from the video collaboration providing system 2 via the network 100. ) Client APL 31 as an application (hereinafter referred to as “APL”) that accepts the reproduction of the content to be played and the audio input from the user at the time of content reproduction and uploads (transmits) the received audio to the video collaboration providing system 2 -1. The client terminals 30-1 to 30-n have the same configuration.

  The client APLs 31-1 to 31-n should access a URL (Uniform Resource Locator) that is destination information to be accessed, for example, URL “http://www.hoge.com/test.html”. Extract the server host name "hoge.com". Further, the client APLs 31-1 to 31-n transmit an IP address inquiry request corresponding to the extracted host name to the DNS device 50 and receive a response from the DNS device 50.

The video collaboration providing system 2 includes an entrance system 3 as an access control device from the client terminals 30-1 to 30-n, a data control system 4 that transmits and receives content to be provided to the client terminals 30-1 to 30-n, Is provided.
In the video collaboration providing system 2, the data control system 4 includes a download server 60-1 to 60-j, a download secondary storage device slave 75-1 to 75-j, a download control device 700, and a download second. Secondary storage device master 70, upload servers 80-1 to 80-k, upload secondary storage device slaves 95-1 to 95-k, upload control device 900, and upload secondary storage device master 90 Is provided.

In the data control system 4, the secondary storage device master 70 for download stores master data. The secondary storage device slave for download 75-J (where J = 1, 2,..., J) is connected to the secondary storage device master for download 70 via the download control device 700, and the secondary storage device for download. The copy data of the master data stored in the storage device master 70 is stored.
In response to the update request, the download control device 700 updates the master data stored in the download secondary storage device master 70, or the download secondary storage device slave 75-J during the update processing. Reflect the update of the master data.

The download server 60-J is connected to the download secondary storage device slave 75-J in a one-to-one correspondence, and the own device responds to an access request received from the client terminals 30-1 to 30-n. Data is read from the connected download secondary storage device slave 75-J, and the read data is returned to the client terminals 30-1 to 30-n.
Similarly, the upload server 80-K (where K = 1, 2,..., K) is connected to the upload secondary storage device slave 95-K in a one-to-one correspondence, and the client terminal 30 In response to the access request received from -1 to 30-n, the received audio data is written as update data in the upload secondary storage device slave 95-K to which the own device is connected.

The upload control device 900 reads update data of the upload secondary storage device slaves 95-1 to 95-k at a predetermined cycle, writes the update data to the upload secondary storage device master 90, and uploads the written update data for upload. Clearing (data erasing) is performed in the secondary storage slaves 95-1 to 95-k.
In addition, the upload control apparatus 900 outputs an update request including update data to the download control apparatus 700.
On the other hand, in the video collaboration providing system 2, the entrance system 3 includes entrance servers 10-1 to 10-m, a bandwidth management server 20, and a service management server 40.

  The bandwidth management server 20 is connected to the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k included in the data control system 4, and transmits a use bandwidth request, respectively. The access load information indicating the bandwidth usage status for each device returned from the download server 60-J and the upload server 80-K is acquired. Note that the access load information includes, for example, a ratio “100 × (( Data amount actually communicated during one cycle) / (data amount communicable during one cycle)).

  The service management server 40 previously stores a priority information table in which priority information for each priority identification information included in a URL that is destination information of response server determination requests transmitted by the client terminals 30-1 to 30-n is associated. I remember it. Here, the priority identification information is represented by a character string such as “abcdefghijk” below the host name in the URL “http://www.hoge.com/abcdefghijk”, for example. For example, a priority A that always permits access, a priority B that denies access at a fixed rate according to the access load, and a priority C that denies uniform access when the access load is high. Three types of priority will be described as an example.

  Each of the entrance servers 10-1 to 10-m is assigned the same host name “hoge.com”, and the bandwidth is determined according to the response server determination request received from the client terminals 30-1 to 30-n. Access load information is acquired from the management server 20, and priority information is read from the service management server 40 using the priority identification information included in the response server determination request as a search key. Based on the priority information and the access load information, the entrance servers 10-1 to 10-m determine a response server that is an access request target of the client terminals 30-1 to 30-n, and the determination result is the client terminal. Responds to 30-1 to 30-n.

  The DNS device 50 stores the IP addresses of the entrance servers 10-1 to 10-m in an internal database as IP addresses corresponding to the host name “hoge.com” in advance, and the host name “hoge.com”. When an IP address inquiry request for “com” is received from the client APLs 31-1 to 31 -n, any of the IP addresses of the entrance servers 10-1 to 10 -m is randomly selected by, for example, the DNS round robin method. The selected IP address is returned to the IP address inquiry request source.

Next, the internal configuration of each device will be described. FIG. 2 is a block diagram illustrating a configuration of the entrance server 10-M. The entrance server 10 -M includes a control unit 11, a communication unit 12, a bandwidth usage rate calculation unit 13, a URL determination unit 14, and a connection control unit 15.
The control unit 11 controls each unit of the entrance server 10-M. The communication unit 12 transmits and receives signals between the bandwidth management server 20, the service management server 40, and the client terminals 30-1 to 30-n.

Based on the access load information for each device of the download server 60-J and the upload server 80-K received from the bandwidth management server 20, the bandwidth usage rate calculation unit 13 accesses the access load of the entire data control system 4 (for example, , The total available bandwidth) is calculated and output to the connection control unit 15.
The URL determination unit 14 reads the corresponding priority information from the service management server 40 by using the priority identification information included in the URL information received from the client terminals 30-1 to 30-n as a search key, so that the client terminal 30 The priority of −1 to 30-n is determined, and the determination result is output to the connection control unit 15.

  The connection control unit 15 uses the client terminals 30-1 to 30-30 based on the information on the free bandwidth of the entire data control system 4 input from the bandwidth usage rate calculation unit 13 and the priority information input from the URL determination unit 14. -N determines the available servers, and notifies the determination results to the terminals 30-1 to 30-n via the client communication unit 12.

  Here, the determination method in the connection control unit 15 is, for example, when there is a sufficient free bandwidth in the entire data control system 4 and access control such as access restriction becomes unnecessary, regardless of the priority. The download server 60-J (or the upload server 80-K) having a high free bandwidth ratio is determined as the use server of the client terminals 30-1 to 30-n. When the entire available bandwidth E of the data control system 4 falls within the predetermined range “X> E> Y> 0”, the connection control unit 15 determines the access request corresponding to the priority A according to the priority information. Are permitted, access requests corresponding to priority B are rejected at a predetermined rate x (0 <x <1), and access requests corresponding to priority C are rejected.

Here, the access request rejection means that the connection control unit 15 sends a response to notify that the access request is rejected instead of the notification of the available server, to the client terminals 30-1 to 30-30 as the transmission source of the server determination request. -Send to n.
When the entire available bandwidth E of the data control system 4 falls within a predetermined range “X> Y ≧ E ≧ 0”, the connection control unit 15 determines the access request corresponding to the priority A according to the priority information. Only access requests corresponding to the priorities B and C are rejected.

  Next, the internal configuration of the bandwidth management server 20 will be described with reference to FIG. FIG. 3 is a block diagram showing the internal configuration of the bandwidth management server 20. In the figure, the bandwidth management server 20 includes a control unit 21, a communication unit 22, a usage information acquisition unit 23, and a bandwidth management notation unit 25. The control unit 21 controls each unit included in the bandwidth management server 20. The communication unit 22 is connected to the entrance servers 10-1 to 10-m, the download servers 60-1 to 60-j, and the upload servers 80-1 to 80-k. Send and receive.

The usage information acquisition unit 23 requests access load information from the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k and responds from each device. And the acquired access load information is written in the bandwidth management notation unit 25.
The bandwidth management notation unit 25 uses the access load information associated with the identification information for each of the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k as a table format bandwidth management table. Remember.

Next, the internal configuration of the service management server 40 will be described with reference to FIG. FIG. 4 is a block diagram showing the internal configuration of the service management server 40.
The service management server 40 includes a control unit 41, a communication unit 42, and a priority URL storage unit 43. The control unit 41 controls each unit of the service management server 40 and searches for priority information from the priority URL storage unit 43 in response to a priority search request from the entrance servers 10-1 to 10-m. The communication unit 42 is connected to the entrance servers 10-1 to 10-m and transmits / receives data to / from the entrance servers 10-1 to 10-m. The priority URL storage unit 43 stores a priority information table in a table format in which priority identification information included in a URL is associated with priority information.

Next, the operation of the video collaboration providing system 2 of the load distribution system 1 according to an embodiment of the present invention will be described.
FIG. 5 is a flowchart showing a flow of processing in which the entrance server 10 -M acquires access load information from the bandwidth management server 20.
When receiving the response server determination request from the client terminal 30-N, the entrance server 10-M (where M = 1, 2,..., M) transmits an access load information transmission request to the bandwidth management server 20. (Step S1). In response to the access load information transmission request, the bandwidth management server 20 transmits an access load information notification request to all of the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k. (Step S2).

Each of the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k calculates, for example, the current communication bandwidth usage rate (step S3), and the calculation result and identification of the own device. The access load information including the information is transmitted to the bandwidth management server 20 (step S4).
The bandwidth management server 20 updates the bandwidth management table of the bandwidth management notation unit 25 based on the received access load information (step S5), and responds to the entrance server 10-M using the updated bandwidth management table as access load information. (Step S6).

FIG. 6 is a diagram illustrating a flow of processing in which the entrance servers 10-1 to 10-m acquire priority information from the service management server 40.
The entrance server 10-M sends priority information notification including the priority identification information of the URL included in the response server determination request received from the client terminal 30-N (where N = 1, 2,..., N). The request is transmitted to the service management server 40 (step S11). The service management server 40 reads the priority information from the priority URL storage unit 43 using the priority identification information of the received priority information notification request as a search key (step S12), and uses the read priority information as the entrance server 10-. Responds to M (step S13).

Next, a processing flow of the load distribution system 1 when the client terminal 30-N requests service provision from the video collaboration provision system 2 will be described with reference to FIG.
As a URL for the user operating the client terminal 30-N or the client APL 31-N of the client terminal 30-N to receive provision of the video collaboration service, the host name of the entrance server 10-M, priority information, URLs including are acquired in advance. The client terminal 30-N transmits an IP address inquiry request including the host name of the acquired URL to the DNS device 50 (step S21).

The DNS device 50 selects any IP address (here, for example, the IP address of the entrance server 10-M) among the entrance servers 10-1 to 10-m by DNS round robin (step S22). ), And responds to the client terminal 30-N (step S23).
The client terminal 30-N transmits a response server determination request including the acquired URL to the entrance server 10-M corresponding to the IP address acquired from the DNS device 50 (step S24).

The entrance server 10-M transmits an access load information acquisition request to the bandwidth management server 20 and acquires the access load information from the bandwidth management server 20, thereby calculating the free bandwidth ratio of the entire data control system 4 (step S25).
Next, the entrance server 10-M transmits a priority information notification request including the priority identification information of the URL included in the received response server determination request to the service management server 40, and acquires the priority information (step). S26).

As described above, the entrance server 10-M performs an access restriction process based on the priority information and the free bandwidth ratio of the entire data control system 4 (step S27). If the determination result is that access is denied, a response signal notifying access denial is sent to the client terminal 30-N (step S28).
When the access is permitted and the available server is notified, the client terminal 30-N makes an access request to the notified server device (in this case, either the download server 60-J or the upload server 80-K). And the provision of the video collaboration service by the data control system 4 is received (step S29).
Further, the entrance server 10-M outputs to the bandwidth management server 20 an update of the free bandwidth of the server permitted to be used by the client terminal 30-N (step S30).

Next, the flow of a process of writing upload data such as voice data transmitted from the client terminals 30-1 to 30-n to the secondary storage device slaves 95-1 to 95-k for upload will be described. FIG. 8 is a flowchart showing the flow of data write processing in the data control system 4.
Upon receiving an access request for uploading data such as voice data from the client terminals 30-1 to 30-n, the upload server 80-K uses the received data as update data to upload the secondary storage device slave 95- Write to K (step S31).

  The upload control device 900 reads the update data from the upload secondary storage device slaves 95-1 to 95-k at predetermined intervals (step S32), and writes the data to the upload secondary storage device master 90. Then, an exclusive control process for restricting simultaneous access to the same memory area is performed according to the presence or absence of other access processes (step S33).

The upload control device 900 acquires the access load information from the secondary storage device master 90 for upload to the secondary storage device master 90 for upload (step S34). The next storage device master 90 is written (step S35).
When the update control device 900 finishes writing the update data, the upload control device 900 releases the exclusive control for the memory area (step S36), and transmits a notification of the update data including the update data to the download control device 700 (step S37).

Next, the flow of processing for updating the data of the secondary storage device master 70 for download and the secondary storage device slaves 75-1 to 75-j for download in accordance with the data update of the secondary storage device master 90 for upload. explain. FIG. 9 is a flowchart showing a data update process flow of the download secondary storage device master 70 and the download secondary storage device slaves 75-1 to 75-j in the data control system 4.
As shown in step S37 of FIG. 8, when the upload control apparatus 900 transmits a notification of update data to the download control apparatus 700, the download control apparatus 700 writes the update data in the download secondary storage master 70 (step S41). ).

Next, the download control device 700 performs exclusive control processing for restricting simultaneous access to the same memory area for the update data write to the download secondary storage device slaves 75-1 to 75-j. Update data is written to the secondary storage slaves 75-1 to 75-j for download (step S42).
On the other hand, when the download server 60-J receives an access request from the client terminal 30-N (step S43), data corresponding to the access request is read from the download secondary storage device slave 75-J, and the client terminal 30 Responds to -N (step S44).

  According to the above-described embodiment, the bandwidth management server 20 of the entrance system 3 obtains access load information for each of the download servers 60-1 to 60-j and the upload servers 80-1 to 80-k as response servers. Based on this access load information, the entrance servers 10-1 to 10-m determine one of the plurality of response servers as the access destination of the client terminals 30-1 to 30-n. This has the effect of making it possible to equalize the access load for each response server.

Further, according to the priority identification information included in the URL of the response server determination request transmitted by the client terminals 30-1 to 30-n, the entrance servers 10-1 to 10-m are connected to the client terminals 30-1 to 30-30. -N priority information is acquired from the service management server 40, and an access control process is performed based on the priority.
As a result, the video collaboration providing system 2 can easily perform access restriction according to the priority of the access right between the client terminals based on the URL without using user identification information or a password. is there.

Further, the entrance servers 10-1 to 10-m calculate the total access load information of the entire data control system 4 based on the access load information for each response server, and based on the calculated total access load information, the priority level is calculated. Access control processing was performed every time.
As a result, it is possible to perform access control processing according to the access load of the entire data control system 4 instead of each response server, and even when the entire data control system 4 is in a high load state, an access request with a high priority is made. On the other hand, there is an effect that it becomes possible to provide a service by the response server.

  The entrance system 3 includes a plurality of entrance servers 10-1 to 10-m to which the same host name is assigned, and any one of the entrance servers 10-1 to 10-m is a client terminal 30-. Response server determination requests from 1 to 30-n are received. Thereby, there is an effect that it is possible to distribute the load due to the concentration of access to the entrance servers 10-1 to 10-m.

  The access load distribution method for the entrance servers 10-1 to 10-m has been described by the method using the DNS round robin method of the DNS device 50. However, the method is not limited to this, and a plurality of IP addresses are assigned to one domain name. Any load distribution method can be applied as long as it is a load distribution method for assigning.

  The client terminals 30-1 to 30-n, the entrance servers 10-1 to 10-m, the bandwidth management server 20, the service management server 40, the DNS device 50, the download servers 60-1 to 60-j, The upload servers 80-1 to 80-k, the download control device 700, and the upload control device 900 have a computer system therein. The client APLs 31-1 to 31-n of the client terminals 30-1 to 30-n, the control unit 11 of the entrance servers 10-1 to 10-m, the communication unit 12, the bandwidth usage rate calculation unit 13, and the URL determination unit 14, connection control unit 15, control unit 21 of bandwidth management server 20, communication unit 22, usage information acquisition unit 23, bandwidth management notation unit 25, control unit 41 of service management server 40, communication unit 42, priority URL storage unit 43, the download servers 60-1 to 60-j, the upload servers 80-1 to 80-k, the download control device 700, and the upload control device 900 are operated on a computer-readable recording medium in the form of a program. The above processing is performed when the computer system reads and executes this program.The “computer system” herein includes a CPU, various memories, an OS, and hardware such as peripheral devices.

Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.
Further, a program for realizing each step shown in FIGS. 5, 6, 7, 8, and 9 is recorded on a computer-readable recording medium, and the entrance servers 10-1 to 10-m shown in FIG. Is recorded on a computer-readable recording medium, and the program for realizing the function of the processing unit in the bandwidth management server 20 shown in FIG. A program for recording on a medium and for realizing the function of the processing unit in the service management server 40 shown in FIG. 4 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is stored in a computer system. By loading and executing, the load on the video collaboration service providing system The distributed processing may be performed.
The “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a CD-ROM, a hard disk built in a computer system, etc. This is a storage device.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

1 is a block diagram illustrating an overall configuration of a load distribution system 1 according to an embodiment of the present invention. It is a block diagram which shows the internal structure of the server 10-M for entrances in the same embodiment. It is a block diagram which shows the internal structure of the bandwidth management server 20 in the same embodiment. It is a block diagram which shows the internal structure of the service management server 40 in the embodiment. 6 is a flowchart showing a flow of processing in which the entrance server 10-M in the embodiment acquires access load information from the bandwidth management server 20. FIG. 5 is a flowchart showing a flow of processing in which the entrance server 10-M in the embodiment acquires priority information from the service management server 40. FIG. It is a figure which shows the flow of a process when the client terminal 30-N in the same embodiment requests | requires service provision to the moving image collaboration provision system 2. FIG. It is a figure which shows the flow of a process when the client terminal 30-N in the same embodiment uploads data to the server 80-K for upload. It is a figure which shows the flow of the data update process of the secondary storage apparatus master 70 for download and the secondary storage apparatus slave 75-J for download in the embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Load distribution system 2 Animation collaboration provision system 3 Entrance system 4 Data control system 100 Network 30-1 to 30-n Client terminal 31-1 to 31-n Client APL
10-1 to 10-m Entrance server 60-1 to 60-j Download server 75-1 to 75-j Secondary storage device slave for download 700 Download control device 70 Secondary storage device master for download 80-1 80-k upload server 95-1 to 95-k upload secondary storage device slave 900 upload control device 90 upload secondary storage device master 20 bandwidth management server 40 service management server 50 DNS device 11 control unit 12 communication unit 13 Bandwidth usage rate calculation unit 14 URL determination unit 15 Connection control unit 21 Control unit 22 Communication unit 23 Usage information acquisition unit 25 Band management notation billion unit 41 Control unit 42 Communication unit 43 Priority URL storage unit

Claims (10)

A load connecting a client terminal, a data control system that performs data write processing and read processing in response to a data access request from the client terminal, and an entrance system connected to the data control system via a network A distributed system,
The data control system includes:
A master storage device for storing master data;
A slave storage device that stores either copy data of the master data or update data, and an update to the slave storage device connected to the slave storage device in response to a data access request received from the client terminal A plurality of combinations with a response server that performs data write processing or copy data read processing and responds to the transmission source of the data access request,
The entrance system is
A bandwidth management server for acquiring access load information for each of the plurality of response servers included in the data control system;
Based on the access load information acquired by the bandwidth management server in response to a response server determination request received from the client terminal, one of the plurality of response servers is set as the data access request from the client terminal. And an entrance server to select as a response server that accepts
The client terminal is
A load distribution system comprising: a communication unit that transmits the response server determination request to the entrance server of the entrance system, and transmits a data access request to the response server determined by the entrance server. The destination information of the response server determination request transmitted by the client terminal is:
Including address information of the entrance server and priority identification information indicating the access priority,
The entrance server is
The load distribution system according to claim 1, wherein an access control process with an access priority according to the priority identification information is performed. The entrance server is
Based on the access load information for each response server acquired by the bandwidth management server, the entire access load amount of the entire data control system is calculated, and the access control process set corresponding to the calculated total access load amount is performed. The load distribution system according to claim 2. The access control processing by the entrance server is:
The load distribution system according to claim 2, wherein the load distribution system is a process for determining whether to permit or deny access to the data control system determined in advance for each access priority. The entrance system is
A plurality of entrance servers to which common address information is assigned;
5. The load distribution system according to claim 1, wherein any one of the plurality of entrance servers receives the response server determination request transmitted by the client terminal. The plurality of slave storage devices are:
A download slave storage device that stores the copy data of the master data, and an upload storage device that stores update data;
The data control system includes:
A storage device control server for connecting to the master storage device and performing data write control processing to the connected master storage device;
The storage device control server
It is determined whether or not update data can be written according to the presence or absence of data access in the master storage device. When it is determined that update data can be written, new update data stored in the upload storage device is stored in the upload storage device. An upload controller that writes to the master storage device and outputs an update notification;
Based on the update notification output by the upload control unit, it is determined whether or not update data can be written according to whether or not the download slave storage device has data access, and it is determined that update data can be written. 6. A download control unit that reflects the update in the download slave storage device by writing the update data in the download slave storage device. 6. Load balancing system. A data control system including a client terminal, a plurality of response servers that perform data write processing and data read processing on a storage device in response to a data access request from the client terminal, and an entrance system connected to the data control system An entrance system in a load balancing system connected via a network,
A bandwidth management server for acquiring access load information for each of the plurality of response servers included in the data control system;
Based on the access load information acquired by the bandwidth management server in response to a response server determination request received from the client terminal, one of the plurality of response servers is set as the data access request from the client terminal. And an entrance server that is selected as a response server that accepts the entrance system. The entrance server included in the entrance system is:
The entrance system according to claim 7, wherein an access control process is performed for each access priority according to priority identification information included in destination information of the response server determination request transmitted by the client terminal. The entrance server included in the entrance system is:
Based on the access load information for each response server acquired by the bandwidth management server, the total access load amount of the entire data control system is calculated, and control processing is performed for each access priority according to the calculated total access load amount. The entrance system according to claim 8, wherein the entrance system is performed. A data control system including a client terminal, a plurality of response servers that perform data write processing and data read processing on a storage device in response to a data access request from the client terminal, and an entrance system connected to the data control system A load balancing method in a load balancing system connected via a network,
The entrance system is
An access load information acquisition process for acquiring access load information for each of the plurality of response servers provided in the data control system;
A response server determination request receiving process for receiving a response server determination request from the client terminal;
A server that selects one of the plurality of response servers as a response server that receives the data access request from the client terminal based on the acquired access load information in response to the received response server determination request Judgment process,
A response process for responding the determination result to the client terminal,
The client terminal is
A response server determination request transmission process for transmitting the response server determination request to the entrance system;
A load distribution method comprising: a data access request transmission step of transmitting a data access request to a response server corresponding to a determination result by the entrance server in response to the transmitted response server determination request.

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