CN1495634A - Server clustering load balancing method and system - Google Patents
Server clustering load balancing method and system Download PDFInfo
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Abstract
The present invention relates to a streaming-media server cluster load equalizing method. It includes the following steps: creating a streaming-media server cluster, including a cluster control server and several streaming-media servers; creating a management system utilizing IRDP protocol to make work for said streaming-media server cluster, using said cluster control server as service end and using said these streaming-media servers as customer ends to form service end/customer end working mode, in which the request of terminal user can be transferred into customer end by service end, and said request of the terminal user can be processed in the concrete by customer.
Description
Technical field
The present invention relates to a kind of server cluster load-balancing method, with and SiteServer LBS, specifically, be a kind of method and system that is used for the streaming media server cluster load balancing of internet streaming transmission.
Background technology
At present, the load balancing of using at server mainly contains dual mode: the one, and specialized hardware; The 2nd, software.
So-called hardware load balancing, one has own IP exactly, support the router or the bridge of four layers of application of TCP/IP, come on the automatic network TCP/IP request to certain Web, at first connect with this equipment, then, load-balancing device is by certain algorithm (or claiming balance policy), packet is unpacked, repack again and change purpose IP, connection request and packet are transmitted to concrete server handle, last, by load-balancing device result is transmitted to client (promptly sending the browser of request) again.Current, main in the world popular, what generally adopted is the hardware load balancing.For example, network equipment vendor CISCO in the world and Intel etc. have the load balancing hardware product of oneself, some manufacturer server then adopts the method for OEM fully, and these load-balancing devices are called " function server ", as 71 series of products of the x-Server series of Chinese tide.
So-called software load equilibrium, its basic functional principle is identical with above-mentioned hardware load balancing, specific practice is with the load-balanced server of a computing machine as special use, two network interface cards are installed on this station server, by unpacking, pack again, delivering to the ICP/IP protocol data message, load balancing is assigned on the concrete Web server, and there is windows2000 AdvancedServer in its leading firm of this series products, and numerous Free Linux and BSD Vnix.In sum, existing hardware load balancing product or software load balanced product all exist dumb and balanced process general import of balanced distribution and outlet all to need data communication " bottleneck " problem of bringing by Control Server, greatly limited the speed of balanced process, and to the high request of the system configuration of Control Server.
Summary of the invention
To be solved by this invention is the technical matters that improves the ratio of performance to price of streaming media server load balancing product and adapt to dirigibility, therefore, the objective of the invention is to, a kind of method of streaming media server cluster load balancing is provided, and the streaming media server cluster SiteServer LBS of setting up according to this method.
Technical scheme of the present invention is as follows:
According to cluster load-balancing method of the present invention, its step comprises:
A. set up a streaming media server cluster, it comprises a cluster Control Server and some streaming media servers;
B. this streaming media server cluster is set up a management system with the work of IRDP agreement, be service end and be client with this cluster Control Server with these streaming media servers, form service end/client mode of operation, be responsible for terminal user's request is transmitted to client by service end, and by the concrete processing terminal user's of client request;
Further, the service end of described IRDP agreement/client mode of operation is meant that client can provide the performance report of each streaming media server at its place in real time, service end then is responsible for according to given load balancing strategy terminal user's RSTP request being transmitted to client, when carrying out a terminal user's services request, communicated with IRDP request mode and service end by the terminal user before this, again in streaming media server cluster inside, communicate by IRDP request mode by service end and client, select the streaming media server of an optimal service state, connect the terminal user of this proposition services request to be redirected mode, this streaming media server is with the concrete processing terminal user's of RSTP mode services request;
Described load balancing strategy comprises (1) dynamic load leveling, the balanced tabulation of (2) black/white list, the equilibrium of (3) IP oriented load, (4) wide area load balancing and (5) film source equilibrium;
More specifically, described client provides the performance report of each streaming media server at its place, comprises (1) each streaming media server load factor, (2) each streaming media server maximum number of connections, the current actual linking number of (3) each streaming media server, the current conversion linking number of (4) each streaming media server, (5) each streaming media server state and (6) scan period; The server load coefficient is meant according to the memory size that comprises streaming media server, access speed speed, CPU frequency height and the server load coefficient of fixed its processing power of expression, from the highest server configures extremely minimum server configures represent processing power greater than 0 less than load factor and a load factor of 1 with one respectively greater than 1; Described server maximum number of connections is meant the maximal value of concurrent connection number when website that memory size according to streaming media server, CPU frequency height provide connects threshold value and represents each streaming media server; The current actual linking number of described each streaming media server is meant the current concurrent linking number of each streaming media server; Described current conversion linking number is meant the concurrent connection number after the current conversion of each streaming media server, and its product with current actual linking number and server load coefficient is represented; Described streaming media server state is meant this cluster Control Server or each streaming media server is in state working properly or that break down, and the described scan period is meant that the initialization system timing automatic refreshes the time interval of the tabulation of each streaming media server work at present state;
Described dynamic load leveling is meant, the cluster Control Server carries out load balancing according to the multidate information that the current CPU of each streaming media server takies situation and EMS memory occupation situation, and self terminal user's tasks requested is distributed to current C PU in the future, that minimum streaming media server of EMS memory occupation goes to handle; Described black/white list tabulation equilibrium is meant, the cluster Control Server is according to the IP address list, enter the request of the User IP of blacklist for all, carry out the group system of IRDP agreement and will refuse to provide for it service, only enter the request of the User IP of white list, the system that carries out the IRDP agreement just can provide service for it, the equilibrium of described IP oriented load is meant, this cluster Control Server can be served giving streaming media server specific in the IRDP client from the terminal user's of some particular ip address request; Described wide area load balancing is meant, streaming media server in IRDP cluster can be placed on the whole world Anywhere, form one on a large scale, the distributed flow media server cluster system of cross-region, this cluster Control Server constitutes service end should be able to manage that this is large-scale, the distributed flow media server cluster system of cross-region, and described film source equilibrium is meant, the film source of every streaming media server in the IRDP client is not necessarily identical, if in streaming media server, then the IRDP service end should be able to specify this streaming media server to be its service to the film source of terminal user's appointment therein; If the film source of user's appointment is in many streaming media servers, then the IRDP service end utilizes the selected streaming media server of load balancing strategy to be its service;
According to cluster SiteServer LBS of the present invention, the receiving terminal that it connects the media data source end and contains some terminal users comprises: a cluster Control Server, and it moves cluster management software, forms the service end of system; By the streaming media server group that some streaming media servers constitute, form the client of system; System is with service end/client mode work, and in internal system, service end and client are with IRDP request/response mode communication cohesion; Externally, the streaming media server group of received is from the RTP packet of media data source end, with the connection of receiving terminal then is to be write to each other with IRDP request/response mode by the terminal user and the service end of the service of the requirement in the receiving terminal earlier, communicate by letter with IRDP request/response mode with client according to given load balancing strategy by service end (14) again and streaming media server that is in the optimal service state of selection from the streaming media server group, through re-orientation processes, this terminal user carries out in RTSP request mode with this selecteed streaming media server that control data is communicated by letter and carry out media streaming with the RTP/RTCP agreement.
Further, described streaming media server group comprises local some the balanced streaming media servers of IRDP;
Or described streaming media server group comprises some streaming media servers of distributed IRDP strange land equilibrium;
More specifically, the streaming media server of described composition streaming media server group is to look audio server, they through the Internet or directly and the media data source end, communicate by letter with the cluster Control Server with the IRDP agreement, and according to load-balancing method concrete terminal user's tasks requested is distributed to a audio server of looking that is in the optimal service state in them by the cluster Control Server.
The present invention compared with the prior art, owing to adopt the cluster load balancing structure, operation cluster balanced management software, use IRDP (resources allocation of Intelligent Resource Distributing Protocol intelligence) agreement and balance policy, make the cluster Control Server just carry out balancing operational at the initial stage of network terminal user request, after the Task Distribution, what really serve is streaming media server, by its direct communication with the terminal user of request service, and the cluster Control Server no longer participates in concrete media data transmission services, thereby, thoroughly having eliminated turnover in traditional equalization scheme all needs " bottleneck " problem of the data communication that brought by the cluster Control Server, greatly improved balancing speed, correspondingly, the requirement of the system configuration of cluster Control Server has also been reduced greatly.
Description of drawings
Fig. 1 is a streaming media server cluster SiteServer LBS structural representation of the present invention.
Fig. 2 is the Server/Client mode of operation synoptic diagram of IRDP agreement of the present invention.
Fig. 3 is the proud capable streaming media server group system of an application example of the present invention----.
Embodiment
Common Clustering has two kinds: the one, and adopt specialized hardware to carry out load balancing; Another is to adopt software to carry out load balancing.When the design flow media system, the invention provides support to dual mode.Fig. 1 has described a kind of streaming media server cluster method that the present invention proposes.Consider the cost performance and the dirigibility of software cluster simultaneously, the present invention proposes brand-new IRDP agreement, as shown in Figure 2, the IRDP agreement is to adopt based on Server)/Client (service end)/(client) pattern work.The core of this agreement is that its IRPD client 15 can provide the performance report (such as about cpu busy percentage, memory usage, magnetic disc i/o size, current concurrent connection number, current information such as bandwidth) of the server 110,111,112 at its place in real time.IRDP service end 14 wherein is responsible for according to given load balancing strategy, actual terminal user's 16 RSTP request is transmitted to IRDP client 15, these streaming media servers 110,111,112 of IRDP client 15 are responsible for processing terminal user 16 video request program request.IRDP service end 14 communicates by IRDP request mode with IRDP client 15, terminal user 16 then at first communicates with IRDP request mode and IRDP service end 14, after the request directional process again with the IP address after redirected, it is the IP address of appointed IRDP client 15, communicate by letter with appointed IRDP client 15 by RSTP request mode, and by this IRDP client 15 promptly: a chosen streaming media service implement body is handled this terminal user's 16 request.
In Fig. 1, streaming media server group 11 is as the IRDP client 15 of the group system of supporting IRDP agreement above-mentioned, it comprises streaming media server 111,112,113, cluster Control Server 10 is then as the service end 14 of IRDP agreement, provide the multiple strategy of load balancing flexibly and effectively to find a streaming media server 113 of current the most suitable processing terminal user 16 requests, and the IP address of this streaming media server 113 returned to terminal user 16, so just terminal user 16 request is redirected to this streaming media server 113.
Load balancing control is installed on this cluster Control Server 10 with management software, and this cluster Control Server 10 is generally only done the load balancing Task Distribution, but is not the actual server that network requests is handled.
Each streaming media server the 111,112, the 113rd in the streaming media server group 11, the specifically streaming media server that the terminal user's 16 that comes automatic network request is served, the web browser initial landing is to cluster controller server 10, and cluster Control Server 10 is redistributed to some streaming media servers in the streaming media server group 11 with actual task then.Wherein streaming media server will have fixed IP addresses, and domain name is then optional.The RTSP server site of setting in every streaming media server 111,112,113 is finished same function.After in the cluster Control Server 10 user 16 request being assigned to the streaming media server 113 of an appointment, specifically finish user 16 request by this streaming media server 113.
In the customization and implementation process of balance policy, the present invention has defined the foundation that the effective server performance parameter of a cover is distributed as load, and is specific as follows:
(1) server load coefficient
For some streaming media servers 111,112,113, because the difference that memory size and access speed CPU thereof, dominant frequency just exist, its concrete processing power can be different, is exactly for the duplicate server of configuration, also can produce certain difference when real work.In order really to accomplish load balancing, the present invention represents the concrete processing power of each streaming media server with the server load coefficient.That is to say that according to the configuration of streaming media server, a given reduction coefficient for server configures height, streaming media service platform that processing power is strong, gives a less coefficient, one greater than 0 less than 1 number (decimal), and for example streaming media server 111; Streaming media service for a little less than low, the processing power of configuration gives a bigger coefficient, and one greater than 1 number (integer or decimal), and for example streaming media server 113.
(2) streaming media server maximum number of connections
For some streaming media servers 11,112,113, because the difference of internal memory, CPU frequency, its concrete processing power can be different, concurrent linking number simultaneously there is maximum numerical limitations, so the maximal value of native system concurrent connection number when representing each streaming media server 111,112,113 with website " connection threshold value ".
(3) current actual linking number
Being used for representing each streaming media server 111,112,113 current concurrent linking numbers in the streaming media server group 11, is actual linking number.
(4) current conversion linking number
Current conversion linking number is to be used for representing in the streaming media service group 11 concurrent connection number after the current conversion in each streaming media server, be the product of actual linking number and server load coefficient, just can really embody the current concurrent connection situation of each streaming media server with current conversion linking number.
(5) streaming media server state
Reason owing to each streaming media server in the streaming media server group 11 111,112,113 self, perhaps owing to the reason of network, cisco unity malfunction between cluster Control Server 10 and the streaming media server 111,112,113, native system can detect the generation of this situation automatically, with representing that normally this streaming media server is working properly, otherwise with this streaming media server operation irregularity of representation for fault.
(6) scan period
In order to understand in the streaming media server group 11 each streaming media server 111,112,113 current connection situation and duty, the tabulation that system will regularly refresh each streaming media server work at present state automatically in real time.Scan period promptly is the time interval that system refreshes automatically.With the second is unit.This value can be set up on their own by the user.If setting value is excessive, then the phenomenon that monitor value does not conform to the actual conditions may appear.If setting value is too small, then accuracy is higher, but can stand with the resource of system.But after tested, the system resource that takies is very little, can not produce any influence basically.Therefore, the less scan period can be suitably set in suggestion.
Balance policy in the cluster scheme:
(1) dynamic load leveling----IRDP service end 14 is according to each streaming media server 110 in each IRDP client 15 in the streaming media server group, 111,112 current CPU take multidate informations such as situation and EMS memory occupation situation and carry out load balancing, assign the task to current C PU, a minimum streaming media server of EMS memory occupation.
(2) black/white list
So-called " blacklist " in fact is exactly the inventory of an IP address.Enter the request of the User IP of blacklist for all, carry out the group system of IRDP agreement and will refuse to provide for it service.So-called " white list " is actually the inventory of an IP address.Only enter the request of the User IP of white list, the group system of carrying out the IRDP agreement just can provide service for it.
(3) equilibrium of IP oriented load is meant, IRDP service end 14 can be served the specific IRDP client 15 of giving from the user's 16 of some particular ip address request.
(4) the wide area load balancing is meant, server in IRDP cluster can be placed on the whole world Anywhere, the distributed server group who forms large-scale a, cross-region, IRDP service end 14 can manage that this is large-scale, the distributed type assemblies server zone of cross-region.
(5) the film source equilibrium is meant, the film source in the IRDP client 15 is not necessarily identical, if the film source of user's 16 appointments in IRDP client 15, then IRDP service end 14 should be able to specify this IRDP client 15 to be its service.If many streaming media servers of the film source of user's 16 appointments in many IRDP clients 15, then IRDP service end 14 utilizes a streaming media server in the load balancing strategy qualification IRDP client 15 to be its service.
Consult Fig. 2, after having defined set of parameter and balance policy, the communication that the IRDP agreement is concrete and the process prescription of equilibrium treatment are as follows:
After group system was started working, IRDP service end 14 was regularly sent the IRDP request to each IRDP client according to the refresh cycle designated time intervals.After each IRDP client 15 is received the IRDP request, return the IRDP response, report its current state to IRDP service end 14.
IRDP client 15 may break down, and at this moment IRDP service end 14 just can not receive the IRDP response.Be limited to Tout when therefore timeout mechanism of IRDP service end 14 settings is overtime, with deciding current IRDP client of inquiring about whether in work.IRDP service end 14 is not received the IRDP response at Tout in the time after sending the IRDP request, think that then the IRDP client of being inquired about has quit work.
(1) whether the IP address of judging the visitor in blacklist, if, respond " denial of service " IRDP response, otherwise, carried out for (2) step;
(2) whether the IP address of judging the visitor in IP oriented load list, if, respond to terminal user 16 and to be redirected the IRDP response, be redirected the IP address that the IP address is the IRDP client 15 of appointment in the IP oriented load list;
(3) find out and comprise all IRDP clients 15 of asking film source, as do not find, respond " film source of request does not exist, and service can not be provided " IRDP response,, carry out (4) and go on foot as only finding an IRDP client 15; As find a plurality of IRDP clients 15, carried out for (5) step;
(4) send " being redirected " IRDP response to terminal user 16, be redirected the IP address that the IP address is this IRDP client 15;
(5) find the IRDP client 15 of current " state the best " automatically according to information such as the current conversion linking number of each IRDP client 15, internal memory operating position, cpu usages, respond " being redirected " IRDP response to terminal user 16, be redirected the IP address that the IP address is this " state the best " IRDP client 15;
(6) terminal user 16 carries out direct interworking with IRDP client 15.IRDP service end 14 is got in touch with terminal user 16 request disengaging, can continue to serve other IRDP client 15.
According to the present invention, an actual cluster scheme of using will be described below, proud capable streaming media server group system as shown in Figure 3 wherein provides following load balancing strategy:
(1) minimum linking number is preferential
(2) the minimum network bandwidth is preferential
(3) server performance is preferential
(4) IP oriented load equilibrium
The principle of work that this system is concrete is as follows:
This system is made up of a proud capable cluster Control Server 20 and some proud capable streaming media servers.Wherein the function of being moved in each proud capable streaming media server is identical, then moves proud capable cluster management software OS Cluster Manager in the proud capable cluster Control Server 20.When end-user access, the network address of its input is at proud capable Control Server 20, after proud capable Control Server receives user's request, to be that terminal user IP address judges whether to provide for it service by the visitor, if service can be provided, suitable proud capable streaming media server will be sought according to the IP oriented load earlier by system, if do not belong to IP oriented load scope, then according to each proud capable streaming media server 310,302,303,40 current conversion linking numbers, the internal memory operating position, the proud capable streaming media server that information such as cpu usage find automatically current " state the best ", request with the visitor redirects on this proud capable streaming media server then, turn back to the terminal user by this proud capable streaming media service implement body response user's request and with the result, and proud capable cluster Control Server and this terminal user disengaging are got in touch, and can continue as other terminal user's request and serve.
In actual applications, 20 initial stages in terminal user's request of proud capable cluster Control Server are carried out balancing operational, after Task Distribution is finished, direct communication between proud capable streaming media server 1 of really serving and the terminal user, proud capable cluster Control Server 20 no longer participates in work, thereby thoroughly eliminated turnover in traditional equalization scheme and all needed data communication " bottleneck " problem brought by proud capable Control Server 20, greatly improved balanced speed, correspondingly the requirement to the system configuration of proud capable Control Server also greatly reduces.
Claims (19)
1, a kind of streaming media server cluster load-balancing method, its step comprises:
A. set up a streaming media server cluster, it comprises a cluster Control Server and some streaming media servers;
B. this streaming media server cluster is set up a management system with the work of IRDP agreement, be service end and be client with this cluster Control Server with these streaming media servers, form service end/client mode of operation, be responsible for terminal user's request is transmitted to client by service end, and by the concrete processing terminal user's of client request.
2, streaming media server cluster load-balancing method according to claim 1, it is characterized in that, the service end of described IRDP agreement/client mode of operation is meant that client can provide the performance report of each streaming media server at its place in real time, service end then is responsible for according to given load balancing strategy terminal user's RSTP request being transmitted to client, when carrying out a terminal user's services request, communicated with IRDP request mode and service end by the terminal user before this, again in streaming media server cluster inside, communicate by IRDP request mode by service end and client, select the streaming media server of an optimal service state, connect the terminal user of this proposition services request to be redirected mode, this streaming media server is with the concrete processing terminal user's of RSTP mode services request.
3, streaming media server cluster load-balancing method according to claim 2, it is characterized in that, described client provides the performance report of each streaming media server at its place, comprises (1) each streaming media server load factor, (2) each streaming media server maximum number of connections, the current actual linking number of (3) each streaming media server, the current conversion linking number of (4) each streaming media server, (5) each streaming media server state and (6) scan period.
4, streaming media server cluster load-balancing method according to claim 3, it is characterized in that, described server load coefficient is meant according to the memory size that comprises streaming media server, access speed speed, CPU frequency height and the server load coefficient of fixed its processing power of expression, from the highest server configures extremely minimum server configures represent processing power greater than 0 less than load factor and a load factor of 1 with one respectively greater than 1.
5, streaming media server cluster load-balancing method according to claim 3, it is characterized in that described server maximum number of connections is meant the maximal value of concurrent connection number when website that memory size according to streaming media server, CPU frequency height provide connects threshold value and represents each streaming media server.
6, streaming media server cluster load-balancing method according to claim 3 is characterized in that, the current actual linking number of described each streaming media server is meant the current concurrent linking number of each streaming media server.
7, streaming media server cluster load-balancing method according to claim 3, it is characterized in that, described current conversion linking number is meant the concurrent connection number after the current conversion of each streaming media server, and its product with current actual linking number and server load coefficient is represented.
8, streaming media server cluster load-balancing method according to claim 3 is characterized in that, described streaming media server state is meant this cluster Control Server or each streaming media server are in state working properly or that break down.
9, streaming media server cluster load-balancing method according to claim 3 is characterized in that, the described scan period is meant that the initialization system timing automatic refreshes the time interval of the tabulation of each streaming media server work at present state.
10, streaming media server cluster load-balancing method according to claim 2, it is characterized in that described load balancing strategy comprises (1) dynamic load leveling, the balanced tabulation of (2) black/white list, the equilibrium of (3) IP oriented load, (4) wide area load balancing and (5) film source equilibrium.
11, streaming media server cluster load-balancing method according to claim 10, it is characterized in that, described dynamic load leveling is meant, the cluster Control Server carries out load balancing according to the multidate information that the current CPU of each streaming media server takies situation and EMS memory occupation situation, self terminal user's request in the future distribute to current C PU, that minimum streaming media server of EMS memory occupation goes to handle.
12, streaming media server cluster load-balancing method according to claim 10, it is characterized in that, described black/white list tabulation equilibrium is meant, the cluster Control Server is according to the IP address list, enter the request of the User IP of blacklist for all, carry out the group system of IRDP agreement and will refuse to provide for it service, the request that only enters the User IP of white list, the system that carries out the IRDP agreement just can provide service for it.
13, streaming media server cluster load-balancing method according to claim 10, it is characterized in that, the equilibrium of described IP oriented load is meant, this cluster Control Server can be served giving streaming media server specific in the IRDP client from the terminal user's of some particular ip address request.
14, streaming media server cluster load-balancing method according to claim 10, it is characterized in that, described wide area load balancing is meant, streaming media server in IRDP cluster can be placed on the whole world Anywhere, the distributed flow media server cluster system of forming large-scale a, cross-region, this cluster Control Server constitute service end should be able to manage that this is large-scale, the distributed flow media server cluster system of cross-region.
15, streaming media server cluster load-balancing method according to claim 10, it is characterized in that, described film source equilibrium is meant, the film source of every streaming media server in the IRDP client is not necessarily identical, if in streaming media server, then the IRDP service end should be able to specify this Streaming Media body server to be its service to the film source of terminal user's appointment therein; If the film source of user's appointment is in many streaming media servers, then the IRDP service end utilizes the selected wherein streaming media server of load balancing strategy to be its service.
16, a kind of streaming media server cluster SiteServer LBS, the receiving terminal that it connects the media data source end and contains some terminal users comprises:
A cluster Control Server (10), it moves cluster management software, forms the service end (14) of system;
By the streaming media server group (11) that some streaming media servers (111,112,113) constitute, form the client (15) of system;
System is with service end/client mode work, and in internal system, service end (14) and client (15) are with IRDP request/response mode communication cohesion; Externally, streaming media server group (11) receives the RTP packet from the media data source end, with the connection of receiving terminal then is to be write to each other with IRDP request/response mode by the terminal user and the service end (14) of the service of the requirement in the receiving terminal earlier, communicate by letter with IRDP request/response mode with client (15) according to given load balancing strategy by service end (14) again and streaming media server that is in the optimal service state of selection from streaming media server group (11), through re-orientation processes, this terminal user and this selecteed streaming media server are in RTSP request mode.Carry out control data communication and carry out media streaming with the RTP/RTCP agreement.
17, streaming media server cluster SiteServer LBS according to claim 16 is characterized in that, described streaming media server group (11) comprises local some the balanced streaming media servers of IRDP.
18, streaming media server cluster SiteServer LBS according to claim 16 is characterized in that, described streaming media server group (11) comprises some streaming media servers of distributed IRDP strange land equilibrium.
19, according to claim 16 or 17 or 18 described streaming media server cluster SiteServer LBSs, it is characterized in that, the streaming media server of described composition streaming media server group (11) is to look audio server, they through the Internet or directly and the media data source end, communicate by letter with cluster Control Server (10) with the IRDP agreement, and according to load-balancing method concrete terminal user's tasks requested is distributed to a audio server of looking that is in the optimal service state in them by cluster Control Server (10).
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-
2003
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| CN1841997B (en) * | 2005-03-30 | 2011-05-18 | 索尼株式会社 | Information process distribution system, information processing apparatus and information process distribution method |
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