CN101877725A - Copy management method and device in distributed storage system - Google Patents
Copy management method and device in distributed storage system Download PDFInfo
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- CN101877725A CN101877725A CN2010102152157A CN201010215215A CN101877725A CN 101877725 A CN101877725 A CN 101877725A CN 2010102152157 A CN2010102152157 A CN 2010102152157A CN 201010215215 A CN201010215215 A CN 201010215215A CN 101877725 A CN101877725 A CN 101877725A
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Abstract
The invention discloses copy management method and device in a distributed storage system. The method comprises the following steps of: acquiring an intra-domain connecting parameter of a user and a system in each period; judging the following conditions through the connecting parameter: whether an experience weight coefficient indicating a connecting state of the user and a network is larger than a first threshold value or not, whether the request number of times to the copy is larger than a second threshold value or not and whether a health degree indicating the performance level of the copy is smaller than a third threshold value or not; and if the conditions are determined to all hold and the request number of times to the copy in a plurality of continuous periods before a current period is judged not to be zero, adding the copy into an affiliation domain of the user in the system. In the invention, considering from aspects of the experience weight coefficient, the request number of times to the copy, the health degree of the copy and the recent access quantity of the copy of the user, the load bearing capability of the system and the downloading experience of the user are both considered, and the problem of low downloading speed of the user or higher server load is solved.
Description
Technical field
The present invention relates to the communications field, copy management method and device in a kind of distributed memory system.
Background technology
In distributed memory system based on user experience, the storage system in each territory that distributed memory system is made up of as node a plurality of servers.The quantity of client's downloading experience decision copy, copy amount also affects client's experience effect.When client's file in download, if do not have copy in the territory at client place, just can obtain data from the node in other territory, the transmission speed of tentation data between the territory is very low, and the transmission speed in the territory is very high, just can influence user's downloading experience this moment.Therefore, experience when relatively lower, just need to consider whether in this territory, to increase a copy to improve user's downloading experience when intra domain user.
In distributed memory system, if when the content of client requests does not exist in the current field,, cause client's request to can not get responding timely just can cross-domainly seek data, if increase this copy in the territory, client's request just can be responded rapidly.Yet, increase the pressure that copy can increase server to a certain extent, also can take disk and bandwidth, increase the load of this server.
Therefore, client's downloading experience is very low, and a large amount of download demands that continue are arranged again, just can increase a copy in this territory, to satisfy user's downloading experience.Otherwise, can not improve user's experience value if increase copy, then need not carry out the copy diffusion.Yet, whether increase copy and need consider many-sided factor.And in the present technology, only from unilaterally, as initiate to ask some aspects such as the number of users of downloading, the load of server to weigh whether increase copy, owing to, do not cause the slow or server load problem of higher of user's download speed from many-sided comprehensive measurement such as the load ability to bear of server and user's downloading experience.
Summary of the invention
Main purpose of the present invention is to provide copy management method and the device in a kind of distributed memory system, above-mentioned to solve at least owing to whether do not increase copy from the load ability to bear of server and user's the comprehensive measurement of many-sides such as downloading experience, cause the slow or server load problem of higher of user's download speed.
The invention provides the copy management method in a kind of distributed memory system, comprising:, obtain the parameter that is connected of user and system in the territory in each cycle; Judge following condition by connecting parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of copy whether greater than second threshold value, whether the health degree of indicating the copy performance level less than the 3rd threshold value; All set up and judge in a plurality of consecutive periods before current period all non-vanishingly if determine condition, then in the territory of intrasystem user attaching, increase copy for the request number of times of copy.
The present invention also provides the device of the replica management in a kind of distributed memory system, comprising: the parameter acquisition module, be used in each cycle, and obtain the parameter that is connected of user and system in the territory; First judge module, be used for judging following condition by connecting parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of copy whether greater than second threshold value, whether the health degree of indication copy performance level less than the 3rd threshold value, the judged result whether output condition is set up; Second judge module, if be used for the judged result that the first judge module output condition sets up and judge in a plurality of consecutive periods before current period, the request number of times for copy in each cycle is all non-vanishing, then exports triggering signal; The copy diffuse module after being used to receive triggering signal, increases copy in the territory of intrasystem user attaching.
The present invention is owing to consider from user's experience weight coefficient, the request number of times of copy and the health degree of copy and recent three kinds of aspects of copy visit capacity, thereby taken into account the load ability to bear of system and user's downloading experience, solved the slow or server load problem of higher of user's download speed.In addition, also can further consider the diffusion time of copy and make the health degree of copy in this territory reach for 1 time, whether further increase copy thereby draw decision and since more refinement increase the condition of copy, thereby more balance conflicting between load and the user experience of system.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the embodiment of the invention one;
Fig. 2 is the flow chart of the embodiment of the invention two;
Fig. 3 is the structured flowchart of the embodiment of the invention three.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Describe each embodiment of the present invention in detail below in conjunction with accompanying drawing, the flow chart referring to embodiment shown in Figure 1 comprises:
S11:, obtain the parameter that is connected of user and described system in the territory in each cycle;
The user comprises with the parameter that is connected of system: user's speed of download, user's surfing, user's request number of times and user's the multiple parameters that are connected such as average bandwidth.
S12: judge following condition by described connection parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of described copy whether greater than second threshold value, whether the health degree of indicating described copy performance level less than the 3rd threshold value.
Preferably, can judge successively,, then return wait and enter the next cycle as long as there is a condition not satisfy according to the order of experiencing threshold value, request number of times, health degree; Certainly, also can judge according to other order.
In embodiment one, with the module of user experience value (UE) as system's replica management, user experience value is a quantized value that obtains on the basis of all influencing factors considering.First condition of carrying out the copy diffusion in the current field is: the user experience value of the current field is lower than first threshold.
So-called experience value is low to refer to:
Wherein, UElocal is the user experience value of the current field.The experience value can draw by current parameter summation computing, and as summation, mode such as average, parameter can adopt at that time bandwidth of user, speed of download, access speed, connection speed etc.
UEaverage has the mean value that the user experience value in the territory of this copy is got to all.
TUE is a threshold values ratio, i.e. first threshold when formula (1) when satisfying, just thinks that the user experience value of the current field is low.
Have only when intra domain user experience to be worth when low, just be necessary to further consider others, and consider whether in the territory, to increase on the server complete copy and improve user experience.When not having copy in the territory, the client will download from the node in other territories, yet, generally speaking, the data transmission bauds between the territory than the data transmission bauds in the territory slowly many, this moment this territory user experience may be lower.Certainly, if network condition is very good, even there is not the copy of this document in the server of the current field, but user experience value is still very high, just there is no need to consider to carry out the copy diffusion.Because spread the experience that this copy can not very improve the user significantly, take the disk resource of flow and server between the territory again, lose more than gain.
After having judged user's experience weight coefficient, whether the request number of times that continues to judge copy under situation that formula (1) satisfy, adds up the visit temperature of this document, i.e. file the current field in this copy requested number of times greater than second threshold value.The visit temperature of file also is to consider a key factor of copy diffusion, when the visit temperature of file reaches certain threshold values, will trigger next step Rule of judgment, and this threshold values can be set according to the demand of system.Even have only a client also will consider its experience value if system is thought, that just should be made as 0 with this threshold values.If system need be set at other constant values,, just temporarily do not consider in this territory, to increase copy if the request number does not reach threshold values.Have only when asking number to surpass threshold values, just consider to enter again the diffusion that next step judges the copy of making a strategic decision.
The request number of times of judging copy can adopt as shown in the formula:
FREall＞FRElimit formula (2)
Wherein FREall is the present accumulative total visit temperature of this document, and FRElimit is second threshold value that increases copy and carry out follow-up judgement.
After the request number of times of having judged experience weight coefficient, copy, also need to judge the health degree of copy.Describe the process of judging health degree below in detail:
When formula (2) when satisfying, the health degree of file in the territory will be further considered.Health degree H is meant, health degree is the ratio that the size that is used to refer to the copy summation that each node had in the territory accounts for whole copy.Also can be defined as the quantity of this document complete copy that all nodes have altogether in the territory.If health degree is 1, the content that each node in this territory is described is added up and can be constituted a complete copy, if health degree is 2, illustrates that the content of each node in the territory can constitute two copies.
Therefore, can think that the file health degree is high more in the territory, transmission speed is fast more, and available resource is many more in the territory, and user's download is experienced high more.Because transmission speed is less than speed in the territory between the territory, the file health degree reached before 1 in the territory, the client can be according to minimum preferential strategy, as far as possible from obtaining remaining between the territory, it is slower that obtain the speed of data this moment, user experience value is lower, judges further then whether this document has lasting demand, whether increases a copy with decision in this territory; If health degree greater than 1, illustrates a complete copy has been arranged in the territory, client's request can access response fast in the territory, need not consider to increase this copy.
Server timing each node in the territory sends the information of collecting health degree, and node returns to server after calculating bitmap.When node is received the collection order of server, the bitmap of oneself is issued server, the bitmap that server is replied all nodes again with, thereby obtain health degree H.
To the judgement of health degree the time, the 3rd threshold value can be set, and whether the health degree of judging copy in the territory is greater than the 3rd threshold value, the 3rd threshold value preferably is set to 100%.
S13: all set up and judge in a plurality of consecutive periods before current period all non-vanishingly if determine described condition, then in the territory of described intrasystem described user attaching, increase copy for the request number of times of described copy.
All set up when above-mentioned Rule of judgment, illustrate that then current user's experience is lower, illustrate that the user is relatively poor with the degree that is connected of network; The request number of times of copy is higher, illustrates that user's the download of needs is bigger; The health degree of copy is lower, and illustrating in the user's download copy process to need more cross-domain download, and the speed of cross-domain download can be less than the speed of downloading in the territory, thereby reduce user's experience.
After the factor of considering aspect above-mentioned three, also can judge nearest copy access times, thereby more comprehensively whether consideration needs to increase copy.
The recent access times of copy, can by in a plurality of consecutive periods of statistics before the current period for the request number of times of described copy, for example, add up the access times λ of continuous two time periods
1, λ
2, and judge in two continuous cycles whether the number of times of visit all is not 0, i.e. λ
1＞0﹠amp; ﹠amp; λ
2＞0, if, illustrate that then this file has lasting demand in this territory, need be at copy of this territory diffusion.In this case, after this territory increased a copy, based on the fact faster than cross-domain transmission speed of the transmission speed in the territory, user experience value can access certain raising, also can satisfy the lasting demand of this intra domain user to this document simultaneously.
Through after the above-mentioned deterministic process, owing to consider from user's experience weight coefficient, the request number of times of copy and the health degree of copy and recent three kinds of aspects of copy visit capacity, thereby taken into account the load ability to bear of system and user's downloading experience, solved the slow or server load problem of higher of user's download speed.
In the above embodiments one, describe the process that increases a copy in detail, in the above embodiments one, as the statistics number λ of two time periods
1, λ
2The situation of visit whether all occurred, also can further consider the diffusion time of copy and make the health degree of copy in this territory reach for 1 time whether further increase copy thereby draw decision.
Describe in detail below by embodiment two, the schematic diagram referring to shown in Figure 2 may further comprise the steps:
S211: enter latent period.
S212: whether judgement time finishes in latent period, if, execution in step S213 then, otherwise execution in step S211.
S213: whether the experience weight coefficient of judging the user greater than first threshold, if, execution in step S214 then, otherwise execution in step S211.
If greater than first threshold, illustrate that then the communication quality between active user and the network is relatively poor, the computational process of experience weight system can be referring to the step S12 among the embodiment one.
S214: whether the request number of times of judging copy greater than second threshold value, if, execution in step S215 then, otherwise execution in step S211.
If greater than second threshold value, illustrate that then current user's request number of times is too high, need with network between higher being connected arranged, need to increase copy, to reduce the pressure of system, improve user's experience.
S215: whether the health degree of judging copy greater than the 3rd threshold value, if not, and execution in step S216 then, if, execution in step S211 then.
If the health degree of current copy, then illustrates user's link greater than the 3rd threshold value and can finish in the territory, needn't be cross-domain, can not influence user's access speed.Otherwise explanation need increase copy in the territory.
S216: judge in two continuous cycles whether the access times in each cycle are all non-vanishing, if, execution in step S219 then, otherwise execution in step S217a.
Judge the access times of copy at no distant date, thereby illustrate whether the recent visit of copy is frequent, if in continuous two cycles visit is arranged all, then the explanation visit is frequent, needs the increase copy.
Through after the above-mentioned deterministic process, after experience weight coefficient, copy request number of times, health degree and recent access times all satisfy condition, thereby increase a copy, to improve user's access speed, as download speed, link speed etc., reduce system because the less load that causes of copy.
Statistics number λ in above-mentioned two time cycles
1, λ
2, judge in two cycles whether all visits all occur, also can further consider the diffusion time of copy and make the health degree of copy in this territory reach for 1 time whether further increase copy thereby draw decision.
S217a: judge in two continuous cycles whether the access times in each cycle are zero, if, execution in step S218 then, otherwise execution in step S217b.
If be zero, illustrate in two nearest cycles, in the current field this document is not had lasting demand, this moment execution in step S218, consider to arrive the needed time of this territory when complete copy of diffusion, during with indiffusion, this territory health degree reaches 1 difference that also needs the time on current basis, judge whether to be worth the diffusion copy.This territory health degree reaches 1 on current basis also need the time, for example, current health degree is 0.8, by user's continuous cross-domain visit, each node in the territory also can be constantly cross-domain data cached, thereby make the health degree in this territory reach for 1 needed time.
If not being zero, then explanation still has certain visit capacity, this moment execution in step S217b.
S217b: judge that in two continuous cycles, whether the summation of access times is greater than the 4th threshold value N
New, if not, execution in step S218 then, if, execution in step S219 then.
When access times greater than the 4th threshold value N
NewThe time, think that this territory client is bigger to the demand of this file, can be considered as having the situation of lasting demand the same, execution in step S219 with this territory.
If not, i.e. the user capture of two periods is counted sum smaller or equal to the 4th threshold values N
NewThe time, think that this territory client is little to the demand of this file, execution in step S218.
S218: whether the time of judging diffusion copy in this territory reaches for 1 time greater than copy health degree in this territory.If less than, execution in step S219 then, if greater than, execution in step S211 then.
The time of supposing the required cost of complete copy of server diffusion of the current field is T
Cs, it is T that this document reached for 1 needed time at the health degree of the current field
Nature
For time estimation T
CsThe time size, need know the diffusion velocity V of file size S and server
CsDiffusion velocity V
CsBe the speed of server from other territory file in download, relevant with the situation of current I O, file size and diffusion velocity just can estimate T after all determining
CsThe time size.
For time T
Nature, T computing time
NatureJust need obtain the file health degree H in the present node
CurCross-domain speed of download V with each node
ThroughThe health degree H of file in the territory
CurReach 1 required downloaded files size summation S
Left=S* (1-H
Cur), wherein S is the size of a complete copy.Just can pass through formula T after having obtained these two values
Nature=S
Left/ V
ThroughCalculating is sent as an envoy to, and the health degree of file reached for 1 needed time among the client of the current field.
If difference DELTA T=T
Nature-T
CsValue greater than 0, explanation need be spread a copy in the server of the current field, oversize because the user obtains the time of complete copy from other territory, can be rapidly for request in the territory provide service after the copy diffusion is come, and can improve user's experience.Thereby execution in step S219.
If difference DELTA T=T
Nature-T
CsValue less than 0, just think to there is no need to have increased copy that because the territory interior nodes can have a complete copy soon, user request can be handled fast in the territory.Thereby turn to step S211, wait for entering the next cycle.
S219: copy of diffusion in this territory.
Describe embodiments of the invention two above in detail,, weighed the statistics number λ of two recent time periods for embodiments of the invention two
1, λ
2The situation that visit whether all occurred, also can further consider the diffusion time of copy and make the health degree of copy in this territory reach for 1 time, thereby draw decision and whether further increase copy, since more refinement increase the condition of copy, thereby more balance conflicting between load and the user experience of system.
Described method embodiment of the present invention above in detail,, can be installed in the various chips by the form of various integrated circuits for method embodiment of the present invention, provide preferred device embodiment of the present invention below, thereby its structure is described,, comprises referring to Fig. 3:
Parameter acquisition module 31 was used in each cycle, obtained the parameter that is connected of user and described system in the territory;
First judge module 32, be used for judging following condition by described connection parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of described copy whether greater than second threshold value, whether the health degree of indicating described copy performance level exports judged result that whether described condition set up less than the 3rd threshold value;
Second judge module 33, described first judge module is exported in the judged result and a plurality of consecutive periods of judgement before current period of described condition establishment, the request number of times for described copy in each cycle is all non-vanishing if be used for, and then exports triggering signal;
Copy diffuse module 34, be used to receive described triggering signal after, in the territory of described intrasystem described user attaching, increase copy.
Preferably, also comprise:
The 3rd judge module 35, if being used for described first judge module 32 exports the judged result of described condition establishment, judges in a plurality of consecutive periods before current period, all request number of times sums that request number of times in each cycle is not zero entirely and described a plurality of consecutive periods is interior are then exported triggering signal greater than the 4th threshold value.
Preferably, also comprise:
The 4th judge module 36, if being used for described first judge module 32 exports the judged result of described condition establishment, judges in a plurality of consecutive periods before current period, in each cycle for the request number of times of described copy be zero and in this territory the time of the described copy of diffusion reach for 1 time naturally less than the health degree of described copy in this territory, then export triggering signal.
Describe device of the present invention above in detail,, can realize each step in the foregoing description, do not give unnecessary details one by one at this for device of the present invention.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. the copy management method in the distributed memory system is characterized in that, comprising:
In each cycle, obtain the parameter that is connected of user and described system in the territory;
Judge following condition by described connection parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of described copy whether greater than second threshold value, whether the health degree of indicating described copy performance level less than the 3rd threshold value;
All set up and judge in a plurality of consecutive periods before current period all non-vanishingly if determine described condition, then in the territory of described intrasystem described user attaching, increase copy for the request number of times of described copy.
2. method according to claim 1 is characterized in that, exists one to be false at least if judge described condition, then waits for entering the next cycle.
3. method according to claim 2, it is characterized in that, in turn judge described experience weight coefficient, described request number of times and described health degree, in deterministic process successively by described connection parameter, in case determine that described condition is false, then wait for entering the next cycle.
4. method according to claim 1 is characterized in that, also comprises:
If determining described condition all sets up and judges in a plurality of consecutive periods before current period, all request number of times sums that request number of times in each cycle is not zero entirely and described a plurality of consecutive periods is interior then increase the step of copy greater than the 4th threshold value in the territory of described intrasystem described user attaching.
5. method according to claim 1 is characterized in that, also comprises:
If determining described condition all sets up and judges in a plurality of consecutive periods before current period, in each cycle for the request number of times of described copy be zero and in this territory the time of the described copy of diffusion reach for 1 time naturally less than the health degree of described copy in this territory, then in the territory of described intrasystem described user attaching, increase the step of copy.
6. method according to claim 5, it is characterized in that, also comprise: reach for 1 time if judge in this territory the required time of the described copy of diffusion greater than the health degree of described copy in this territory, then needn't carry out the copy diffusion, enter next latent period.
7. method according to claim 1 is characterized in that, the described process that parameter obtains corresponding experience weight coefficient that is connected by user and described system comprises:
Obtain repeatedly experience weight by the user with the parameter that is connected of described system;
Obtain the average of described repeatedly experience weight and the difference of this experience weight;
With described difference with the ratio of described average as described experience weight coefficient.
8. the replica management device in the distributed memory system is characterized in that, comprising:
The parameter acquisition module was used in each cycle, obtained the parameter that is connected of user and described system in the territory;
First judge module, be used for judging following condition by described connection parameter: the experience weight coefficient of indication user and network connection state whether greater than first threshold, for the request number of times of described copy whether greater than second threshold value, whether the health degree of indicating described copy performance level exports judged result that whether described condition set up less than the 3rd threshold value;
Second judge module, described first judge module is exported in the judged result and a plurality of consecutive periods of judgement before current period of described condition establishment, the request number of times for described copy in each cycle is all non-vanishing if be used for, and then exports triggering signal;
The copy diffuse module, be used to receive described triggering signal after, in the territory of described intrasystem described user attaching, increase copy.
9. device according to claim 8 is characterized in that, also comprises:
The 3rd judge module, if being used for described first judge module exports the judged result of described condition establishment, judges in a plurality of consecutive periods before current period, all request number of times sums that request number of times in each cycle is not zero entirely and described a plurality of consecutive periods is interior are then exported triggering signal greater than the 4th threshold value.
10. device according to claim 8 is characterized in that, also comprises:
The 4th judge module, if being used for described first judge module exports the judged result of described condition establishment, judges in a plurality of consecutive periods before current period, in each cycle for the request number of times of described copy be zero and in this territory required time of the described copy of diffusion reach for 1 time naturally less than the health degree of described copy in this territory, then export triggering signal.
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