CN102006330B - Distributed cache system, data caching method and inquiring method of cache data - Google Patents
Distributed cache system, data caching method and inquiring method of cache data Download PDFInfo
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Abstract
The invention discloses a distributed cache system, a data caching method and an inquiring method of cache data. The distributed cache system comprises at least two cache server farms, wherein each cache server farm is provided with at least one cache server node, one of the at least two cache server farms and one cache server node of the cache server farm respective serve as the main cache server farm and the main cache server node of the cache data, the other cache server farm and one of the cache server nodes serve as the backup cache server farm and the backup cache server node of the cache data, and the main cache server node and the backup cache server node save the same cache data. The invention can ensure the high reliability of the cache data in the cache server farm, and improve the quality of the web service.
Description
Technical field
The present invention relates to the internet data cache field, relate in particular to the caching method of a kind of distributed cache system, data and data cached querying method.
Background technology
In the internet, applications field, Data cache technology is most important, not only will guarantee the extensibility of data buffer storage, also will guarantee performance, the reliability of data buffer storage.Similar caching system can solve scaling concern greatly, but can't solve well the reliability of buffer memory, and for the buffer memory of the information such as frequently-used data, session, needs very high reliability.
A kind of cache structure as shown in Figure 1, WEB server and caching server are one, that is to say data buffer storage in internal memory, do not need network service, when the WEB server need to restart, the data cached of client also lost like this; Moreover, because identical data will be carried out buffer memory on different WEB servers, hit rate (hit rate=hits/[hits+do not have hits]) is also lower like this.
Improved cache structure is that Cache servers (caching server) are separated with the WEB server, as shown in Figure 2, WEB server after separation can be deposited in the caching server node data cached, search from node in when inquiry data cached, if can not find data cached.From data base querying, and then write data into this node.Such advantage is that cacheable data volume can be expanded by increasing caching server, shoots straight, and restarts separate unit WEB server and also can not affect the buffer memory service.
But above framework still can affect service when certain caching server is delayed machine, if buffer memory is frequently-used data storehouse content information, can cause the moment concurrency to increase, and causes the database machine of delaying; If buffer memory is user session data, can cause user conversation forever to be lost, the user also needs again to login, and WEB service quality is had a greatly reduced quality.
Summary of the invention
Embodiments of the invention aim to provide a kind of distributed cache system and write data cached method, to solve at the integrity problem that writes when data cached.
For achieving the above object, embodiments of the invention provide a kind of distributed cache system, comprising:
At least two caching server groups;
Wherein each caching server group has at least one caching server node;
A caching server group in wherein said at least two caching server groups and a caching server node in this caching server group are respectively as data cached master cache server zone and master cache server node, and other caching server group and one of them caching server node are as described data cached backup caching server group and backup caching server node;
Wherein said master cache server node and described backup caching server node have identical data cached.
According to one embodiment of present invention, described master cache server zone and described master cache server node are decided by described data cached key.
According to one embodiment of present invention, described backup caching server node and described master cache server node have corresponding relation.
The present invention also provides a kind of caching method of reliable data, and described method is:
S1: data cached in the master cache server node of at least two caching server groups' master cache server zone;
S2: with described data buffer storage in backup caching server group's backup caching server node.
According to one embodiment of present invention, described step S1 comprises:
S101: according to the key of described data, obtain the master cache server zone of described data;
S102: according to the key of described data, obtain the master cache server node that described data are treated buffer memory in described master cache server zone;
S103: described data and described key are deposited in the described master cache server node that gets.
According to one embodiment of present invention, described method also comprises: when depositing described data in, write the expired time that described data deposit in.Corresponding to the caching method of above-mentioned data, the present invention also provides a kind of data cached querying method, and described method is:
S3: search data cached at least in the master cache server node of two caching server groups' master cache server zone;
S4: if do not find, search data cached in backup caching server group's backup caching server node.
According to one embodiment of present invention, described step S3 comprises:
S31: according to data cached key to be checked, search the described data cached master cache server zone that deposits in;
S32: according to described key, search the described data cached master cache server node that deposits in the described master cache server zone that finds;
S33: described data cached in the described master cache server node inquiry that finds according to described key, if find, directly return to find data cached.
According to one embodiment of present invention, in described step S31, hash code (Hash codes) mould by described key is except described caching server group's number, searches the group number of the described data cached master cache server zone that deposits in.
According to one embodiment of present invention, in described step S32, remove the quantity of the caching server node in described master cache server zone by the hash code mould of described key, search the node number of the described data cached master cache server node that deposits in.
According to one embodiment of present invention, described method also comprises step S5:
If inquire described data cachedly in described backup caching server group's backup caching server node, the data cached and described key that finds is cached in described master cache server node again.
According to one embodiment of present invention, described method also comprises S6: the described expired time that finds in data cached is written in described master cache server node.
as shown from the above technical solution, embodiments of the invention are by the corresponding with service device node in active and standby caching server group, make each data cached corresponding node that can be cached in a plurality of server zones, even the server of the cluster machine of delaying is arranged, can also find data cached in the server of this machine of delaying by other cluster corresponding node, thereby guarantee to be deposited into high reliability data cached in caching server, and this scheme is different from traditional active/standby server, different according to different data cached key, have different main cluster and node, so each node of each cluster is being born the service request of relative equilibrium, caching server is used fully, thereby improve the service quality of network.
Description of drawings
Fig. 1 is a kind of structured flowchart of caching system;
Fig. 2 is a kind of structured flowchart of improved caching system;
Fig. 3 is the structured flowchart of distributed cache system according to an embodiment of the invention;
Fig. 4 is the main flow chart of data cached wiring method according to an embodiment of the invention;
Fig. 5 is the main flow chart of data cached querying method according to an embodiment of the invention.
Embodiment
The below will describe specific embodiments of the invention in detail.Should be noted that the embodiments described herein only is used for illustrating, be not limited to the present invention.
Design of the present invention is to improve the framework between caching server and WEB server, and a plurality of caching servers are divided at least two server zones, will treat in the data cached corresponding node that is deposited into respectively in these at least two caching server groups of buffer memory.
According to one embodiment of present invention, the framework of distributed cache system of the present invention as shown in Figure 3, a plurality of caching servers are divided into m server zone, m＞1, namely can be divided into two server zones or plural server zone, and wherein have at least one server node in each bundle of services, each caching server group's caching server node each other can be identical, also can be different, as long as satisfying corresponding relation, the caching server node between each caching server group all can.The present invention is preferably has identical caching server node.Be m caching server group shown in Fig. 3, each caching server group's nodes is n, and wherein n is positive integer, and m caching server group's n caching server node be correspondence one by one each other, is used for storing identical data cached.
In the caching system of above-mentioned framework, a caching server group in a plurality of caching server groups can treat as certain the data cached master cache server zone of buffer memory, then the some caching server nodes in this master cache server zone can be further used as this data cached master cache server node, simultaneously other caching server group will be as this data cached backup caching server group, corresponding to the caching server node in other caching server group of master cache server node as data cached backup caching server node.
According to one embodiment of present invention, in conjunction with above-mentioned cache structure, the caching method of data of the present invention is:
S1: data cached in the master cache server node of at least two caching server groups' master cache server zone;
In this step S1, when data cached, according to one embodiment of present invention, can know as follows that these data treat the master cache server zone of buffer memory and master cache server node wherein, thereby the data that will treat buffer memory are deposited in the server node of knowing:
S101: according to the key of the data for the treatment of buffer memory, obtain the described data cached master cache server zone that will write.
Here be with the master cache server zone of a caching server group in described caching server group as the data for the treatment of buffer memory, and other caching server group is as this data cached backup caching server group;
According to one embodiment of present invention, obtaining the method for master cache server zone can be for carrying out computing with the group of the master cache server zone that obtains it and will write number according to data cached key.Key described here can be data cached URL (URL(uniform resource locator)), for example, when content of pages was cached to caching server, URL that this content of pages is corresponding address obtained according to this URL the master cache server zone that content of pages will deposit in as key.
Compute mode described here can be carried out mould to caching server group's number for the hash code (Hash codes) with described key and be removed, and is also that mould removes m, thereby the remainder number obtains the group number of master cache server zone.
S102: according to the key of the data for the treatment of buffer memory, obtain the master cache server node that the described data for the treatment of buffer memory will write in the described master cache server zone that gets.
According to one embodiment of present invention, step S102 can be specially according to data cached key and carry out the node number that computing will write to obtain it, compute mode described here, can carry out mould to the quantity of caching server node for the hash code with described key removes, be also that mould removes n, thus the node number of the master cache server that the acquisition of remainder number will write.
S103: treat that with described the data of buffer memory and described key are deposited in the described master cache server node that gets.
According to one embodiment of present invention, of the present invention in time in the data cached master cache server node that is written to the described master cache server zone that gets, also to be write this data cached expired time simultaneously, if so that this does not data cachedly have accessed inquiry these data will be discharged within a certain period of time.
S2: treat that with described the data of buffer memory and described key deposit (can be for example asynchronous write) in described backup caching server group's backup caching server node;
Here treat that the data of buffer memory both had been deposited into the master cache server node of master cache server zone, also be deposited in the backup caching server node in backup caching server group, thereby data are cached in a plurality of nodes of a plurality of caching servers the inside simultaneously, even a server in the caching server group machine of delaying is arranged, can also find data by the server node in other caching server group in follow-up inquiry.
According to one embodiment of present invention, the master cache server node of master cache server zone has corresponding relation with backup caching server group's backup caching server node, such as has identical node number, certainly of the present inventionly also be not limited to this, can have different node numbers, as long as the caching server node of master cache server zone and the satisfied default rule of correspondence of backup caching server group's caching server node.
As shown in Figure 4, above-mentioned wiring method execution mode is:
2.a except number of clusters, the remainder number calculates the place cluster to client according to the hash code mould for the treatment of data cached key;
2.b except number of nodes, the remainder number calculates the place node to client according to the hash code mould for the treatment of data cached key;
2.c client will be treated data cached and described key
Put into the node that calculates, and in the data the inside for the treatment of buffer memory, expired time is write;
To treat that the data of buffer memory and described key put into other cluster corresponding node 2.d client is asynchronous;
Caching method corresponding to above-mentioned data, the present invention also provides a kind of data cached querying method, similarly, also in conjunction with above-mentioned cache structure, this querying method is data cached for searching in the master cache server node of at least two caching server groups' master cache server zone, if do not find, search data cached in backup caching server group's backup caching server node.
According to one embodiment of present invention, this querying method is specially:
S11: according to data cached key to be checked, search the described data cached master cache server zone that deposits in;
The same with wiring method, hash code mould that can be by the data cached key that will inquire about is except described caching server group's number, searches the group number of the described data cached master cache server zone that deposits in.
S12: according to described key, search the described data cached master cache server node that deposits in the described master cache server zone that finds;
The same with wiring method, hash code mould that can be by described key is except the quantity of the caching server node in described caching server group, searches the node number of the master cache server node that described data deposit in.
S13: described data cached at the described caching server querying node that finds according to described key, if find, directly return to the data that find, otherwise change in step S14;
S14: inquiry is described to be checked data cached in described backup caching server group's backup caching server node, if find, in the data cached described caching server node that is put back into master cache server zone described in step S12 that finds;
Because the backup caching server node and the master cache server node that back up the caching server group have corresponding relation, such as they have identical node number, thereby can not find data cached when middle at the master cache server node, can transfer to search from backup caching server node, guarantee data cached reliability.
According to one embodiment of present invention, in the time of in the data cached described caching server node that is put back into described master cache server zone that will find in step S14, also simultaneously the described expired time that finds in data cached is written in the described caching server node of described master cache server zone.
Referring to Fig. 5, an execution mode of above-mentioned querying method is:
3.a except number of clusters, the remainder number calculates the place cluster to client according to the hash code mould of data cached key to be checked;
3.b except number of nodes, the remainder number calculates the place node to client according to the hash code mould of data cached key to be checked;
3.c the querying node that client will calculate according to data cached key to be checked;
3.d if can not find, client will be inquired about (as inquiry successively) other cluster corresponding node;
3.e after finding, client will find data cachedly is put back into the described node that calculates, expired time is obtained from this data cached value;
Can greatly improve the reliability of buffer memory according to data cached method of the present invention, because each is data cached, all be cached to the corresponding node of a plurality of clusters the inside, even the server of the cluster machine of delaying is arranged, can also have found by other cluster corresponding node the data of buffer memory.The different data for the treatment of buffer memory have different main cluster and host node, for example the hash code mould division result according to the key of the different data for the treatment of buffer memory is different, different main cluster and host node can be set, so each node of each cluster is being born the service request of relative equilibrium, and server is used fully.
Although described the present invention with reference to several exemplary embodiments, should be appreciated that term used is explanation and exemplary and nonrestrictive term.The spirit or the essence that do not break away from invention because the present invention can specifically implement in a variety of forms, so be to be understood that, above-described embodiment is not limited to any aforesaid details, and should be in the spirit and scope that the claim of enclosing limits explain widely, therefore fall into whole variations in claim or its equivalent scope and remodeling and all should be the claim of enclosing and contain.
Claims (7)
1. distributed cache system comprises:
At least two caching server groups;
Wherein each caching server group has at least one caching server node;
A caching server group in wherein said at least two caching server groups and a caching server node in this caching server group are respectively as data cached master cache server zone and master cache server node, and other caching server group and one of them caching server node are as described data cached backup caching server group and backup caching server node;
Wherein said master cache server node and described backup caching server node have identical data cached;
Wherein, described master cache server zone carries out mould to described at least two caching server groups' number respectively according to the Hash codes of described data cached key to be determined except the remainder number, and described master cache server node carries out mould according to the Hash codes of described data cached key to the number of the caching server node in described master cache server zone and determined except the remainder number.
2. system according to claim 1, wherein, described backup caching server node and described master cache server node have corresponding relation.
3. the caching method of data wherein, comprises the following steps:
S1: data cached in the master cache server node of at least two caching server groups' master cache server zone;
S2: with described data buffer storage in backup caching server group's backup caching server node;
Wherein, described step S1 comprises:
S101: according to the key of described data, described at least two caching server groups' number is carried out mould except the remainder number, obtain the master cache server zone that described data are treated buffer memory;
S102: according to the key of described data, the number of the caching server node in described master cache server zone is carried out mould except the remainder number, obtain the master cache server node that described data are treated buffer memory in described master cache server zone;
S103: described data and described key are cached in the described master cache server node that gets.
4. method according to claim 3, wherein, described method also comprises: when the described data of buffer memory, write the expired time of described data.
5. the data cached method of the described method of inquiry according to claim 3 or 4 an institute buffer memory wherein, comprises the following steps:
S3: search data cached at least in the master cache server node of two caching server groups' master cache server zone;
S4: if do not find, search data cached in backup caching server group's backup caching server node;
Wherein, described step S3 comprises:
S31: according to data cached key to be checked, by the Hash codes mould of described key being removed described caching server group's number, search the described data cached master cache server zone that deposits in;
S32: remove the quantity of the caching server node in described master cache server zone according to the Hash codes mould of described key, search the described data cached master cache server node that deposits in the described master cache server zone that finds;
S33: described data cached in the described master cache server node inquiry that finds according to described key, if find, directly return to find data cached.
6. method according to claim 5 wherein, also comprises step S5:
If inquire described data cachedly in described backup caching server group's backup caching server node, the data cached and described key that finds is cached in described master cache server node again.
7. method according to claim 6 wherein, also comprises step S6: find data cached expired time and be written in described master cache server node described.
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