CN109726212A - Data-storage system and method - Google Patents
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Abstract
It includes client, data server cluster, N number of meta data server group that the application, which provides a kind of data-storage system and method, system,；Client is used to select a meta data server group from N number of meta data server group according to the Data Identification of data to be written and sends write request to the meta data server group；The target data server that the server identification for including to metadata information when receiving the metadata information of meta data server group return is directed toward sends data to be written；Every meta-data server group is used to determine metadata information for the write request received, stores metadata information and return to client；Each data server is for storing the data to be written received in cluster.By using the mode of multiple meta data server groups, avoid all data writes the problem of all being handled by a meta data server, breaches the bottleneck of single meta data server, can expand client scale and cluster scale that storage system has access to.
Description
Technical field
This application involves technical field of data storage more particularly to a kind of data-storage system and methods.
Background technique
Current distributed memory system is made of client, a meta data server and data server cluster.
Client first initiates write request, the comprehensive entire data server collection of meta data server to meta data server when writing data
The factors such as loading condition, the free space of group, the metadata information of decision write request, metadata information include the data clothes of write-in
Be engaged in device and the role (one of as primary copy role, other as standby copy role) of these data servers, storage
Metadata information that decision goes out simultaneously is sent to client, and client will write data and be sent to data service as primary copy role
Device is completed the write-in for writing data by the data server of primary copy role, while will be write data and be sent to as standby copy role
Data server storage, the data server of last primary copy role returns to write-in result to client.
Since the write-in of all data of all clients in distributed memory system is required through single metadata
Server realizes that therefore meta data server readily becomes bottleneck so that client terminal quantity that storage system has access to and
Data server quantity is restricted.
Summary of the invention
In view of this, the application provides a kind of data-storage system and method, to solve the relevant technologies to storage system energy
The problem of client terminal quantity and data number of servers enough accessed is restricted.
According to the embodiment of the present application in a first aspect, provide a kind of data-storage system, the system comprises client and
Data server cluster, the system also includes N number of meta data server groups；
The client, for selecting one from N number of meta data server group according to the Data Identification of data to be written
A meta data server group, and write request is sent to the meta data server group of selection；Receiving the meta data server
When the metadata information that group returns, the target data server that the server identification that Xiang Suoshu metadata information includes is directed toward is sent
The data to be written；
Every meta-data server group in N number of meta data server group, for the write request determination to receive
Metadata information, the metadata information include the server identification of the data to be written target data server to be written, at this
Ground stores the metadata information and returns to the client；
Each data server in the data server cluster, for storing the data to be written received.
According to the second aspect of the embodiment of the present application, a kind of date storage method is provided, the method is applied to above-mentioned the
System described in one side, which comprises
Client selects a metadata clothes according to the Data Identification of data to be written from N number of meta data server group
Business device group, and write request is sent to the meta data server group of selection；
The meta data server group is that the write request determines metadata information, the metadata information include it is described to
The server identification for writing the target data server that data to be written is being locally stored the metadata information and is returning to described
Client；
The target data server that the server identification that the client includes to the metadata information is directed toward sends institute
State data to be written；
The target data server stores the data to be written.
Using the embodiment of the present application, by using the mode of multiple meta data server groups, client, can when writing data
To select a meta data server group from all meta data server groups according to the Data Identification of data to be written, and by selecting
Meta data server group carry out decision metadata information and store so that each meta data server group is only recorded and is entirely deposited
The part metadata information of storage system, avoid all data writes the problem of all being handled by a meta data server, breaks through
Single meta data server bring bottleneck, so as to expanding the client scale and data service that storage system has access to
Device cluster scale.
Detailed description of the invention
Fig. 1 is a kind of the application existing distributed memory system structure chart shown according to an exemplary embodiment；
Fig. 2A is a kind of the application data storage system architecture figure shown according to an exemplary embodiment；
Fig. 2 B is a kind of redistribution schematic diagram of the application metadata information shown in A illustrated embodiment according to fig. 2；
Fig. 2 C is the Data Migration schematic diagram in the application according to fig. 2 a kind of data server shown in A illustrated embodiment；
Fig. 3 is a kind of the application embodiment flow chart of date storage method shown according to an exemplary embodiment.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects be described in detail in claims, the application.
It is only to be not intended to be limiting the application merely for for the purpose of describing particular embodiments in term used in this application.
It is also intended in the application and the "an" of singular used in the attached claims, " described " and "the" including majority
Form, unless the context clearly indicates other meaning.It is also understood that term "and/or" used herein refers to and wraps
It may be combined containing one or more associated any or all of project listed.
It will be appreciated that though various information, but this may be described using term first, second, third, etc. in the application
A little information should not necessarily be limited by these terms.These terms are only used to for same type of information being distinguished from each other out.For example, not departing from
In the case where the application range, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as
One information.Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination ".
Fig. 1 is a kind of the application existing distributed memory system structure chart shown according to an exemplary embodiment, such as
Shown in Fig. 1, the distributed memory system include client (can at least access a client), a meta data server and
Data server cluster (shows three data server As, B, C) in Fig. 1.Client is used to send read request to system or write
Request, meta data server are used to manage metadata information and handle the read-write requests of client, and data server cluster is used for
Storing data guarantees the availability and integrality of data.
Write data procedures for client: client first initiates write request to meta data server, and meta data server needs
The factors such as loading condition, the free space of entire data server cluster are integrated, for write request decision metadata information and are deposited
Storage, metadata information include that the role of the server identification and these data servers for the data server to be written is (therein
One is used as primary copy role, other as standby copy role), the metadata information that decision goes out is sent to client, client
End will write data again and be sent to data server as primary copy role, write number by the data server completion of primary copy role
While according to storage, data will be write and be sent to as the data server storage for copy role, the number of last primary copy role
Write-in result is returned to client according to server.
Due to all data write require to be handled by single meta data server in addition the reading of all data also
It needs to search metadata information by meta data server and be read out, therefore meta data server readily becomes bottleneck, makes
The client terminal quantity that has access to of storage system and data number of servers are restricted.
To solve the above problems, the application proposes a kind of data-storage system, if Fig. 2A is that the application is exemplary according to one
Implement a kind of data storage system architecture figure exemplified, the data-storage system includes client, data server cluster
And N number of meta data server group:
Client selects a member for the Data Identification according to data to be written from N number of meta data server group
Data server group, and write request is sent to the meta data server group of selection；It is returned receiving the meta data server group
When the metadata information returned, described in the target data server transmission that the server identification that Xiang Suoshu metadata information includes is directed toward
Data to be written；
Every meta-data server group in N number of meta data server group, for the write request determination to receive
Metadata information, the metadata information include the server identification of the data to be written target data server to be written, at this
Ground stores the metadata information and returns to the client；
Each data server in the data server cluster, for storing the data to be written received.
Wherein, it is the unique identification that data to be written generate that Data Identification, which is client, according to the Data Identification of data to be written
Hash algorithm or CRUSH algorithm can be used by selecting the process of meta data server group, for example, Data Identification is 10, first number
Quantity according to server group is 5, by by Data Identification 10 divided by the remainder 0 of meta data server group quantity 5 as selecting
The 0th meta data server group, i.e. meta data server group A in Fig. 2A.Meta data server group is that writing of receiving is asked
Seeking determining metadata information factor in need of consideration includes that the loading condition of entire data server cluster (is such as currently at online
The data server of state, data server and each data server in down status are in busy condition or free time
State etc.), the idle storage space of each data server etc..
In one example, metadata information is in addition to the server including the data to be written target data server to be written
It can also include role's (usually one of to be used as primary copy role, other works of each target data server except mark
For standby copy role), so that data to be written can be first sent to the data server progress as primary copy role by client
While storage, then data to be written are sent to the data server as standby copy role, to realize primary copy and standby copy
Storage.
In the present embodiment, by using the mode of multiple meta data server groups, client is when writing data, Ke Yigen
A meta data server group, and the member by selecting are selected from all meta data server groups according to the Data Identification of data to be written
Data server group is carried out decision metadata information and is stored, so that each meta data server group only records entire storage system
The part metadata information of system, avoid all data writes the problem of all being handled by a meta data server, breaches list
Meta-data server bring bottleneck, so as to expand the client scale and data server set that storage system has access to
Group's scale.
Every unitary number in an optional implementation, as shown in above-mentioned Fig. 2A, in N number of meta data server group
It may include metadata primary server and metadata for server according to server group, the metadata is for server for backing up institute
The metadata information of metadata primary server storage is stated, and when the metadata primary server breaks down, is switched to first number
The reliability of meta data server group is improved according to primary server to guarantee the normal operation of meta data server group.
It, can be in the metadata information that is determined in meta data server group for write request in an optional implementation
Including Data Identification, when ensuring client subsequent reads data, metadata can be found according to the Data Identification of data to be read
Information.Based on this, every meta-data server group in N number of meta data server group, can be also used for receiving it is outer
When the group mark of the newly-increased meta data server group of portion's input, the Data Identification for including according to the metadata information being locally stored is true
The fixed metadata information meta data server group to be migrated arrived, and the metadata information is migrated to determining Metadata Service
In device group.
Wherein, when increasing meta data server group in storage system newly, the metadata information needs in storage system are based on
Including Data Identification realize redistribution, to rebalance the metadata information in each meta data server group, for basis
Data Identification determines the principle of the metadata information meta data server group to be migrated arrived, is selected with client according to Data Identification
The principle of meta data server group is consistent, and the quantity for only participating in the meta data server group calculated includes newly-increased Metadata Service
Device group thereby may be ensured that subsequent client at the time of reading, even if metadata information had redistributed, according to data to be read
Data Identification can also determine the data server group where metadata information.
It should be noted that, although being needed in each meta data server group of decision after newly-increased meta data server group
The whereabouts of all metadata informations, but since the data volume of metadata information is far smaller than the data volume of user data,
Time spent by the redistribution process of metadata information is very short.
In an exemplary scene, as shown in Figure 2 B, schematic diagram, figure are redistributed for a kind of illustrative metadata information
Original meta data server group is A and B in 2B, and after newly-increased meta data server group C, meta data server group A and B pass through
After decision, the store in A the 4th metadata information A is moved in newly-increased meta data server group C, by what is stored in B
4th metadata information B has been moved in newly-increased meta data server group C.
In an optional implementation, every meta-data server group in N number of meta data server group may be used also
For determining each number in data server cluster when receiving the server identification of externally input newly-increased data server
The Data Identification of migrating data is needed according to server and is notified to each data server, and according to determining Data Identification and is increased newly
The server identification of data server updates the metadata information being locally stored；Each data in the data server cluster
Server can be also used for when receiving the Data Identification for needing migrating data, and the corresponding data of the Data Identification are moved
It moves in newly-increased data server.
Wherein, when increasing data server in storage system newly, the data server in storage system is needed part number
It migrates according to (i.e. user data) to newly-increased data server, with the data in balanced each data server.Metadata Service
It includes entire data server collection that device group, which determines that each data server needs the Data Identification of migrating data factor in need of consideration,
The loading condition of group (is such as currently at the data server of presence, data server and each number in down status
In busy condition or idle state etc. according to server), cold spot data and hot spot data distribution situation in each data server
Deng thus when data server cluster scale changes, can effectively controlling the scale of data redistribution, and can be with
More fine adjustment is made to the redistribution of data in conjunction with many factors.Further need exist for the utilization of meta data server group
The server identification of determining Data Identification and newly-increased data server updates metadata information, to guarantee that subsequent client is being read
Access according to when, even if migration occurred for the data, can also be read from data server according to updated metadata information
Out.
It is the Data Migration signal in a kind of illustrative data server as shown in Figure 2 C in an exemplary scene
Scheme, original data server has A, B, C in Fig. 2 C, and after newly-increased data server D, data server A will be 6th local
Into newly-increased data server D, the data in data server B do not migrate Data Migration, and in data server C
Five and the 6th data have moved in newly-increased data server D.
Fig. 3 is a kind of the application embodiment flow chart of date storage method shown according to an exemplary embodiment, institute
Date storage method is stated applied to system shown in above-mentioned Fig. 2A, the date storage method includes the following steps:
Step 301: client selects one according to the Data Identification of data to be written from N number of meta data server group
Meta data server group, and write request is sent to the meta data server group of selection.
Step 302: meta data server group is that the write request determines that metadata information, the metadata information include institute
The server identification for stating the target data server that data to be written to be written is being locally stored the metadata information and is returning to
Client.
Step 303: the target data server hair that the server identification that client includes to the metadata information is directed toward
Send the data to be written.
Step 304: target data server stores the data to be written.
For the process of above-mentioned steps 301 to step 302, the associated description of above-mentioned Fig. 2A illustrated embodiment may refer to,
It repeats no more.
In one embodiment, the metadata information when increasing meta data server group in storage system newly, in storage system
It needs to realize redistribution based on the Data Identification for including, to rebalance the metadata information in each meta data server group,
Specific distributed process are as follows: meta data server group receive externally input newly-increased meta data server group group mark when,
The metadata information meta data server to be migrated arrived is determined according to the Data Identification that the metadata information being locally stored includes
Group, and the metadata information is migrated into determining meta data server group.
Wherein, it may refer to the associated description of above-mentioned Fig. 2A illustrated embodiment for the detailed description of above-mentioned distributed process,
It repeats no more.
In one embodiment, when increasing data server in storage system newly, the data server in storage system needs
Partial data (i.e. user data) is migrated to newly-increased data server, with the data in balanced each data server, tool
Body balancing procedure are as follows: meta data server group is when receiving the server identification of externally input newly-increased data server, really
Determine each data server in data server cluster to need the Data Identification of migrating data and notify to each data server, and root
The metadata information being locally stored is updated according to the server identification of the Data Identification and newly-increased data server；Each data service
Device is when receiving the Data Identification for needing migrating data, by the corresponding Data Migration of the Data Identification to newly-increased data service
In device.
Wherein, it may refer to the associated description of above-mentioned Fig. 2A illustrated embodiment for the detailed description of above-mentioned balancing procedure,
It repeats no more.
In the embodiment of the present application, by using the mode of multiple meta data server groups, client, can be with when writing data
According to the Data Identification of data to be written select a meta data server group from all meta data server groups, and by selecting
Meta data server group is carried out decision metadata information and is stored, so that each meta data server group only records entire storage
The part metadata information of system, avoid all data writes the problem of all being handled by a meta data server, breaches
Single meta data server bring bottleneck, so as to expand the client scale and data server that storage system has access to
Cluster scale.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the application
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the application, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are by following
Claim is pointed out.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
It include so that the process, method, commodity or the equipment that include a series of elements not only include those elements, but also to wrap
Include other elements that are not explicitly listed, or further include for this process, method, commodity or equipment intrinsic want
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including described want
There is also other identical elements in the process, method of element, commodity or equipment.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (7)
1. a kind of data-storage system, the system comprises clients and data server cluster, which is characterized in that the system
It further include N number of meta data server group；
The client selects a member for the Data Identification according to data to be written from N number of meta data server group
Data server group, and write request is sent to the meta data server group of selection；It is returned receiving the meta data server group
When the metadata information returned, described in the target data server transmission that the server identification that Xiang Suoshu metadata information includes is directed toward
Data to be written；
Every meta-data server group in N number of meta data server group, for the determining first number of write request to receive
It is believed that breath, the metadata information includes the server identification of the data to be written target data server to be written, and is deposited locally
It stores up the metadata information and returns to the client；
Each data server in the data server cluster, for storing the data to be written received.
2. system according to claim 1, which is characterized in that each metadata in N number of meta data server group
Server group includes metadata primary server and metadata for server, and the metadata is for server for backing up first number
According to the metadata information that primary server stores, and when the metadata primary server breaks down, it is switched to the main clothes of metadata
Business device.
3. system according to claim 1, which is characterized in that the metadata information further includes Data Identification；
Every meta-data server group in N number of meta data server group is also used to receiving externally input increase newly
When the group mark of meta data server group, determine that the metadata is believed according to the Data Identification that the metadata information being locally stored includes
The meta data server group to be migrated arrived is ceased, and the metadata information is migrated into determining meta data server group.
4. system according to claim 1, which is characterized in that each metadata in N number of meta data server group
Server group is also used to determine data server when receiving the server identification of externally input newly-increased data server
Each data server needs the Data Identification of migrating data and notifies to each data server, and according to the data mark in cluster
Know and the server identification of newly-increased data server updates the metadata information being locally stored；
Each data server in the data server cluster is also used to receiving the Data Identification for needing migrating data
When, by the corresponding Data Migration of the Data Identification into newly-increased data server.
5. a kind of date storage method, which is characterized in that the method is applied to that the claims 1-4 is any described to be
System, which comprises
Client selects a meta data server according to the Data Identification of data to be written from N number of meta data server group
Group, and write request is sent to the meta data server group of selection；
The meta data server group is that the write request determines that metadata information, the metadata information include the number to be written
According to the server identification for the target data server to be written, the metadata information is being locally stored and is returning to the client
End；
The target data server that server identification that the client includes to the metadata information is directed toward send it is described to
Write data；
The target data server stores the data to be written.
6. according to the method described in claim 5, it is characterized in that, the metadata information further includes Data Identification, the side
Method further include:
The meta data server group is in the group mark for receiving externally input newly-increased meta data server group, according to local
The Data Identification that the metadata information of storage includes determines the metadata information meta data server group to be migrated arrived, and should
Metadata information is migrated into determining meta data server group.
7. according to the method described in claim 5, it is characterized in that, the method also includes:
The meta data server group determines data when receiving the server identification of externally input newly-increased data server
Each data server needs the Data Identification of migrating data and notifies to each data server, and according to described in server cluster
The server identification of Data Identification and newly-increased data server updates the metadata information being locally stored；
Each data server is when receiving the Data Identification for needing migrating data, by the corresponding Data Migration of the Data Identification
Into newly-increased data server.
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Application publication date: 20190507 |
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