CN107707643A - A kind of method and device updated the data in data-storage system - Google Patents
A kind of method and device updated the data in data-storage system Download PDFInfo
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- CN107707643A CN107707643A CN201710889795.XA CN201710889795A CN107707643A CN 107707643 A CN107707643 A CN 107707643A CN 201710889795 A CN201710889795 A CN 201710889795A CN 107707643 A CN107707643 A CN 107707643A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/561—Adding application-functional data or data for application control, e.g. adding metadata
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/18—File system types
- G06F16/182—Distributed file systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/23—Updating
- G06F16/2365—Ensuring data consistency and integrity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
Abstract
The invention discloses the method, apparatus of the method and device updated the data in data-storage system, node device and storage medium, the method and device that is updated the data in data-storage system, the management node for storing cluster receives the file renewal request that user sends;The management node of the storage cluster checks the metadata copy state of the file, if the copy state of the metadata is unlocked, carries out file renewal, and the copy state of the metadata is revised as locking, and prevents other renewal requests;So that it is guaranteed that the copy consistency in cloud storage system.
Description
Technical field
The present invention relates to a kind of method updated the data in the field of computer technology, more particularly to data-storage system and
Device.
Background technology
P2P is writing a Chinese character in simplified form for Peer-to-Peer, and be otherwise known as peer to peer technology.That service of P2P independent of concentration
Device, and it is to rely on all machines participated in P2P networks.From the point of view of the structure of system, P2P systems are distributed knots
Structure, it is different from the structure of centralization or the structure based on server.Because it not against with some network in it is genuinely convinced
Business device node provides index service, between any two machines in network can directly establish connection shared resource, and
It can be found that the various services in P2P systems.Compared with client server architecture, P2P key advantages are that it is whole
The service that system provides is distributed in each peer node in system, and thus single-point event is just not present in whole P2P systems
The risk of barrier.
P2P network architecture includes three kinds of catalogue centralized structure, pure P2P network structures, Composite Network Architecture etc.:
(1) catalogue centralized structure;A central directory service in the system of catalogue centralized structure be present, the LIST SERVER is responsible for
Preserve the index information of each node, such as address of node, the metadata such as resource of storage.(2) pure P2P network structures;It is pure
P2P networks, eliminate the central directory server of concentration, and the equity completely of each node in network, any one user is
It is randomly to be linked into P2P networks, and using the one group neighbor node adjacent with oneself of connection end to end logically
Form an overlay network.(3) Composite Network Architecture;Composite Network Architecture is by both centralized P2P and pure P2P networks
With reference to Composite Network Architecture.Node in Composite Network Architecture system is present in the form of cluster, and a cluster is by one
Individual index node and multiple ordinary nodes composition near it, in each cluster, index node takes as the central directory of cluster
Business device, other ordinary nodes are responsible for the storage of resource.
As the unlatching of the continuous fast development, especially Web2.0 epoch of the technologies such as mobile Internet, the whole world are numerous mutually
The various data of on-line customer's production increase while explosion type is presented.Internet data center counts global data volume in 2015 just
Reach 8ZB, 35ZB is more up to the year two thousand twenty.The mass data of world production generates huge demand to storage, is
Solves the storage demand of the high-performance of mass data, low cost and high safety reliability, cloud storage technology is arisen at the historic moment, compared
In traditional memory technology, not only it is capable of the storage mass data of low cost, and more simply and efficiently can stores and manage
Manage data.Cloud storage effectively solves the bottleneck of conventional storage technologies.
The cloud storage system (GFS containing Google, Amazon S3 and the HDFS to increase income) of main flow has used master-slave mode at present
System architecture, i.e. system by center host node and multiple formed from node.Wherein most typically is exactly GFS, its system
By a host node GFS master server and multiple from node GFS data block servers.And generally GFS master servers only have one,
Once the host node GFS master servers in cloud storage system break down, the paralysis of whole system will be caused.Even if can in system
Multiple-node backup technology can be used, but it is still without the Centroid of metadata high concentration in fundamentally solution system
Single Point of Faliure hidden danger.
The content of the invention
The embodiment of the present invention provides the method and device updated the data in a kind of data-storage system, it is intended to solves single-point event
The risk of barrier.
In a first aspect, a kind of method of the method and device updated the data in data-storage system, methods described include:
The management node for storing cluster receives the file renewal request that user sends;
The management node of the storage cluster checks the metadata copy state of the file, if the copy shape of the metadata
State is unlocked, then carries out file renewal, and the copy state of the metadata is revised as locking, and prevents other renewals please
Ask.
Alternatively, methods described also includes:
If failing to obtain the lock of the metadata, the file renewal request enters in the queue of a renewal request,
Current renewal is waited to complete.
Alternatively, the progress file renewal, including:
It is described storage cluster management node to directly before after the order that lock file copy is sent with immediate successor;
Wherein, it is described directly before after storage cluster N i-1 be:So that clockwise for positive direction, each node N is arranged in it
Before or after node, wherein the node come above is referred to as the preceding after after the direct of referred to as node before first of node N
It is preceding after N i-1;
The immediate successor stores cluster N i+1:The node come behind is referred to as the follow-up of node N, and first follow-up
Referred to as node N immediate successor.
Alternatively, methods described also includes:
The management node of the storage cluster returns to the metadata of the file to user, update the metadata of the file with
And version number.
Alternatively, methods described also includes:
It is described directly before after being updated with the immediate successor according to updated copy on the storage cluster.
Alternatively, it is described directly before after being updated with the immediate successor according to updated copy on the storage cluster,
Including:
After writing lock of duplicate of the document is updated when the user has obtained, first its former copy is updated;
If after being updated successfully, at the same update it is described directly before after with the immediate successor storage cluster on redundant copy;
Renewal completion message is sent to the management node of the storage cluster after each Replica updating success, then updates the member
Data and its version number.
Alternatively, methods described also includes:
NWR game theory is read and write according to storage system Replica updating, after all storage cluster renewal requests perform, tripartite
As long as copy wherein has two parts of Replica updating successes, it is determined that is updated successfully, duplicate of the document is unlocked.
Alternatively, methods described also includes:
If only having certain portion to fail to complete data renewal in tripartite's copy, the management node of the storage cluster will periodically
The method and device updated the data in data-storage system, untill being updated successfully.
According to the method for claim 7, it is characterised in that methods described also includes:
If it is described directly before after and the immediate successor on redundant copy be not all updated successfully, return to former copy
Version, while the information to fail is updated to user feedback.
Second aspect, a kind of device of the method and device updated the data in data-storage system, described device include:
Receiving module, the file for receiving user's transmission update request;
Update module, for checking the metadata copy state of the file, if the copy state of the metadata is not
Locking, then file renewal is carried out, and the copy state of the metadata is revised as locking, prevent other renewal requests.
The embodiments of the invention provide the method and device updated the data in a kind of data-storage system, the management of cluster is stored
Node receives the file renewal request that user sends;The management node of the storage cluster checks the metadata copy shape of the file
State, if the copy state of the metadata is unlocked, file renewal is carried out, and the copy state of the metadata is changed
For locking, other renewal requests are prevented;So that it is guaranteed that the copy consistency in cloud storage system.
Brief description of the drawings
Fig. 1 is the structural representation of P2P in the embodiment of the present invention one a kind of;
Fig. 2 is that the method for the method and device updated the data in a kind of data-storage system in the embodiment of the present invention two is shown
It is intended to;
Fig. 3 is the device of the method and device updated the data in a kind of data-storage system of three kinds of the embodiment of the present invention
High-level schematic functional block diagram;
Fig. 4 is a kind of hardware architecture diagram for node device that the embodiment of the present invention four provides.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that in order to just
Part related to the present invention rather than entire infrastructure are illustrate only in description, accompanying drawing.
Embodiment one
As shown in figure 1, the peering structure in P2P network topologies, according to the elementary cell characteristic of equity, is broadly divided into all
The complete peering structure of node and the peering structure based on storage cluster for unit.
It is all services for being used to store in cloud storage based on the complete equity in complete reciprocity cloud storage model
Device node forms a loop configuration, is all equality between each node, without hierarchical relationship.Clothes are stored in the loop configuration
It is engaged on device node, has both been responsible for storage file data and the metadata of these file datas, while store the route of correlation again
Data, its system architecture are distributed hashtable (DHT) networks, and it uses uniformity hash algorithm, by all compositions
The server apparatus of cloud storage network is mapped on a hash space by hash function, and the hash space joins end to end abstract
For ring.In based on complete reciprocity cloud storage model, each storage server for forming cloud storage system is to be mapped
For Chord rings, (Chord is most simple, most exactly circular P2P models, is the one of DHT (Distributed Hash Table)
It is kind classical to realize) on a node, each storage server is a self-government node for being capable of small range route, this
The structure of sample make it that the node that is mapped on Chord rings is excessive, is unfavorable for managing and route.Moreover, the one of cloud storage system
As in access process, user will be far longer than the visit for file content for the visiting frequency of file metadata and route data
Ask frequency.Each node safeguards the local data block of low frequency access and provides the routing function of high frequency access, node tasks simultaneously
Complexity, both are put together to the performance for being unfavorable for raising system.
It is the optimization on complete peering structure basis based on the peering structure that storage cluster is unit.In this configuration, will
It is responsible for the file metadata of high frequency access and safeguards function for routing iinformation data, concentrates depositing by higher performance
The management node for storing up cluster provides;And the data block server of common performance will play the part of the copy data for safeguarding that rather low-frequency accesses.
Two kinds of big types are divided into based on the server in storage cluster peering structure model:It is high performance storage cluster management server and
The data block storage server of common performance.In each storage cluster, the major function of its management node is user profile
The metadata such as the mapping between certification, the catalogue for safeguarding storage cluster and file and data block server, and data block server
It is to be used to store user file data.According in cloud storage system the characteristics of data access, by for the data of route, file
The hot spot datas such as metadata are concentrated, and transfer to higher performance server process, are advantageous to preferably improve the performance of system, are stored cluster
Between use structured P 2 P network topological structure, formed a DHT network.
In addition, for data block server, according to the degree of reliability, it is divided into believable data block server node again
(Reliable Chunk Server Node, abbreviation RCSN, RN) and incredible data block server node (Unreliable
Chunk Server Node, abbreviation UCSN, UN).Believable data block server node (Reliable Chunk Server
Node, abbreviation RCSN) server of high reliability that is mainly provided by cloud storage service business forms.RCSN is responsible for user in system
The storage of data, each RCSN by storage cluster management node management.Because RCSN reliabilities are high, the data being stored in RCSN
Relative reliability, availability are just higher, so it is reliability and available in cloud storage system that user data, which is stored on RCSN,
One of important guarantee of property.Incredible data block server node (Unreliable Chunk Server Node, abbreviation
UCSN) be mainly user machine form.Because the general reliability of user's machine can not be guaranteed, so in cloud storage model
Assuming that the data being stored in UCSN do not ensure its reliabilty and availability.
Embodiment two
With reference to figure 2, the present embodiment is applicable to method and the dress updated the data in the data-storage system of cloud storage system
Situation about putting, the device can realize that the device can be integrated in the management node of storage cluster by the way of software and/or hardware.
This method specifically includes:
Step 210, the management node for storing cluster receives the file renewal request that user sends;
Step 220, the management node of the storage cluster checks the metadata copy state of the file, if the metadata
Copy state to be unlocked, then carry out file renewal, and the copy state of the metadata is revised as locking, prevent other
Renewal request;
Wherein, the progress file renewal, including:
It is described storage cluster management node to directly before after the order that lock file copy is sent with immediate successor;
Wherein, it is described directly before after storage cluster N i-1 be:So that clockwise for positive direction, each node N is arranged in it
Before or after node, wherein the node come above is referred to as the preceding after after the direct of referred to as node before first of node N
It is preceding after N i-1;
The immediate successor stores cluster N i+1:The node come behind is referred to as the follow-up of node N, and first follow-up
Referred to as node N immediate successor.
Alternatively, methods described also includes:
If failing to obtain the lock of the metadata, the file renewal request enters in the queue of a renewal request,
Current renewal is waited to complete.
Alternatively, the management node of the storage cluster returns to the metadata of the file to user, updates the file
Metadata and version number.
Alternatively, methods described also includes:
It is described directly before after being updated with the immediate successor according to updated copy on the storage cluster.
Wherein, it is described directly preceding after being updated with the immediate successor according to updated copy on the storage cluster, wrap
Include:
After writing lock of duplicate of the document is updated when the user has obtained, first its former copy is updated;
If after being updated successfully, at the same update it is described directly before after with the immediate successor storage cluster on redundant copy;
Renewal completion message is sent to the management node of the storage cluster after each Replica updating success, then updates the member
Data and its version number.
Alternatively, methods described also includes:
NWR game theory is read and write according to storage system Replica updating, after all storage cluster renewal requests perform, tripartite
As long as copy wherein has two parts of Replica updating successes, it is determined that is updated successfully, duplicate of the document is unlocked.
Alternatively, methods described also includes:
If only having certain portion to fail to complete data renewal in tripartite's copy, the management node of the storage cluster will periodically
The method and device updated the data in data-storage system, untill being updated successfully.
Alternatively, methods described also includes:
If it is described directly before after and the immediate successor on redundant copy be not all updated successfully, return to former copy
Version, while the information to fail is updated to user feedback.
Exemplary, the renewal request of some file is initiated in (1), user;
(2) after, the management node of respective stored cluster receives request, the management node for storing cluster checks associated documents member number
According to copy state, in order to prevent multi-user while change the metadata of file, need to obtain the data when user changes data
On Read-Write Locks in write lock.If metadata is unlocked, then mean that no other users are changing the data, this
Secondary renewal request can be carried out, and the associated metadata of file is locked, and prevent other renewal requests.Carry out following processing simultaneously
Process:
A, redundant copy metadata is locked.The management node of the storage cluster to its directly before after sending locking with immediate successor
The order of this document copy;
B, the management node of the storage cluster returns to file metadata information to user, and user updates this document data, system
It is updated simultaneously about metadata, such as more new version number;
C, directly before after being updated with immediate successor using updated copy on the storage cluster.Two storage cluster renewals
Process carry out simultaneously.After writing lock of duplicate of the document is updated when user has obtained, its former copy is updated first, such as
After fruit is updated successfully, at the same update directly before after with immediate successor storage cluster on redundant copy.Each Replica updating success is backward
It stores the management node of cluster and sends renewal completion message, then stores the management node of cluster and will update its metadata and its version
Number.
D, according to NWR (read-write of storage system Replica updating) game theory, after all storage cluster renewal requests perform, three
As long as square copy wherein has two parts of Replica updating successes, you can thinks to be updated successfully, duplicate of the document is unlocked, now to this document
Other renewal requests can be processed.If only having certain portion to fail to complete data renewal in tripartite's copy, it stores cluster
Management node will periodically go to update the data, untill being updated successfully.If directly before after with it is superfluous on immediate successor
Remaining copy is not all updated successfully, the version of rollback original copy, while the information of failure is updated to user feedback.
(3) if, second step fail obtain associated documents metadata lock, then the request can enter one renewal please
Ask in queue, wait current renewal to complete.
Embodiment three
With reference to figure 3, the present embodiment is applicable to the various method and devices for being used in data-storage system update the data
The situation of device, this method can be performed by device provided in an embodiment of the present invention, and the device can use software and/or hardware
Mode realize that the device can be integrated in any equipment for realizing data renewal, such as management node etc. of storage cluster is such as schemed
Shown in 3, the device includes:
Receiving module 310, the file for receiving user's transmission update request;
Update module 320, for checking the metadata copy state of the file, if the copy state of the metadata is
It is unlocked, then file renewal is carried out, and the copy state of the metadata is revised as locking, prevent other renewal requests.
The device of the annotation of display content described in the present embodiment is used to perform the display content described in the various embodiments described above
Annotation method, its technical principle is similar with caused technique effect, repeats no more here.
Example IV
Fig. 4 is a kind of hardware architecture diagram for node device that the embodiment of the present invention four provides, as shown in figure 4, this hair
The node device that bright example IV provides, including one or more processors 42;
Storage device 43, for storing one or more programs.The node device passes through radio frequency day with other node devices
Line 41 realizes and communicated that radio-frequency antenna 41 is connected with processor 42 and storage device 43 respectively, and processor 42 and storage fill
Put and connected by bus or other means.In Fig. 4, the number of radio-frequency antenna 41 and processor 42 is 1.
Storage device 43 in the node device is used as a kind of computer-readable recording medium, available for storage one or more
Individual program, described program can be software program, computer executable program and module, as data are deposited in the embodiment of the present invention
Programmed instruction/module corresponding to the method for the method and device updated the data in storage system (for example, shown in accompanying drawing 3 it is wireless from
Module in the means for anti-jamming of networking, including:Interferometry unit 110, data processing unit 120, result transmitting element
130).Processor 42 is stored in software program, instruction and module in storage device 43 by operation, is set so as to perform node
Standby various function application and data processing, that is, realize what is updated the data in the data-storage system in above method embodiment
The method of method and device.
Storage device 43 may include storing program area and storage data field, wherein, storing program area can storage program area,
Application program needed at least one function;Storage data field can store uses created data etc. according to equipment.In addition,
Storage device 43 can include high-speed random access memory, can also include nonvolatile memory, for example, at least a magnetic
Disk storage device, flush memory device or other non-volatile solid state memory parts.In some instances, storage device 43 can enter one
Step includes that relative to the remotely located memory of processor 42, these remote memories network connection to equipment can be passed through.On
The example for stating network includes but is not limited to internet, intranet, LAN, mobile radio communication and combinations thereof.
Also, when one or more program included by above-mentioned node device is held by one or more of processors 42
During row, program proceeds as follows:
The management node for storing cluster receives the file renewal request that user sends;
The management node of the storage cluster checks the metadata copy state of the file, if the copy shape of the metadata
State is unlocked, then carries out file renewal, and the copy state of the metadata is revised as locking, and prevents other renewals please
Ask.
In addition, the embodiment of the present invention also provides a kind of computer-readable recording medium, computer program is stored thereon with, should
Program controlled device realizes the method for the data renewal that the embodiment of the present invention two or embodiment three provide, this method bag when performing
Include:The management node for storing cluster receives the file renewal request that user sends;
The management node of the storage cluster checks the metadata copy state of the file, if the copy shape of the metadata
State is unlocked, then carries out file renewal, and the copy state of the metadata is revised as locking, and prevents other renewals please
Ask.
By the description above with respect to embodiment, it is apparent to those skilled in the art that, the present invention
It can be realized by software and required common hardware, naturally it is also possible to realized by hardware, but the former is more in many cases
Good embodiment.Based on such understanding, what technical scheme substantially contributed to prior art in other words
Part can be embodied in the form of software product, and the computer software product can be stored in computer-readable recording medium
In, floppy disk, read-only storage (Read-Only Memory, ROM), random access memory (Random such as computer
Access Memory, RAM), flash memory (FLASH), hard disk or CD etc., including some instructions are causing a computer to set
Standby (can be personal computer, server, or network equipment etc.) performs the method described in each embodiment of the present invention.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of method of the method and device updated the data in data-storage system based in cloud storage system, its feature exist
In methods described includes:
The management node for storing cluster receives the file renewal request that user sends;
The management node of the storage cluster checks the metadata copy state of the file, if the copy state of the metadata is
It is unlocked, then file renewal is carried out, and the copy state of the metadata is revised as locking, prevent other renewal requests.
2. according to the method for claim 1, it is characterised in that methods described also includes:
If failing to obtain the lock of the metadata, the file renewal request enters in the queue of a renewal request, waited
Current renewal is completed.
3. method according to claim 1 or 2, it is characterised in that the progress file renewal, including:
It is described storage cluster management node to directly before after the order that lock file copy is sent with immediate successor;
Wherein, it is described directly before after storage cluster N i-1 be:So that clockwise for positive direction, each node N has arrangement before it
Or node afterwards, wherein the node come above be referred to as node N it is preceding after, before first after referred to as node it is direct before after
N i-1;
The immediate successor stores cluster N i+1:The node come behind is referred to as the follow-up of node N, and first follow-up to be referred to as
Node N immediate successor.
4. method according to claim 1 or 2, it is characterised in that methods described also includes:
The management node of the storage cluster returns to the metadata of the file to user, updates the metadata and version of the file
This number.
5. according to the method for claim 3, it is characterised in that methods described also includes:
It is described directly before after being updated with the immediate successor according to updated copy on the storage cluster.
6. according to the method for claim 5, it is characterised in that it is described directly before after with the immediate successor according to the storage
Updated copy is updated on cluster, including:
After writing lock of duplicate of the document is updated when the user has obtained, first its former copy is updated;
If after being updated successfully, at the same update it is described directly before after with the immediate successor storage cluster on redundant copy;
Renewal completion message is sent to the management node of the storage cluster after each Replica updating success, then updates the metadata
And its version number.
7. method according to claim 1 or 2, it is characterised in that methods described also includes:
NWR game theory is read and write according to storage system Replica updating, after all storage cluster renewal requests perform, tripartite's copy
As long as wherein there are two parts of Replica updating successes, it is determined that be updated successfully, duplicate of the document is unlocked.
8. according to the method for claim 7, it is characterised in that methods described also includes:
If only having certain portion to fail to complete data renewal in tripartite's copy, the management node of the storage cluster is by periodic data
The method and device updated the data in storage system, untill being updated successfully.
9. according to the method for claim 7, it is characterised in that methods described also includes:
If it is described directly before after and the immediate successor on redundant copy be not all updated successfully, return to the version of former copy
This, while the information to fail is updated to user feedback.
10. the device of the method and device updated the data in a kind of data-storage system, it is characterised in that described device includes:
Receiving module, the file for receiving user's transmission update request;
Update module, for checking the metadata copy state of the file, if the copy state of the metadata is unlocked,
File renewal is then carried out, and the copy state of the metadata is revised as locking, prevents other renewal requests.
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CN103561057A (en) * | 2013-10-15 | 2014-02-05 | 深圳清华大学研究院 | Data storage method based on distributed hash table and erasure codes |
US20170078383A1 (en) * | 2015-09-14 | 2017-03-16 | Microsoft Technology Licensing, Llc | Hosted file sync with stateless sync nodes |
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