CN115794766A - Data copy storage method, system, equipment and storage medium for distributed storage - Google Patents
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Abstract
The invention provides a data copy storage method, a system, equipment and a storage medium, wherein the method comprises the following steps: acquiring data information of a plurality of data centers in a seaweedfs system; judging whether the data information of the data center meets a first condition or not, judging whether the data information of the data center meets a second condition or not, determining the ordering of the data center according to the data information of the data center, and determining a target data center according to the ordering; and creating a copy of the target data center. The invention can realize reasonable placement and dynamic deletion of the data copy, expands the mechanism of the data copy and improves the storage efficiency of the file system.
Description
Technical Field
The present invention relates to the field of data storage technologies, and in particular, to a data copy storage method, system, device, and storage medium for distributed storage.
Background
With the development of information technology, various industries are undergoing digital transformation, and the generated data is explosively increased, so that the traditional storage technology of the centralized storage server cannot meet the requirement of large-scale storage application. The distributed network storage system adopts an expandable system structure, utilizes a plurality of storage servers to share storage load, and utilizes the position server to position storage information, thereby not only improving the reliability, the availability and the access efficiency of the system, but also being easy to expand.
SeaweedFS (name of open source distributed file, official network https:// githu. Com/SeaweedFS/SeaweedFS) is a simple, highly scalable wide area network distributed file system. SeaweedFS is a distributed storage open source project developed by the go language, which, regardless of the language used, can store billions of files and provides fast lookup of files.
In a computing cluster and a computing grid, a data replication technology is a very effective and feasible method in the aspects of improving data access bandwidth and data reliability, and a replication mechanism mainly focuses on 4 aspects: copy placement, copy selection, copy consistency, copy scheduling, different systems may exhibit different implementation strategies in these several respects for performance considerations. The copy mechanism of the SeaweedFS is at the volume (logical volume, logical structure storing data) level, rather than the file level.
For example, chinese patent publication No. CN104281506A discloses a data maintenance method for a file system, which includes backing up source data of a source data center to a copy data center as copy data of the source data; selecting the source data center to provide read-write service or the replica data center to provide the read-write service according to the state of the source data center; and updating the source data or the replica data according to the log file so as to ensure the data consistency of the source data center and the replica data center. However, in the case of multiple data centers in a wide area network, the above method merely selects the data centers in a random manner to establish copies, and does not consider the location of the data centers and the data hot degree condition, which results in low system storage efficiency.
For another example, chinese patent publication No. CN10446739A discloses a data copy placement method for Geo-distributed cloud storage, in which data centers in the cloud storage are distributed at different physical locations under a Geo-distributed environment, data migration costs among the data centers are mainly considered, access heat of the data copy in the period is predicted according to historical statistics, and then a coefficient of the data copy is calculated, and access heat of the data copy in each data center and a physical capability value of each data center are comprehensively considered, thereby achieving placement of the data copy. However, although the above method considers that the data copies are placed according to the access heat of each data center and the physical capability value of the data center itself, it does not consider other indexes such as free space, network performance, and the like, and lacks copy dynamic storage and deletion control, so the storage efficiency of the above method is low, and the above method is based on a certain data file, while the copy in seawebfs is based on volume, and cannot be directly applied to the copy in seawebfs.
Disclosure of Invention
The invention mainly aims to provide a data copy storage method, a data copy storage system, data copy storage equipment and a storage medium for distributed storage, and aims to realize reasonable placement and dynamic deletion of data copies, expand a data copy mechanism and improve the storage efficiency of a file system.
In order to realize the purpose, the invention adopts the following technical scheme:
a data copy storage method of distributed storage comprises the following steps:
acquiring data information of a plurality of data centers in a seaweedfs system;
judging whether the data information of the data center meets a first condition, wherein the first condition comprises that the copy creation number of the data center is larger than zero in first preset time, or the copy number of the data center exceeds a first threshold value;
if so, judging whether the data information of the data center meets a second condition, wherein the second condition is whether the retrieval access quantity of the files of the data center logical volume in second preset time reaches a second threshold value;
if yes, determining the sorting of the data centers according to the data information of the data centers, and determining a target data center according to the sorting;
and creating a copy of the target data center.
Further, in the above data copy storage method, the first preset time is 24 hours, and the first threshold is 4.
Further, in the above data copy storage method, the second preset time is 7 days, and the second threshold is 8.
Further, in the above data copy storage method, the step of determining the rank of the data center according to the data information of the data center specifically includes: and carrying out weighted sequencing on the plurality of data centers according to the available space, the bandwidth and the queuing file of the data centers.
Further, in the above data copy storage method, the data copy storage method further includes:
judging whether the retrieval access number of the copies of the data center in second preset time reaches a second threshold value, if so, not processing; and if not, deleting the copy of the data center.
In addition, the present invention also provides a data copy storage system, which includes:
the collection module is used for acquiring data information of a plurality of data centers in the seawebedfs system;
the first judgment module is used for judging whether the data information of the data center meets a first condition or not;
the second judgment module is used for judging whether the data information of the data center meets a second condition or not;
the determining module is used for determining the sequencing of the data centers according to the data information of the data centers and determining a target data center according to the sequencing;
and the execution module is used for creating a copy for the target data center.
Further, in the above data copy storage system, the system further includes:
the third judging module is used for judging whether the retrieval access number of the copies of the data center in second preset time reaches a second threshold value;
and the deleting module is used for deleting the copy of the data center under the condition that the retrieval access number of the copy of the data center in second preset time does not reach a second threshold value.
In addition, the present invention also provides a data copy storage device, including: the data copy storage method comprises a memory, a processor and a data copy storage program which is stored in the memory and can run on the processor, wherein the data copy storage program is configured to realize the steps of the data copy storage method.
In addition, the present invention also provides a storage medium, wherein the storage medium stores a data copy storage program, and the data copy storage program realizes the steps of the data copy storage method when being executed by a processor.
The data copy storage method, the system, the equipment and the storage medium for distributed storage can realize reasonable placement and dynamic deletion of the data copy, expand the mechanism of the data copy and improve the storage efficiency of a file system.
Drawings
FIG. 1 is a schematic view of the topology of SeaweedFS;
FIG. 2 is a schematic diagram of a data copy storage device of a hardware operating environment according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating an embodiment of a data copy storage method for distributed storage according to the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a distributed-storage data copy storage system according to the present invention.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a topology of SeaweedFS. The SeaweedFS is used as an object storage library to effectively process storage and access of mass data files in a wide area network environment, the SeaweedFS is designed to effectively store and process small files, and large files can be divided into blocks and split into small files to be uploaded. The metadata of all files is not stored in the Master node, but is dispersedly stored in the Volume (logical Volume, logical structure for storing data), the Master node only stores the mapping of the Volume ID to the Volume logical Volume, and therefore, the query pressure of the Master node is dispersed to the Volume node. The file Volume servers respectively manage respective metadata, and all file metadata stored on the Volume logical Volume can be read from a memory without accessing a disk. This reduces stress on the master node and network traffic in high concurrency situations, while locating files more quickly.
The data nodes DataNode are leaf nodes of a tree, the data centers DataNode and Rack (belonging to a data node DataNode, similar to a Rack in a machine room) are non-leaf nodes of the tree, the DataNode is a parent node of the Rack, and each time the corresponding DataNode is searched, the DataNode is sequentially searched from the DataNode- > Rack- > DataNode.
When an instance is started, the logical Volume creates a data node datanode, the affiliated datacenter rack and master can be specified, the logical Volume is not defaulted to have the logical Volume at the beginning according to the configuration storage file, the logical Volume is created when the storage file begins, a logical Volume is newly added when the size of the logical Volume exceeds the Volume SizeLimitMB, and the data node datanode cannot newly add data when the number of the logical Volume exceeds the threshold value max. Then a new data node datanode needs to be added through the weedvolume command.
The copy mechanism of SeaweedFS is implemented by creating the same logical Volume in different data centers, or different racks, or different servers. Specifically, at the time of master startup, the policy of the replica can be specified by the defaultReplication parameter (no replica is generated by default 000). For example, $ wend master-default replication =001, indicating that a copy of data is backed up in the same rack as the same data.
Its copy strategy is a number in xyz form, with the following meaning:
x number of copies in other data centers;
y number of copies of other racks in the same data center;
z number of copies of different servers in the same rack;
x, y, z may be 0,1,2, respectively, so there are 9 possible copy type combinations. Each copy type will create x + y + z +1 copies.
Such as:
000. only one copy is stored without backup;
001. copy one copy in the same Rack;
010. one copy is replicated in a different Rack, the same data center;
100. copying a copy in a different data center;
200. duplicate copies in different data centers;
110. one copy is replicated in a different Rack and one copy is replicated in a different data center.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a data copy storage device of a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 2, the data copy storage device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the architecture illustrated in FIG. 2 is not intended to be limiting of data replica storage devices, and may include more or fewer components than those illustrated, or some components may be combined, or a different arrangement of components.
As shown in fig. 2, the memory 1005, which is a storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and a data copy storage program.
In the data replica storage device shown in fig. 2, the network interface 1004 is mainly used for data communication with other devices; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 of the data copy storage device of the present invention may be disposed in the data copy storage device, and the data copy storage device calls the data copy storage program stored in the memory 1005 through the processor 1001 and executes the data copy storage method provided in the embodiment of the present invention.
An embodiment of the present invention provides a data copy storage method for distributed storage, and referring to fig. 3, fig. 3 is a schematic flow diagram of a first embodiment of the data copy storage method according to the present invention.
In this embodiment, the data copy storage method includes:
step S100: acquiring data information of a plurality of data centers in a seaweedfs system;
in the specific implementation, data information of different data centers is collected and used for the reallocation algorithm. The data information includes file access history information of the logical Volume, which is not limited to the data center, free space of the site, topology information, and network indexes.
Step S200: judging whether the data information of the data center meets a first condition or not; if yes, go to step S300; if not, returning to the step S100;
in a specific implementation, after obtaining data information of multiple data centers, the multiple data centers need to be judged and screened to determine when and where to create new copies. Ensuring the reasonable creation of the copy of the data center logical volume. The first condition includes that the number of copies created in the data center is greater than zero within a first preset time, or the number of copies in the data center exceeds a first threshold, at this time, the creation of copies needs to be suspended, that is, the creation of copies in the data center is not continued. In this embodiment, the first preset time is 24 hours, and the first threshold is 4, that is, if it is determined that there is one copy created in the data center within 24 hours or the number of copies of the data center reaches 4, the creation of copies in the data center is stopped, and the process continues to return to step S100.
The copy mechanism of the SeaweedFS of the present invention helps utilize computing and storage resources by deleting copies of unwanted volumes and creating additional copies of hot volumes. Two types of copies are defined: a primary replica and a secondary replica. The main copy is a copy created by the strategy of the original seaweedfs system, is protected and cannot be automatically deleted. The secondary copy is a copy created according to the method proposed by the present invention, and can be deleted at any time when the storage space of a certain site is insufficient. Automatic deletion will ensure that space can be freed up again once a site becomes full.
The reason for retaining the SeaweedFS master copy mechanism is to retain the interface set by the user so that the impact on the file system level is minimal. The secondary copy is created to make up the deficiency of the original copy strategy, and the dynamic and flexible configuration characteristics of copy storage according to the space, bandwidth and queuing conditions can be realized.
Step S300: judging whether the data information of the data center meets a second condition, if so, executing a step S400; if not, returning to the step S100;
in specific implementation, after the data information of the data center meets the first condition, the popularity of the Volume data of the logical Volume in a certain past period of time needs to be judged, and if the popularity is not popular enough, the copy is not created any more. Specifically, the second condition is that whether the retrieval access number (i.e., the data popularity) of the file of the logical Volume of the data center within a second preset time reaches a second threshold value or not, if so, it is determined that the data of the logical Volume reaches a welcome standard within the second preset time, and if not, it is determined that the data of the logical Volume does not reach the welcome standard within the second preset time, and the copy is not created any more. The system creates daily data access summary for each volume, and therefore the situation that speed is low when direct query is conducted is avoided after the summary. In this embodiment, the second preset time is 7 days, and the second threshold is 8.
Step S400: determining the sequencing of the data centers according to the data information of the data centers, and determining a target data center according to the sequencing;
in a specific implementation, a plurality of data centers are weighted and sorted according to the available space, the bandwidth and the queuing file, that is, the sorting of the data centers is determined according to the data information of the data centers, and then a target data center is determined according to the sorting, for example, if a copy is created in a certain data center recently, the sorting of the data center is reduced. Namely, the algorithm focuses on the conditions of the accessed heat, the free space and the network index of volume data in the data center, and weights the sites according to the standards to finally determine a proper data center for efficient copy creation.
The sorting needs to be described, the sorting of the data center is specifically realized through an Elasticsearch system, the sorting result is firstly sorted according to a first condition, and is sorted according to a second condition only when the first sort value of the result set is completely the same, and so on. When sorting is carried out, firstly, sorting is carried out according to the volume access heat degree, the heat degree is high in priority, secondly, sorting is carried out according to the idle space, the idle space is high in priority, and finally, sorting is carried out according to the network indexes, and the delay is low in priority.
Step S500: creating a copy of the target data center;
in specific implementation, after the target data center is determined, the target data center is provided to the seaweefs file system for use, and finally, a copy is created of the data of the logical Volume of the target data center according to the policy.
The data copy storage method further comprises an automatic copy deleting mechanism, and calculation and storage resources are utilized by deleting the copies of the unpopular volumes and creating additional copies of the hot volumes, so that the storage efficiency of the system is improved.
Namely, the data copy storage method further comprises the following steps:
judging whether the retrieval access number (namely the popularity of the data) of the copies of the data center in second preset time reaches a second threshold value, if so, not processing; and if not, deleting the copy of the data center.
It should be noted that, if the existence time of the copy does not reach the second preset time, the copy may be retained. And when the free storage space of the data center is short, deleting the data center.
Referring to fig. 4, fig. 4 is a schematic structural diagram of an embodiment of a distributed storage data copy storage system according to the present invention. The data copy storage system of the present invention comprises:
the collecting module 100 is configured to obtain data information of a plurality of data centers in a seaweedfs system;
a first determining module 200, configured to determine whether data information of the data center meets a first condition;
a second judging module 300, configured to judge whether the data information of the data center meets a second condition;
a determining module 400, configured to determine, according to the data information of the data center, a ranking of the data center, and determine a target data center according to the ranking.
And the execution module 500 is configured to create a copy for the target data center.
The data replica storage system further comprises:
a third determining module 600, configured to determine whether the number of retrieval accesses of the copy of the data center within a second preset time reaches a second threshold;
the deleting module 700 is configured to delete the copy of the data center when the number of retrieval accesses of the copy of the data center in a second preset time does not reach a second threshold.
The specific implementation of the data copy storage system of the present invention is basically the same as that of the above embodiments of the data copy storage method, and is not described herein again.
In addition, the present invention also provides a data copy storage device for distributed storage, where the data copy storage device includes a memory, a processor, and a data copy storage program that is stored in the memory and can be executed on the processor, where: when executed by the processor, the data copy storage program implements the data copy storage method according to the embodiments of the present invention.
In addition, the invention also provides a computer readable storage medium, on which the data copy storage program is stored. The computer-readable storage medium may be a Memory in the terminal in fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several instructions for causing a data copy storage device having a processor to execute the data copy storage method according to the embodiments of the present invention.
Compared with the prior art, the data copy storage method, the data copy storage system, the data copy storage equipment and the storage medium for distributed storage can realize reasonable placement and dynamic deletion of the data copy, expand a data copy mechanism and improve the storage efficiency of a file system.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.
Claims (9)
1. A method of storing data copies of distributed storage, the method comprising the steps of:
acquiring data information of a plurality of data centers in a seaweedfs system;
judging whether the data information of the data center meets a first condition, wherein the first condition comprises that the copy creation number of the data center is larger than zero in first preset time, or the copy number of the data center exceeds a first threshold value;
if so, judging whether the data information of the data center meets a second condition, wherein the second condition is whether the retrieval access quantity of the files of the data center logical volume in second preset time reaches a second threshold value;
if yes, determining the sorting of the data centers according to the data information of the data centers, and determining a target data center according to the sorting;
and creating a copy of the target data center.
2. The method for storing the data copy according to claim 1, wherein the first preset time is 24 hours, and the first threshold value is 4.
3. The method for storing a data copy according to claim 2, wherein the second predetermined time is 7 days, and the second threshold is 8.
4. The data replica storage method according to claim 3, wherein the step of determining the rank of the data center according to the data information of the data center specifically includes:
and carrying out weighted sequencing on the plurality of data centers according to the available space, the bandwidth and the queuing file of the data centers.
5. The data replica storage method according to claim 1, wherein the data replica storage method further comprises:
judging whether the retrieval access number of the copies of the data center in second preset time reaches a second threshold value, if so, not processing; and if not, deleting the copy of the data center.
6. A data replica storage system, the system comprising:
the collection module is used for acquiring data information of a plurality of data centers in the seaweedfs system;
the first judgment module is used for judging whether the data information of the data center meets a first condition or not;
the second judgment module is used for judging whether the data information of the data center meets a second condition or not;
the determining module is used for determining the sequencing of the data centers according to the data information of the data centers and determining a target data center according to the sequencing;
and the execution module is used for creating a copy for the target data center.
7. The data replica storage system of claim 6, the system further comprising:
the third judging module is used for judging whether the retrieval access number of the copies of the data center in second preset time reaches a second threshold value;
and the deleting module is used for deleting the copy of the data center under the condition that the retrieval access quantity of the copy of the data center in second preset time does not reach a second threshold value.
8. A data replica storage device, characterized in that the device comprises: memory, a processor and a data copy storage program stored on the memory and executable on the processor, the data copy storage program being configured to implement the steps of the data copy storage method of any of claims 1 to 5.
9. A storage medium, characterized in that the storage medium has stored thereon a data copy storage program which, when executed by a processor, implements the steps of the data copy storage method according to any one of claims 1 to 5.
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| CN103631894A (en) * | 2013-11-19 | 2014-03-12 | 浪潮电子信息产业股份有限公司 | Dynamic copy management method based on HDFS |
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