CN111143293A - Metadata acquisition method, device, equipment and computer readable storage medium - Google Patents
Metadata acquisition method, device, equipment and computer readable storage medium Download PDFInfo
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Abstract
The invention discloses a metadata acquisition method, a device, equipment and a computer readable storage medium; in the scheme, because the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory, the metadata is stored in a classified manner, so that the client can only obtain the metadata of the files under the directory or the metadata of the subdirectories when obtaining the metadata, the processing time of metadata obtaining requests is reduced, the disk load condition is reduced, and the metadata obtaining efficiency is improved.
Description
Technical Field
The present invention relates to the field of information storage technologies, and in particular, to a method, an apparatus, a device, and a computer-readable storage medium for metadata acquisition.
Background
At present, when a client needs to operate a certain directory, if metadata information of a Cdir (directory shard) corresponding to a metadata service check directory is not in a cache, the information of the Cdir and a directory entry need to be captured from a rados (reusable, automated Distributed ObjectStore). However, since metadata information of all sub-directories and files under a directory is stored in the same ompa (object map, data structure for storing metadata information), when the directory information is not in the cache, no matter the metadata information of the sub-directories under the directory is obtained, or the metadata information of the files under the directory is obtained, the whole ompa data structure of the directory needs to be fetched from the rados, that is, the ompa data structure to be fetched contains the metadata information of all the sub-directories and files under the directory, it can be seen that this obtaining manner intangibly fetches some unnecessary metadata information, and when there are a large number of fetching operations, a large read-write load is brought to an osd (object storage Device), which results in low fetching efficiency and timeout of client request processing time.
Disclosure of Invention
The invention aims to provide a metadata acquisition method, a metadata acquisition device, metadata acquisition equipment and a computer-readable storage medium, so that the metadata acquisition efficiency is improved.
In order to achieve the above object, the present invention provides a metadata acquisition method, including:
receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
determining a target omap corresponding to the metadata acquisition request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
and acquiring metadata information from the target omap and sending the metadata information to the client.
Before receiving a metadata obtaining request sent by a client, the method further includes:
receiving a request to store a target directory;
and storing the metadata of the file under the target directory and the metadata of the subdirectory under the target directory into different omaps of the disk.
Wherein, the storing the metadata of the file under the target directory and the metadata of the subdirectory under the target directory into different omaps of the disk comprises:
sequentially traversing each target content under the target directory, and determining an index node of each target content according to a directory entry of each target content;
determining the type of each target content by using the index node of each target content, wherein the type comprises files and subdirectories;
and storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk.
The step of storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk comprises the following steps:
caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures;
and respectively storing the metadata in different data structures into different omaps of the disk.
To achieve the above object, the present invention further provides a metadata acquisition apparatus, comprising:
the first receiving module is used for receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
a determining module, configured to determine a target omap corresponding to the metadata obtaining request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
and the sending module is used for obtaining metadata information from the target omap and sending the metadata information to the client.
Wherein, this scheme still includes:
a second receiving module, configured to receive a request for storing a target directory;
and the storage module is used for storing the metadata of the files under the target directory and the metadata of the subdirectories under the target directory into different omaps of the disk.
Wherein the storage module comprises:
the first determining unit is used for sequentially traversing each target content under the target directory and determining an index node of each target content according to a directory entry of each target content;
a second determining unit, configured to determine a type of each target content using the inode of each target content, where the type includes a file and a subdirectory;
and the storage unit is used for storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk.
Wherein the storage unit is specifically configured to: caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures; and respectively storing the metadata in different data structures into different omaps of the disk.
To achieve the above object, the present invention further provides a metadata acquisition apparatus including:
a memory for storing a computer program;
a processor for implementing the steps of the above-mentioned metadata acquisition method when executing the computer program.
To achieve the above object, the present invention further provides a computer-readable storage medium having a computer program stored thereon, where the computer program is executed by a processor to implement the steps of the above-mentioned metadata acquisition method.
According to the above scheme, the metadata acquisition method provided by the embodiment of the invention comprises the following steps: receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory; determining a target omap corresponding to the metadata acquisition request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory; and acquiring metadata information from the target omap and sending the metadata information to the client.
Therefore, the omap in the application only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory, and the metadata is stored in a classified manner, so that the client can only obtain the metadata of the files or the metadata of the subdirectories when obtaining the metadata, thereby reducing the processing time of metadata obtaining requests, reducing the disk load condition and improving the metadata obtaining efficiency; the invention also discloses a metadata acquisition device, equipment and a computer readable storage medium, which can also realize the technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a metadata obtaining method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a metadata obtaining apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a metadata obtaining device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a metadata acquisition method, a device, equipment and a computer readable storage medium, which are used for improving the metadata acquisition efficiency.
Referring to fig. 1, a metadata obtaining method provided in an embodiment of the present invention includes:
s101, receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
it should be noted that the metadata obtaining method described in this embodiment is applied to a case where metadata is not in a cache, and if the metadata is already stored in the cache, the corresponding metadata can be directly searched from the cache and returned after receiving a metadata obtaining request sent by a client, and it is not necessary to search for the corresponding metadata from a disk and return the metadata. Under the condition that the metadata is not in the cache, the metadata information of all the subdirectories and files under the directory needs to be acquired from the disk no matter the metadata information of the subdirectories under the directory or the metadata information of the files under the directory is acquired, and by the acquisition mode, some unnecessary metadata information is captured invisibly, when a large amount of capture operation exists, a large read-write load is brought to the disk, so that the capture efficiency is low, and the request processing time of the client is overtime.
In this application, before receiving the metadata obtaining request sent by the client, the method further includes: receiving a request to store a target directory; and storing the metadata of the file under the target directory and the metadata of the subdirectory under the target directory into different omaps of the disk.
That is, in the present application, when the client stores the directory, the metadata of the client needs to be stored in different omaps of the disk according to different types of the file and the subdirectory, so as to implement the classified storage of the metadata. Therefore, when acquiring metadata, the client in the present application may send only an acquisition request for acquiring a file under a directory, may send only an acquisition request for acquiring a subdirectory under a directory, and may also send an acquisition request for acquiring a file and a subdirectory under a directory, which is not limited in this respect.
S102, determining a target omap corresponding to the metadata acquisition request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
s103, obtaining metadata information from the target omap and sending the metadata information to the client.
It should be noted that, after receiving a metadata obtaining request sent by a client, a target omap for storing metadata can be determined according to a metadata type obtained by the request; namely: if the metadata acquisition request is an acquisition request for acquiring a file under a directory, the omap storing the metadata of the file under the directory is required to be used as a target omap; if the metadata acquisition request is an acquisition request for acquiring a subdirectory under the directory, the omap storing the metadata of the subdirectory under the directory is required to be used as a target omap; of course, if the metadata obtaining request is a request for obtaining a file and a sub-directory under the directory, it is necessary to search for an omap storing metadata of the file under the directory and an omap storing metadata of the sub-directory under the directory, respectively, and both the omaps are taken as target omaps. After the target omap storing the corresponding metadata is determined, the corresponding metadata can be directly obtained from the target omap and sent to the client, thereby realizing the obtaining of the metadata,
it can be seen that the present solution classifies and stores the metadata according to the difference between the file and the directory in the content under the directory. Therefore, when the client side obtains the metadata, the client side can directly obtain the corresponding metadata no matter the client side obtains the metadata of the file under the directory or obtains the metadata of the sub-directories under the directory, and the whole metadata of the directory does not need to be obtained, so that the metadata obtaining time is reduced, the processing time of metadata obtaining requests is reduced, the disk load condition is reduced, and the metadata obtaining efficiency is improved.
Based on the foregoing embodiment, in this embodiment, storing metadata of a file under the target directory and metadata of a sub-directory under the target directory in different omaps of a disk includes:
sequentially traversing each target content under the target directory, and determining an index node of each target content according to a directory entry of each target content;
determining the type of each target content by using the index node of each target content, wherein the type comprises files and subdirectories;
caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures;
and respectively storing the metadata in different data structures into different omaps of the disk.
It should be noted that, in this application, when a directory is submitted to a disk, the contents under the directory need to be traversed, and in this scheme, for convenience of description, the contents that are performing operations are referred to as target contents, and the target contents may be files or sub-directories. The files or the subdirectories under the directory all have corresponding directory entries, the directory entries are of a structure containing file names and index node numbers, so that index nodes of the target content can be determined through the directory entries of the target content, and because the index nodes store related information such as attributes and the like, the type of the target content can be directly judged to be the files or the subdirectories according to the index nodes of the target content, and the metadata of the target content of which the type is the files and the metadata of the target content of which the type is the subdirectories are cached in different omaps of the disk.
It should be noted that, since the metadata needs to be classified and then stored, in order to avoid the problem that the metadata is written into the disk for a long time due to a too slow metadata classification process, the metadata information corresponding to the file and the subdirectory can be stored in different data structures, so as to realize pre-classification and temporary storage of the metadata, after the metadata is classified, different OSD operation data structures can be created, the metadata information temporarily stored in the data structures is filled into the OSD operation data structures, and the storage operation of the metadata is executed, so that the metadata information of the file and the subdirectory is stored in different omaps of rados. Therefore, when the content in the directory is captured, only the metadata information of the file or the directory can be captured according to the requirement of the client.
In summary, the metadata information classified storage method provided by the application can reduce the processing time of the metadata request and the read-write load of the osd in the service use scene, and improve the efficiency; in addition, in the manner provided by this embodiment, the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory are cached in different data structures, and then the cached metadata in the different data structures are stored in different omaps of the disk, so that the disk writing time can be reduced, and the metadata writing efficiency can be improved.
In the following, the acquisition apparatus provided by the embodiment of the present invention is introduced, and the acquisition apparatus described below and the acquisition method described above may be referred to each other.
Referring to fig. 2, a schematic structural diagram of a metadata obtaining apparatus according to an embodiment of the present invention is shown; the device includes:
a first receiving module 100, configured to receive a metadata obtaining request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
a determining module 200, configured to determine a target omap corresponding to the metadata obtaining request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
a sending module 300, configured to obtain metadata information from the target omap, and send the metadata information to the client.
Wherein, this scheme still includes:
a second receiving module, configured to receive a request for storing a target directory;
and the storage module is used for storing the metadata of the files under the target directory and the metadata of the subdirectories under the target directory into different omaps of the disk.
Wherein the storage module comprises:
the first determining unit is used for sequentially traversing each target content under the target directory and determining an index node of each target content according to a directory entry of each target content;
a second determining unit, configured to determine a type of each target content using the inode of each target content, where the type includes a file and a subdirectory;
and the storage unit is used for storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk.
Wherein the storage unit is specifically configured to: caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures; and respectively storing the metadata in different data structures into different omaps of the disk.
Referring to fig. 3, the embodiment of the present invention further discloses a structural diagram of a metadata obtaining device; the apparatus comprises:
a memory 11 for storing a computer program;
a processor 12 for implementing the steps of the metadata acquisition method according to the above method embodiment when executing the computer program.
In this embodiment, the device may be a PC (Personal Computer), or may be a terminal device such as a smart phone, a tablet Computer, a palmtop Computer, or a portable Computer.
The device may include a memory 11, a processor 12, and a bus 13.
The memory 11 includes at least one type of readable storage medium, which includes a flash memory, a hard disk, a multimedia card, a card type memory (e.g., SD or DX memory, etc.), a magnetic memory, a magnetic disk, an optical disk, and the like. The memory 11 may in some embodiments be an internal storage unit of the device, for example a hard disk of the device. The memory 11 may also be an external storage device of the device in other embodiments, such as a plug-in hard disk provided on the device, a Smart Memory Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 11 may also include both an internal storage unit of the device and an external storage device. The memory 11 may be used not only to store application software installed in the device and various types of data such as program codes for performing a metadata acquisition method, etc., but also to temporarily store data that has been output or is to be output.
The processor 12 may be, in some embodiments, a Central Processing Unit (CPU), controller, microcontroller, microprocessor or other data Processing chip, and is used for executing program codes stored in the memory 11 or Processing data, such as program codes for executing a metadata obtaining method.
The bus 13 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.
Further, the device may further include a network interface 14, and the network interface 14 may optionally include a wired interface and/or a wireless interface (e.g., WI-FI interface, bluetooth interface, etc.), which are generally used to establish a communication connection between the device and other electronic devices.
Optionally, the device may further comprise a user interface, which may comprise a Display (Display), an input unit such as a Keyboard (Keyboard), and optionally a standard wired interface, a wireless interface. Alternatively, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, or the like. The display, which may also be referred to as a display screen or display unit, is suitable for displaying information processed in the device and for displaying a visualized user interface.
Fig. 3 shows only the device with the components 11-14, and it will be understood by those skilled in the art that the structure shown in fig. 3 does not constitute a limitation of the device, and may comprise fewer or more components than those shown, or some components may be combined, or a different arrangement of components.
The embodiment of the invention also discloses a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when being executed by a processor, the computer program realizes the steps of the metadata acquisition method according to the embodiment of the method.
Wherein the storage medium may include: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A metadata acquisition method, comprising:
receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
determining a target omap corresponding to the metadata acquisition request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
and acquiring metadata information from the target omap and sending the metadata information to the client.
2. The metadata obtaining method according to claim 1, wherein before receiving the metadata obtaining request sent by the client, the method further comprises:
receiving a request to store a target directory;
and storing the metadata of the file under the target directory and the metadata of the subdirectory under the target directory into different omaps of the disk.
3. The method according to claim 2, wherein the storing the metadata of the file in the target directory and the metadata of the subdirectory in the target directory to different omaps of a disk comprises:
sequentially traversing each target content under the target directory, and determining an index node of each target content according to a directory entry of each target content;
determining the type of each target content by using the index node of each target content, wherein the type comprises files and subdirectories;
and storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk.
4. The method according to claim 3, wherein the storing the metadata of the target content with the type of file and the metadata of the target content with the type of subdirectory into different omaps of the disk comprises:
caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures;
and respectively storing the metadata in different data structures into different omaps of the disk.
5. A metadata acquisition apparatus, comprising:
the first receiving module is used for receiving a metadata acquisition request sent by a client; the metadata acquisition request is an acquisition request for acquiring files under a directory or an acquisition request for acquiring sub-directories under the directory;
a determining module, configured to determine a target omap corresponding to the metadata obtaining request in a disk; wherein, the omap only stores the metadata of the files under the directory or the metadata of the subdirectories under the directory;
and the sending module is used for obtaining metadata information from the target omap and sending the metadata information to the client.
6. The metadata acquisition apparatus according to claim 5, further comprising:
a second receiving module, configured to receive a request for storing a target directory;
and the storage module is used for storing the metadata of the files under the target directory and the metadata of the subdirectories under the target directory into different omaps of the disk.
7. The metadata acquisition apparatus according to claim 6, wherein the storage module comprises:
the first determining unit is used for sequentially traversing each target content under the target directory and determining an index node of each target content according to a directory entry of each target content;
a second determining unit, configured to determine a type of each target content using the inode of each target content, where the type includes a file and a subdirectory;
and the storage unit is used for storing the metadata of the target content with the type of the file and the metadata of the target content with the type of the subdirectory into different omaps of the disk.
8. The metadata acquisition apparatus according to claim 7,
the storage unit is specifically configured to: caching metadata of target content with the type of a file and metadata of target content with the type of a subdirectory into different data structures; and respectively storing the metadata in different data structures into different omaps of the disk.
9. A metadata acquisition apparatus characterized by comprising:
a memory for storing a computer program;
a processor for implementing the steps of the metadata acquisition method as claimed in any one of claims 1 to 4 when executing said computer program.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the metadata acquisition method according to any one of claims 1 to 4.
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