CN113608687A - Space recovery method, device and equipment and readable storage medium - Google Patents
Space recovery method, device and equipment and readable storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000011084 recovery Methods 0.000 title abstract description 13
- 238000004064 recycling Methods 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000007717 exclusion Effects 0.000 description 3
- 238000004883 computer application Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
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- 230000002085 persistent effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0674—Disk device
- G06F3/0676—Magnetic disk device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0629—Configuration or reconfiguration of storage systems
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Abstract
The invention discloses a space recovery method, which provides a solution to the problems of space leakage and recovery of a metadata bitmap of a storage system in a storage process. The invention also discloses a space recovery device, equipment and a readable storage medium, and has corresponding technical effects.
Description
Technical Field
The present invention relates to the field of storage technologies, and in particular, to a space recycling method, apparatus, device, and readable storage medium.
Background
Currently, metadata is introduced in the process of managing data in many full flash memory storage systems, and various high-level characteristics such as deduplication, garbage collection and the like can be realized based on the metadata, so that the management of the metadata is very important for the overall operation of the storage system.
The space allocation of the metadata needs to be managed by a bitmap, and the space occupation state of the metadata is recorded by the bitmap. Some metadata space bitmaps are pre-allocated in a memory, and are lost when a system failure or a device failure occurs, the bitmap loss caused by a single failure or limited multiple failures may not cause system crash, but the system may not be available due to the loss of the metadata bitmaps after a threshold value is exceeded, and currently, there is no effective processing mode for the situation.
In summary, how to achieve effective management of metadata bitmaps and ensure system stability is a technical problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a space recovery method, a space recovery device, a space recovery equipment and a readable storage medium, which can realize effective management of a metadata bitmap and guarantee the stability of a system.
In order to solve the technical problems, the invention provides the following technical scheme:
a method of space reclamation, comprising:
determining a target bitmap;
scanning metadata corresponding to the target bitmap in a disk, and determining the occupation state of the metadata;
if the metadata is occupied, setting the target bitmap as 1;
and if the metadata is not occupied, setting the target bitmap to be 0.
Optionally, the determining the target bitmap includes:
and after the system is restarted, acquiring a pre-allocated bitmap as the target bitmap.
Optionally, before the determining the target bitmap, the method further includes:
judging whether a host IO data writing process exists at present;
and if not, executing the step of determining the target bitmap.
Optionally, the scanning, in the disk, the metadata corresponding to the target bitmap, and determining an occupation state of the metadata include:
searching a metadata space corresponding to the target bitmap in a disk to serve as a target space;
inquiring whether the target space falls on a B + tree or not;
if yes, judging that the metadata is occupied;
if not, determining that the metadata is not occupied.
Optionally, after setting the target bitmap to 0, the method further includes:
and releasing the storage space corresponding to the metadata and the bitmap.
A space reclamation apparatus, comprising:
a bitmap determination unit for determining a target bitmap;
the disk scanning unit is used for scanning metadata corresponding to the target bitmap in a disk and determining the occupation state of the metadata; if the metadata is occupied, triggering a first setting unit; if the metadata is not occupied, triggering a second setting unit;
the first setting unit is used for setting the target bitmap to be 1;
the second setting unit is configured to set the target bitmap to 0.
Optionally, the bitmap determining unit is specifically a restart triggering unit, and the restart triggering unit is configured to:
and after the system is restarted, acquiring a pre-allocated bitmap as the target bitmap.
Optionally, the space reclamation apparatus further includes a priority determining unit, configured to determine whether there is a host IO data write process currently before the bitmap determining unit determines the target bitmap; and if the bitmap does not exist, triggering the bitmap determining unit.
A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the space reclamation method when executing the computer program.
A readable storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the above-mentioned space reclamation method.
The method provided by the embodiment of the invention provides a solution to the problems of space leakage and recovery of the metadata bitmap of the storage system in the storage process, and the method comprises the steps of scanning the space occupation state of the metadata corresponding to the target bitmap, determining whether the metadata is occupied or not through scanning, resetting the target bitmap according to the scanning result, realizing the change of the bitmap from the unknown state to the known state, recycling and utilizing the corresponding space of the system based on the known occupation state, realizing the repeated utilization of the space and improving the stability of the storage system.
Accordingly, embodiments of the present invention further provide a space recycling device, a device, and a readable storage medium corresponding to the space recycling method, which have the above technical effects and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts 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 flow chart of an embodiment of a space reclamation method;
FIG. 2 is a schematic structural diagram of a space recycling apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a space recovery method, which can realize the effective management of the metadata bitmap and ensure the stability of the system.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Referring to fig. 1, fig. 1 is a flowchart illustrating a space recycling method according to an embodiment of the present invention, the method including the following steps:
s101, determining a target bitmap;
the target bitmaps refer to bitmaps to be subjected to space recycling, and the metadata stored in the general target bitmaps are unknown in state, so that the bitmaps cannot be recycled or utilized.
In this embodiment, the determination method of the target bitmap is not limited, and the target bitmap may be specified by a user, may also be automatically obtained according to a set rule, and may be set according to the need of actual space reclamation.
Since the current allocation strategy of the metadata space bitmap is that all currently allocated bitmaps return to be confirmed to be occupied and then are released, there is a possibility that leakage is definitely a bitmap Block (Block) currently in the bitmap allocation, and therefore, optionally, the process of determining the target bitmap may be: and taking the bitmap Block currently being allocated as a target bitmap.
In addition, since the bitmap is generally lost after the system is restarted, and the lost bitmap is generally a pre-allocated bitmap stored in the memory (i.e., a certain memory space used as a bitmap is pre-defined during initialization of the storage system), the process of determining the target bitmap may be: and after the system is restarted, acquiring a pre-allocated bitmap as a target bitmap.
In this embodiment, only the two implementation manners are described as an example, and other determination manners can refer to the description of this embodiment and are not described herein again.
S102, scanning metadata corresponding to a target bitmap in a disk, and determining the occupation state of the metadata;
because the target bitmap cannot be recycled due to state loss, in this embodiment, metadata corresponding to the target bitmap is scanned in a space occupation state, whether the metadata is occupied is determined through scanning, and the target bitmap is reset according to a scanning result, so that subsequent bitmaps in different states can be recycled and utilized conveniently.
The metadata corresponding to the target bitmap is stored in the disk, and therefore, the metadata needs to be scanned in the disk to determine the state of the metadata, and a specific implementation manner of determining the occupation state is not limited in this embodiment, for example, whether the metadata falls on the B + tree or not may be determined, or the occupation record of the historical metadata may be searched.
In order to ensure accurate determination of the occupancy state information, optionally, the metadata corresponding to the target bitmap is scanned in the disk, and the process of determining the occupancy state of the metadata may specifically include the following steps:
(1) searching a metadata space corresponding to a target bitmap in a disk as a target space;
(2) inquiring whether the target space falls on a B + tree or not;
(3) if yes, judging that the metadata is occupied;
(4) if not, the metadata is judged to be unoccupied.
According to the method, the current Block is traversed to query the metadata, the occupied state of the metadata is determined by determining whether the currently occupied bitmap really completes the disk-dropping to the B + tree, the query is performed from the real state of the bottom data, the actual state corresponding to each metadata can be accurately determined, and the query accuracy is high.
In addition, occupation and release of the metadata bitmap are involved in the process of disk dropping, and furthermore, a thread lock-free and process mutual exclusion mode can be adopted in the query process, unnecessary cost caused by the mutual exclusion can be reduced based on the thread lock-free, and the accuracy of bitmap query can be further improved due to the process mutual exclusion.
S103, if the metadata is occupied, setting a target bitmap as 1;
if the metadata is occupied through the disk status query, step S103 is executed to set the corresponding target bitmap to 1 to indicate that it is occupied. Since some target bitmaps are set to 1 when the state is unknown to avoid repeated occupation, the target bitmap may not be reset if the default is set to 1 in this case.
And S104, if the metadata is not occupied, setting the target bitmap to be 0.
If the metadata is determined to be unoccupied through the disk status query, step S104 is executed to set the target bitmap to 0 to indicate that it is unoccupied.
And after the target bitmap is reset, the occupation state of the target bitmap becomes known, and corresponding space recycling processing can be performed based on the known occupation state, so that the space is recycled.
Further, after the target bitmap is set to 0, in order to accelerate the space reclamation processing flow, the metadata and the storage space corresponding to the bitmap can be immediately released, and the metadata and the storage space are put into the resource pool again for repeated calling. Of course, the above steps may not be performed, and are not limited herein.
Based on the introduction, the technical scheme provided by the embodiment of the invention provides a solution to the problems of space leakage and recovery of a metadata bitmap of a storage system in a storage process, the method comprises the steps of scanning the metadata corresponding to a target bitmap in a space occupation state, determining whether the metadata is occupied or not through scanning, resetting the target bitmap according to a scanning result, and realizing the change of the bitmap from an unknown state to a known state.
It should be noted that, based on the above embodiments, the embodiments of the present invention also provide corresponding improvements. In the preferred/improved embodiment, the same steps as those in the above embodiment or corresponding steps may be referred to each other, and corresponding advantageous effects may also be referred to each other, which are not described in detail in the preferred/improved embodiment herein.
On the basis of the above embodiment, before step S101, the following steps may be further performed: s100, judging whether a host IO data writing process exists at present; if not, go to step S101. If yes, the step S100 may be executed again after waiting for a preset duration, or the step S100 may be directly skipped to for repeated determination, which is not limited in this embodiment.
In this embodiment, bitmap space recovery is set as a low-priority task, a priority judgment logic is designed in the recovery process, and when a request for a disk drop is found (i.e., a host IO data write process exists) after one query, the request for the disk drop is preferentially processed, so that IO efficiency of the storage system can be ensured.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a space recycling apparatus, and the space recycling apparatus described below and the space recycling method described above may be referred to in correspondence with each other.
Referring to fig. 2, the apparatus includes the following modules:
the bitmap determination unit 110 is mainly used for determining a target bitmap;
the disk scanning unit 120 is mainly configured to scan metadata corresponding to a target bitmap in a disk, and determine an occupation state of the metadata; if the metadata is occupied, triggering a first setting unit 130; if the metadata is not occupied, triggering the second setting unit 140;
the first setting unit 130 is mainly used for setting the target bitmap to 1;
the second setting unit 140 is mainly used to set the target bitmap to 0.
In a specific embodiment of the present invention, the bitmap determining unit is specifically a restart triggering unit, and the restart triggering unit is configured to:
and after the system is restarted, acquiring a pre-allocated bitmap as a target bitmap.
In a specific embodiment of the present invention, the space reclamation apparatus further includes a priority determination unit, configured to determine whether there is a host IO data write process currently before the bitmap determination unit determines the target bitmap; and if not, triggering a bitmap determination unit.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a computer device, and a computer device described below and a space recycling method described above may be referred to correspondingly.
The computer device includes:
a memory for storing a computer program;
a processor for implementing the steps of the space reclamation method of the above-described method embodiments when executing a computer program.
Specifically, referring to fig. 3, a specific structural diagram of a computer device provided in this embodiment is a schematic diagram of a computer device, which may generate relatively large differences due to different configurations or performances, and may include one or more processors (CPUs) 322 (e.g., one or more processors) and a memory 332, where the memory 332 stores one or more computer applications 342 or data 344. Memory 332 may be, among other things, transient or persistent storage. The program stored in memory 332 may include one or more modules (not shown), each of which may include a sequence of instructions operating on a data processing device. Still further, the central processor 322 may be configured to communicate with the memory 332 to execute a series of instruction operations in the memory 332 on the computer device 301.
The computer device 301 may also include one or more power supplies 326, one or more wired or wireless network interfaces 350, one or more input-output interfaces 358, and/or one or more operating systems 341.
The steps in the space reclamation method described above may be implemented by the structure of a computer device.
Corresponding to the above method embodiment, the embodiment of the present invention further provides a readable storage medium, and a readable storage medium described below and a space recycling method described above may be referred to correspondingly.
A readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the space reclamation method of the above-mentioned method embodiment.
The readable storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various other readable storage media capable of storing program codes.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Claims (10)
1. A method of space reclamation, comprising:
determining a target bitmap;
scanning metadata corresponding to the target bitmap in a disk, and determining the occupation state of the metadata;
if the metadata is occupied, setting the target bitmap as 1;
and if the metadata is not occupied, setting the target bitmap to be 0.
2. The space reclamation method of claim 1, wherein determining the target bitmap comprises:
and after the system is restarted, acquiring a pre-allocated bitmap as the target bitmap.
3. The space reclamation method of claim 1, further comprising, prior to the determining the target bitmap:
judging whether a host IO data writing process exists at present;
and if not, executing the step of determining the target bitmap.
4. The method for recycling space according to claim 1, wherein the scanning metadata corresponding to the target bitmap in the disk and determining the occupation status of the metadata comprises:
searching a metadata space corresponding to the target bitmap in a disk to serve as a target space;
inquiring whether the target space falls on a B + tree or not;
if yes, judging that the metadata is occupied;
if not, determining that the metadata is not occupied.
5. The space reclamation method of claim 1, further comprising, after said setting the target bitmap to 0:
and releasing the storage space corresponding to the metadata and the bitmap.
6. A space reclamation apparatus, comprising:
a bitmap determination unit for determining a target bitmap;
the disk scanning unit is used for scanning metadata corresponding to the target bitmap in a disk and determining the occupation state of the metadata; if the metadata is occupied, triggering a first setting unit; if the metadata is not occupied, triggering a second setting unit;
the first setting unit is used for setting the target bitmap to be 1;
the second setting unit is configured to set the target bitmap to 0.
7. The space reclamation apparatus as recited in claim 6, wherein the bitmap determination unit is specifically a restart trigger unit, and the restart trigger unit is configured to:
and after the system is restarted, acquiring a pre-allocated bitmap as the target bitmap.
8. The space reclamation apparatus according to claim 6, further comprising a priority determination unit configured to determine whether there is a host IO data write process currently before the bitmap determination unit performs determining the target bitmap; and if the bitmap does not exist, triggering the bitmap determining unit.
9. A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the space reclamation method as claimed in any one of claims 1 to 5 when executing said computer program.
10. A readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the space reclamation method as claimed in any one of claims 1 to 5.
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| CN202110744643.7A CN113608687A (en) | 2021-06-30 | 2021-06-30 | Space recovery method, device and equipment and readable storage medium |
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| CN202110744643.7A CN113608687A (en) | 2021-06-30 | 2021-06-30 | Space recovery method, device and equipment and readable storage medium |
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Application publication date: 20211105 |