CN114116639B - Method, device, equipment and medium for setting cluster file lock - Google Patents
Method, device, equipment and medium for setting cluster file lock Download PDFInfo
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- CN114116639B CN114116639B CN202210097224.3A CN202210097224A CN114116639B CN 114116639 B CN114116639 B CN 114116639B CN 202210097224 A CN202210097224 A CN 202210097224A CN 114116639 B CN114116639 B CN 114116639B
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- 230000002159 abnormal effect Effects 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 10
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- 230000009286 beneficial effect Effects 0.000 description 4
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- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/10—File systems; File servers
- G06F16/17—Details of further file system functions
- G06F16/176—Support for shared access to files; File sharing support
- G06F16/1767—Concurrency control, e.g. optimistic or pessimistic approaches
- G06F16/1774—Locking methods, e.g. locking methods for file systems allowing shared and concurrent access to files
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F9/00—Arrangements for program control, e.g. control units
- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
- G06F9/46—Multiprogramming arrangements
- G06F9/52—Program synchronisation; Mutual exclusion, e.g. by means of semaphores
- G06F9/526—Mutual exclusion algorithms
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Abstract
The application discloses a method, a device, equipment and a medium for setting a cluster file lock, wherein the method comprises the following steps: setting a target temporary file on a specified directory of a specified node of the NAS cluster by using a placemaker; when the application program of the target node needs to acquire the cluster file lock, judging whether the appointed directory of the target node has a target temporary file; if the local file lock exists, the application program contends for the local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended; and when the application program completes the specified task, releasing the local file lock to complete the release of the cluster file lock. Compared with the prior art, the method is dependent on the attribute characteristics of the placemaker to set the cluster file lock, so that the tedious step of introducing a cluster file system into the NAS cluster can be avoided, and the complexity in realizing the cluster file lock can be obviously reduced by the method.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a method, a device, equipment and a medium for setting a cluster file lock.
Background
In a NAS (Network Attached Storage) Cluster, a CTDB (Cluster triviral Database) is generally used to manage a file sharing protocol. When a node in the NAS cluster goes on and off, the CTDB executes recovery operation on all the nodes, namely, synchronizes the node state, files, sessions and other information of the current cluster. At this point the CTDB elects a recovery master node to perform the operation. In the prior art, a recovery master node of the CTDB is determined by acquiring a cluster file lock, and only one process of one node can acquire the cluster file lock at any time, so that the method can ensure the uniqueness and reliability of the recovery master node. Since the cluster file lock is implemented by the cluster file system, the cluster file system needs to be introduced in the cluster in order to support the CTDB, which increases the system complexity of the NAS cluster.
For some NAS clusters using a high-availability cluster resource manager, the placemaker itself has a function of managing resources, and a single-node running resource can only run on one node at the same time, which is the same as the application concept of a cluster file lock. Therefore, how to implement cluster file lock by using the pacemaker without depending on the cluster file system is particularly important for improving the overall reliability of the NAS cluster so as to reduce the system complexity of the NAS cluster.
Disclosure of Invention
In view of this, an object of the present invention is to provide a method, an apparatus, a device and a medium for setting a cluster file lock, so as to reduce system complexity when implementing the cluster file lock. The specific scheme is as follows:
a method for setting cluster file lock is applied to an NAS cluster provided with a placemaker; the method comprises the following steps:
setting a target temporary file on a specified directory of the specified node of the NAS cluster by utilizing the placemaker;
when an application program of a target node needs to acquire a cluster file lock, judging whether the designated directory of the target node has the target temporary file or not;
if yes, the application program contends for a local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended;
and when the application program finishes the specified task, releasing the local file lock to finish the release of the cluster file lock.
Preferably, the specified directory is specifically a/dev/shm directory.
Preferably, the method further comprises the following steps:
when the placemaker detects that the target node is abnormal, judging whether the placemaker can obtain the local file lock;
and if so, deleting the local file lock.
Preferably, after the step of determining whether the placemaker can obtain the local file lock, the method further includes:
if not, continuing to execute the step of judging whether the placemaker can obtain the local file lock or not after waiting for a preset time;
if yes, executing the step of deleting the local file lock;
and if not, forcing the target node to be offline.
Preferably, the method further comprises the following steps:
and when the placemaker detects that the target node is down, judging that the target node is abnormal.
Preferably, the method further comprises the following steps:
and when the placemaker detects that the time length of the local file lock occupied by the application program exceeds the preset time length, judging that the target node is abnormal.
Correspondingly, the embodiment of the invention also discloses a setting device of the cluster file lock, which is applied to the NAS cluster with the placemaker; the method comprises the following steps:
the file setting module is used for setting a target temporary file on a specified directory of the specified node of the NAS cluster by utilizing the placemaker;
the file judgment module is used for judging whether the designated directory of the target node has the target temporary file or not when the application program of the target node acquires the cluster file lock;
the file lock contending module is used for contending a local file lock of the target temporary file by the application program when the judgment result of the file judgment module is yes, and finishing the acquisition of the cluster file lock when the local file lock is contended;
and the file lock releasing module is used for releasing the local file lock when the application program completes the specified task so as to complete the release of the cluster file lock.
Correspondingly, the embodiment of the invention also discloses a device for setting the cluster file lock, which comprises:
a memory for storing a computer program;
a processor for implementing the steps of a method for setting a cluster file lock as disclosed in the foregoing when executing the computer program.
Correspondingly, the present invention also discloses a computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for setting a cluster file lock as disclosed in the foregoing.
Therefore, in the invention, a target temporary file is set on a designated node in an NAS cluster by using a placemaker in advance; when the application program of the target node needs to acquire the cluster file lock, judging whether the appointed directory of the target node has a target temporary file; if the local file lock exists, the application program contends for the local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended; and when the application program completes the specified task, releasing the local file lock to complete the release of the cluster file lock. Compared with the prior art, the method is dependent on the attribute characteristics of the placemaker to set the cluster file lock, so that the tedious step of introducing a cluster file system into the NAS cluster can be avoided, and the complexity in realizing the cluster file lock can be obviously reduced by the method. Correspondingly, the setting device, the equipment and the medium for the cluster file lock have the beneficial 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for setting a cluster file lock according to an embodiment of the present invention;
fig. 2 is a structural diagram of a setting apparatus for a cluster file lock according to an embodiment of the present invention;
fig. 3 is a structural diagram of a setting device for a cluster file lock 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.
Referring to fig. 1, fig. 1 is a flowchart of a method for setting a cluster file lock according to an embodiment of the present invention, where the method includes:
step S11: setting a target temporary file on a specified directory of a specified node of the NAS cluster by using a placemaker;
step S12: when the application program of the target node needs to acquire the cluster file lock, judging whether the appointed directory of the target node has a target temporary file;
step S13: if the local file lock exists, the application program contends for the local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended;
step S14: and when the application program completes the specified task, releasing the local file lock to complete the release of the cluster file lock.
In this embodiment, a method for setting a cluster file lock is provided, by which complexity in implementing the cluster file lock can be significantly reduced. The method is applied to the NAS cluster provided with the placemaker.
Specifically, in the method, a target temporary file is set on a specified directory of a specified node of the NAS cluster in advance by using a resource manager placemaker of the NAS cluster. The resource manager placemaker can set a target temporary file on any node in the NAS cluster. When the resource manager placemaker sets the target temporary file on the specified directory of the specified node, all processes of all nodes in the NAS cluster can contend for the local file lock of the target temporary file.
That is, when the application program of the target node needs to acquire the cluster file lock, it is first determined whether the target temporary file exists in the designated directory of the target node where the application program is located, and if the target temporary file does not exist in the designated directory of the target node, the application program of the target node cannot contend for the local file lock of the target temporary file. If the target temporary file exists in the designated directory of the target node, the application program of the target node can contend for the local file lock of the target temporary file, and when the application program of the target node contends for the local file lock of the target temporary file, the setting of the cluster file lock is finished from the NAS cluster level. It should be noted that the target node refers to any node in the NAS cluster, and the application program of the target node refers to any program process on the target node.
When the application program of the target node contends for the local file lock of the target temporary file and finishes the specified task, the application program of the target node releases the local file lock, namely releases the cluster file lock. At this point, the release process of the cluster file lock is completed from the NAS cluster level.
It can be understood that, since the resource manager placemaker itself has the capability of managing resources, and only a single node running resource is allowed to run on only one node at the same time, this is exactly the same as the application concept that a cluster file lock can only be held by one process of one node. Therefore, when the method provided by the application is used for setting the cluster file lock in the NAS cluster, the complex process of introducing the cluster file system into the NAS cluster can be avoided, and therefore the complexity of realizing the cluster file lock can be obviously reduced.
As can be seen, in this embodiment, a target temporary file is set on a designated node in the NAS cluster in advance by using a placemaker; when the application program of the target node needs to acquire the cluster file lock, judging whether the appointed directory of the target node has a target temporary file; if the local file lock exists, the application program contends for the local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended; and when the application program completes the specified task, releasing the local file lock to complete the release of the cluster file lock. Compared with the prior art, the method is dependent on the attribute characteristics of the placemaker to set the cluster file lock, so that the tedious step of introducing a cluster file system into the NAS cluster can be avoided, and the complexity in realizing the cluster file lock can be obviously reduced by the method.
Based on the above embodiments, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the specified directory is specifically a/dev/shm directory.
Specifically, when the resource manager placemaker sets the target temporary file on the specified directory of the specified node of the NAS cluster, the target temporary file may be set on the/dev/shm directory of the specified node. Because the/dev/shm directory is a directory virtualized by using a memory, all files in the/dev/shm directory are stored in the memory, not in a disk. Therefore, under the Linux system, the effect of optimizing can be achieved by directly using the/dev/shm directory without setting the ramdisk (virtual memory disk) in a complicated way.
Based on the foregoing embodiment, this embodiment further describes and optimizes the technical solution, and as a preferred implementation, the setting method further includes:
when the placemaker detects that the target node is abnormal, judging whether the placemaker can obtain a local file lock;
if yes, deleting the local file lock.
In the process of managing the NAS cluster by using the resource manager placemaker, if the resource manager placemaker detects that the target node is abnormal and needs to stop the cluster file lock, the stopping action of the cluster file lock is executed. In this case, if the cluster file lock is already held by the application of the target node, then directly deleting the cluster file lock will result in an action of the cluster file lock being started on other processes of other nodes, which may result in an abnormal situation where one cluster file lock is held by 2 nodes at the same time.
In this embodiment, in order to avoid the above situation, it is necessary to use the placemaker to try to acquire the local file lock of the target temporary file, and if the placemaker acquires the local file lock of the target temporary file, it indicates that the local file lock of the target temporary file is not held by the application program of the target node, and at this time, the local file lock of the target temporary file may be directly deleted.
As a preferred embodiment, the above steps: after judging whether the procedure of obtaining the local file lock can be obtained by the placemaker, the method further comprises the following steps:
if not, continuing to execute the step of judging whether the placemaker can obtain the local file lock or not after waiting for the preset time;
if yes, executing a step of deleting the local file lock;
and if not, forcing the target node to be offline.
In practical application, if the placemaker cannot acquire the local file lock of the target temporary file, it indicates that the local file lock of the target temporary file is already held by the application program of the target node. In this case, the placemaker waits for a preset time and then continues to execute the step of determining whether the placemaker can obtain the local file lock, so as to wait for the application program of the target node to release the local file lock of the target temporary file.
If the placemaker can obtain the local file lock of the target temporary file after waiting for the preset time, the placemaker can directly delete the local file lock of the target temporary file; if the placemaker can not acquire the local file lock of the target temporary file after waiting for the preset time, the placemaker can force the target node to go offline. In this case, the local file lock of the target temporary file is automatically cancelled, thereby avoiding the above abnormal situation. It should be noted that, in practical application, a user may perform user-defined setting on the preset time, which is not described in detail herein.
As a preferred embodiment, the setting method further includes:
and when the placemaker detects that the target node is down, judging that the target node is abnormal.
Specifically, if the placemaker detects that the target node is down, the application program of the target node cannot normally hold the local file lock of the target temporary file at this time, and the placemaker determines that the target node is abnormal at this time.
As a preferred embodiment, the setting method further includes:
and when the pacemaker detects that the time length of the local file lock occupied by the application program exceeds the preset time length, judging that the target node is abnormal.
Or, when the duration that the application program of the target node occupies the local file lock exceeds the preset duration, it indicates that the application program of the target node cannot normally release the local file lock, and at this time, the placemaker also determines that the target node is abnormal.
Obviously, the technical scheme provided by the embodiment can further ensure the overall reliability of the cluster file lock in the setting process.
Referring to fig. 2, fig. 2 is a structural diagram of a setting apparatus for a cluster file lock according to an embodiment of the present invention, where the apparatus includes:
the file setting module 21 is configured to set a target temporary file on a specified directory of a specified node of the NAS cluster by using a placemaker;
the file judging module 22 is configured to, when the application program of the target node needs to acquire the cluster file lock, judge whether the designated directory of the target node has a target temporary file;
the file lock contending module 23 is configured to, when the determination result of the file determination module is yes, contend, by the application, a local file lock of the target temporary file, and complete acquisition of the cluster file lock when the local file lock is contended;
and the file lock releasing module 24 is configured to release the local file lock when the application completes the specified task, so as to complete releasing the cluster file lock.
The setting device of the cluster file lock provided by the embodiment of the invention has the beneficial effects of the setting method of the cluster file lock disclosed in the foregoing.
Referring to fig. 3, fig. 3 is a structural diagram of a device for setting a cluster file lock according to an embodiment of the present invention, where the device includes:
a memory 31 for storing a computer program;
a processor 32, configured to execute the computer program to implement the steps of a method for setting a cluster file lock as disclosed in the foregoing.
The setting device of the cluster file lock provided by the embodiment of the invention has the beneficial effects of the setting method of the cluster file lock disclosed in the foregoing.
Correspondingly, the embodiment of the present invention further discloses a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the method for setting the cluster file lock are implemented as disclosed above.
The computer-readable storage medium provided by the embodiment of the invention has the beneficial effects of the method for setting the cluster file lock disclosed in the foregoing.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the equipment and the medium for setting the cluster file lock provided by the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method for setting cluster file lock is characterized in that the method is applied to an NAS cluster provided with a placemaker; the method comprises the following steps:
setting a target temporary file on a specified directory of the specified node of the NAS cluster by utilizing the placemaker;
when an application program of a target node needs to acquire a cluster file lock, judging whether the designated directory of the target node has the target temporary file or not;
if yes, the application program contends for a local file lock of the target temporary file, and the acquisition of the cluster file lock is completed when the local file lock is contended;
and when the application program finishes the specified task, releasing the local file lock to finish the release of the cluster file lock.
2. The setup method according to claim 1, wherein the specified directory is specifically a/dev/shm directory.
3. The setting method according to claim 1, further comprising:
when the placemaker detects that the target node is abnormal, judging whether the placemaker can obtain the local file lock;
and if so, deleting the local file lock.
4. The setting method according to claim 3, wherein after the determining whether the placemaker can obtain the process of obtaining the local file lock, the method further comprises:
if not, continuing to execute the step of judging whether the placemaker can obtain the local file lock or not after waiting for a preset time;
if yes, executing the step of deleting the local file lock;
and if not, forcing the target node to be offline.
5. The setting method according to claim 3, further comprising:
and when the placemaker detects that the target node is down, judging that the target node is abnormal.
6. The setting method according to claim 3, further comprising:
and when the placemaker detects that the time length of the local file lock occupied by the application program exceeds the preset time length, judging that the target node is abnormal.
7. A setting device of a cluster file lock is characterized by being applied to an NAS cluster provided with a placemaker; the method comprises the following steps:
the file setting module is used for setting a target temporary file on a specified directory of the specified node of the NAS cluster by utilizing the placemaker;
the file judgment module is used for judging whether the designated directory of the target node has the target temporary file or not when the application program of the target node acquires the cluster file lock;
the file lock contending module is used for contending a local file lock of the target temporary file by the application program when the judgment result of the file judgment module is yes, and finishing the acquisition of the cluster file lock when the local file lock is contended;
and the file lock releasing module is used for releasing the local file lock when the application program completes the specified task so as to complete the release of the cluster file lock.
8. A setting device of a cluster file lock is characterized by comprising:
a memory for storing a computer program;
a processor for implementing the steps of a method for setting a cluster file lock according to any one of claims 1 to 6 when executing said computer program.
9. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of a method for setting a cluster file lock according to any one of claims 1 to 6.
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| CN105760519A (en) * | 2016-02-26 | 2016-07-13 | 北京鲸鲨软件科技有限公司 | Cluster file system and file lock allocation method thereof |
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| US8655851B2 (en) * | 2011-04-08 | 2014-02-18 | Symantec Corporation | Method and system for performing a clean file lock recovery during a network filesystem server migration or failover |
| CN107562547B (en) * | 2017-08-30 | 2021-06-29 | 郑州云海信息技术有限公司 | CTDB cluster system, creation method and creation system |
| CN109408477A (en) * | 2018-10-09 | 2019-03-01 | 郑州云海信息技术有限公司 | A kind of method, system and associated component that setting group document is locked |
| CN111274214B (en) * | 2020-02-20 | 2022-08-16 | 苏州浪潮智能科技有限公司 | File lock processing method and device, electronic equipment and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105760519A (en) * | 2016-02-26 | 2016-07-13 | 北京鲸鲨软件科技有限公司 | Cluster file system and file lock allocation method thereof |
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