CN109324764B - Method and device for realizing distributed exclusive lock - Google Patents
Method and device for realizing distributed exclusive lock Download PDFInfo
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- CN109324764B CN109324764B CN201811291978.2A CN201811291978A CN109324764B CN 109324764 B CN109324764 B CN 109324764B CN 201811291978 A CN201811291978 A CN 201811291978A CN 109324764 B CN109324764 B CN 109324764B
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- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
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Abstract
The invention discloses a method and a device for realizing a distributed exclusive lock. The method relates to a virtualization computing platform technology, and solves the problem of resource residue of the distributed lock based on the RBD. The method comprises the following steps: maintaining a lease process; and when the node acquires the lock resource, registering to the lease process, and finishing the I/O operation on the distributed lock through the lease process. The technical scheme provided by the invention is suitable for the distributed locks of the Sanlock, and realizes a distributed lock system supporting lease.
Description
Technical Field
The present invention relates to a virtualized computing platform technology, and in particular, to a method and an apparatus for implementing a distributed exclusive lock.
Background
With the rapid development of computer technology and network technology, large clusters are widely used in practical production environments. The server cluster is virtualized to form a cloud computing platform virtualization system, in the virtualization system, coordination action is often needed, different systems or different hosts of the same system share the same or a group of resources, mutual exclusion is often needed to prevent mutual interference and ensure consistency, and therefore a distributed lock is needed to ensure normal operation of the system under the conditions.
Distributed locks generally need to support use in large-scale environments, and therefore, a leased distributed lock needs to be used to ensure the uniqueness of a node that acquires a lock resource, and to ensure that the same node acquires the resource uniquely. Since the acquirer of the distributed lock is a member of the host in the cluster, the implementation of the distributed lock is divided into two types: one is a network type, DLM implementation; one is a shared storage type, namely sanlock implementation. However, sanlock does not support ceph's reliable automatic distributed storage block device (RBD), and therefore a set of RBD-based distributed lock system needs to be implemented. In the existing RBD-based distributed lock system, when a node is off-line or a network is disconnected, lock resources are easy to remain.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method and a device for realizing a distributed exclusive lock. The method manages the lock resources through the lease process, and solves the problem of resource residue of the distributed lock based on the RBD.
In order to achieve the purpose of the invention, the invention provides a method for realizing a distributed exclusive lock, which comprises the following steps:
maintaining a lease process;
and when the node acquires the lock resource, registering to the lease process, and finishing the I/O operation on the distributed lock through the lease process.
Preferably, the method further comprises:
and sending the timestamp of the node to the storage pool of the distributed lock at regular time to indicate that the node is online.
Preferably, the method further comprises:
and when the timestamp of the node update is not received at a preset detection interval, judging that the node is offline.
Preferably, the method further comprises:
and releasing the lock resources occupied by the nodes after detecting that the nodes are offline.
Preferably, when acquiring the lock resource, the node registers to the lease process, and before the step of completing the I/O operation on the distributed lock by the lease process, the method further includes:
inquiring the lock information, and inquiring a host occupying the lock resource according to the identifier of the lock resource requested by the node;
and when the lock resource is not occupied by any host or the host occupying the lock resource is offline, allocating the lock resource to the node.
Preferably, the identification of the lock resource includes process ID information and node ID information of the lease process.
Preferably, the method further comprises:
and when the lease process is terminated, releasing all lock resources involved by the lease process.
The invention also provides a device for realizing the distributed exclusive lock, which comprises:
the process management module is used for maintaining the lease process;
and the I/O operation module is used for registering to the lease process when the lock resource is acquired, and finishing the I/O operation on the distributed lock through the lease process.
Preferably, the apparatus further comprises:
and the detection module is used for receiving the time stamp which is issued to the storage pool of the distributed lock at regular time and judging that the node is off line when the time stamp updated by the node is not received at a preset detection interval.
Preferably, the apparatus further comprises:
a lock resource storage pool, which is used for releasing the lock resources occupied by the nodes after detecting that the nodes are off-line,
and when the lease process is terminated, releasing all lock resources involved by the lease process.
The invention provides a method and a device for realizing a distributed exclusive lock, which maintain a lease process, register to the lease process when a node acquires a lock resource, and complete I/O operation on the distributed lock through the lease process. The distributed lock system supporting lease is realized, and the problem of resource residue of the distributed lock based on RBD is solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a flowchart illustrating a method for implementing a distributed exclusive lock according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for implementing a distributed exclusive lock according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an apparatus for implementing a distributed exclusive lock according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In the existing RBD-based distributed lock system, when a node is off-line or a network is disconnected, lock resources are easy to remain.
In order to solve the above problem, an embodiment of the present invention provides a method for implementing a distributed exclusive lock, where a flow of implementing a distributed lock using the method is shown in fig. 1, and includes:
In the embodiment of the invention, a lease process is added, and the lock acquisition flow of the RBD is modified, so that a set of distributed exclusive locks with leases from the RBD is realized.
And 102, inquiring locking information, and inquiring a host occupying the locking resource according to the identifier of the locking resource requested by the node.
In the embodiment of the invention, unique lock resource identifiers are distributed to clients (clients) of all nodes of the RBD, each identifier corresponds to an I/O block lock resource of the Client, and the lease process carries out I/O time stamping on the lock resource at regular time, thereby proving that the node is alive.
In the embodiment of the present invention, the identifier of the lock resource includes process ID information and node ID information of the lease process.
And 103, when the lock resource is not occupied by any host or the host occupying the lock resource is offline, allocating the lock resource to the node.
In the embodiment of the invention, the lease process carries out I/O on the own lock resource, when the I/O cannot be issued in a certain time, the storage is considered to be unreachable, all processes for acquiring the RBD storage pool need to be stopped, and the updating of the timestamp of the lease process is stopped.
And step 104, when the node acquires the lock resource, registering to the lease process, and completing the I/O operation on the distributed lock through the lease process.
In this step, the lease process needs to perform resource management operation, that is, when each lease process acquires a lock resource, the lease process must register the ID of the annotation process, the lock resource information acquired by the process, and the ID of the lock resource written when the lease process acquires the lock resource is the ID information agreed by the lease process.
And the lease process carries out the management operation of the lock resource, detects the process state of the acquired lock resource, and actively releases the lock resource acquired by the process when the process is terminated unexpectedly.
And 105, when the lease process is ended, releasing all lock resources related to the lease process.
An embodiment of the present invention further provides a method for implementing a distributed exclusive lock, where when lock resource management is performed, lock resources are managed by detecting an online state of a node, and a specific process is shown in fig. 2, where the method includes:
and step 201, issuing the timestamp of the node to the storage pool of the distributed lock at regular time, and indicating that the node is online.
In the embodiment of the invention, a lock resource acquisition process of an RBD is modified, when the lock resource of the RBD is acquired, an identifier of the lock resource needs to be acquired from a lease process, then a detection mechanism of the lock resource is carried out, when no process acquires the lock resource, the lock resource is directly acquired by an ID process of the current lock resource, when a node acquires the lock of the resource, ID information of the resource is read, the ID information of the node is distinguished through the ID information of the lock resource, then timestamp information of the node occupying the lock resource is read, whether the node is alive or not is judged, if the node acquiring the lock resource is alive, the lock is failed to acquire, the node is failed to roll back, if the node is offline, the lock resource owned by the original node is released, and then the own lock resource is acquired.
It should be noted that the node survival detection process shown in fig. 2 and the distributed lock resource management process shown in fig. 1 are not strictly time-series relationships. According to the on-line or off-line detection result of the node, the lock resource occupied by the node can be adjusted at any time.
An embodiment of the present invention further provides a method for implementing a distributed exclusive lock, which implements lease information of an RBD, thereby implementing an RBD-based distributed lock with a lease.
The embodiment of the invention provides a lease mechanism and a lock management mechanism, the uniqueness of a cluster node is marked by a unique ID of each node, the timed refresh of an RBD is realized by regularly performing I/O (input/output) on a volume in a storage pool of the RBD to issue a timestamp, the node is considered to be online, and the condition that other hosts cannot acquire lock resources acquired by the node under the condition that the node is alive is ensured, so that the exclusivity is ensured.
And marking the ID of the node owned by the resource lock by customizing the identification of the resource lock of the RBD. Whether the node is offline and can acquire lock resources acquired by other nodes is judged by checking the refreshing time of the timestamp, and whether the timestamp can be issued by the current node is judged by checking the I/O information of the current node to the RBD, and the nonce operation is executed after the timestamp cannot be issued for a certain time, so that the node manages the lock resources in the RBD storage pool.
The resource lock of the RBD image performs locking operation by executing a lock add (lock add), and the lock resources are distinguished by introducing a unique resource lock identification (lock ID), so that the lock ID can be customized to manage the lock resources. For example, the lock ID consists of both the host ID information of the lock holding the resource and the ID of the lease process acquiring the resource of the lock.
The lease of the distributed exclusive lock with RBD lease is realized by sending down the time stamp of the node to one volume in the RBD storage pool in a timed mode. The node is proved to survive through the refreshing of the timestamp of the node, the node is considered to be offline if the timestamp is not refreshed within a certain time (for example, preset detection time), and the lock resource of the offline node is released, so that the lock resource of the offline node can be acquired.
When the RBD lock resource is acquired, image lock information is required to be inquired first, and if the lock resource is not acquired currently, the image lock information can be acquired directly; if the lock resource is acquired, the ID of the host (namely the node) acquiring the lock resource is judged through the last four digits of the host contained in the identification of the lock resource, and the timestamp record of the resource lock corresponding to the host is read through the ID information of the host to judge whether the node is online.
The lease process also needs to manage the process for acquiring the lock resource, and when the lease process is terminated, the lock resource acquired by the lease process is actively released.
The lease process uses the starting time of the nodes as the time stamps to issue, so that the problem that the time stamps are different due to time modification of a user is avoided, and the time stamps of all the nodes are ensured to be on the same axis. Meanwhile, the mark of the lease process is modified when the lease process is restarted, so that the problem that the original released resource lock is occupied due to restart is avoided.
When the lease process is restarted, all the acquired lock resources need to be released, and all the lock acquisition processes are stopped (kill), so that the problem that the original acquired lock resources cannot be released because a new resource lock identification is updated is solved.
An embodiment of the present invention further provides an apparatus for implementing a distributed exclusive lock, where the structure of the apparatus is shown in fig. 3, and the apparatus includes:
a process management module 301, configured to maintain a lease process;
and the I/O operation module 302 is configured to register to the lease process when acquiring the lock resource, and complete an I/O operation on the distributed lock through the lease process.
Preferably, the apparatus further comprises:
the detecting module 303 is configured to receive a timestamp issued to the node to the storage pool of the distributed lock at regular time, and determine that the node is offline when the timestamp updated by the node is not received at a preset detection interval.
Preferably, the apparatus further comprises:
a lock resource storage pool 304, configured to release the lock resource occupied by the node after detecting that the node is offline,
and when the lease process is terminated, releasing all lock resources involved by the lease process.
The embodiment of the invention provides a method and a device for realizing a distributed exclusive lock, which maintain a lease process, register the lease process when a node acquires a lock resource, and complete I/O operation on the distributed lock through the lease process. The distributed lock system supporting lease is realized, and the problem of resource residue of the distributed lock based on RBD is solved. According to the invention, through adding the lease process and modifying the RBD lock acquisition process, the distributed exclusive lock with the lease of the ceph-supporting RBD is realized, the timestamp is refreshed at the fixed time of the lease process, so that the lease of the RBD lock is realized, the RBD can be normally shared to all cluster nodes under a cluster, the RBD can be suitable for cluster storage, and the consistency of cluster data is ensured.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (7)
1. A method for implementing a distributed exclusive lock, comprising:
maintaining a lease process;
when the node acquires the lock resource, registering to the lease process, and completing the I/O operation on the distributed lock through the lease process;
the method further comprises the following steps:
issuing a timestamp of the node to the storage pool of the distributed lock at regular time to indicate that the node is online;
and when the timestamp of the node update is not received at a preset detection interval, judging that the node is offline.
2. The method for implementing a distributed exclusive lock according to claim 1, further comprising:
and releasing the lock resources occupied by the nodes after detecting that the nodes are offline.
3. The method according to claim 1, wherein a node registers to the lease process when acquiring a lock resource, and before the step of completing an I/O operation on the distributed lock by the lease process, the method further comprises:
inquiring the lock information, and inquiring a host occupying the lock resource according to the identifier of the lock resource requested by the node;
and when the lock resource is not occupied by any host or the host occupying the lock resource is offline, allocating the lock resource to the node.
4. The method of claim 3, wherein the identification of the lock resource comprises process ID information and node ID information of the lease process.
5. The method for implementing a distributed exclusive lock according to claim 1, further comprising:
and when the lease process is terminated, releasing all lock resources involved by the lease process.
6. An apparatus for implementing a distributed exclusive lock, comprising:
the process management module is used for maintaining the lease process;
the I/O operation module is used for registering to the lease process when lock resources are acquired, and finishing I/O operation on the distributed lock through the lease process;
the device also includes:
and the detection module is used for receiving the time stamp of the node which is issued to the storage pool of the distributed lock at regular time and judging that the node is off line when the time stamp updated by the node is not received at a preset detection interval.
7. The apparatus for implementing a distributed exclusive lock according to claim 6, further comprising:
a lock resource storage pool, which is used for releasing the lock resources occupied by the nodes after detecting that the nodes are off-line,
and when the lease process is terminated, releasing all lock resources involved by the lease process.
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| CN112667349B (en) * | 2020-12-23 | 2023-03-07 | 浪潮云信息技术股份公司 | Kubernetes-based distributed election method |
| CN113342507B (en) * | 2021-07-07 | 2024-03-29 | 湖南四方天箭信息科技有限公司 | Distributed lock service realization method and device and computer equipment |
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| CN107124324A (en) * | 2016-02-25 | 2017-09-01 | 阿里巴巴集团控股有限公司 | A kind of heart-beat protocol method and apparatus based on lease |
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| US7124131B2 (en) * | 2003-04-29 | 2006-10-17 | International Business Machines Corporation | Discipline for lock reassertion in a distributed file system |
| US8543781B2 (en) * | 2004-02-06 | 2013-09-24 | Vmware, Inc. | Hybrid locking using network and on-disk based schemes |
| US20060184528A1 (en) * | 2005-02-14 | 2006-08-17 | International Business Machines Corporation | Distributed database with device-served leases |
| US9575985B2 (en) * | 2009-12-07 | 2017-02-21 | Novell, Inc. | Distributed lock administration |
| CN104702655B (en) * | 2014-03-21 | 2018-04-27 | 杭州海康威视系统技术有限公司 | Cloud storage resource allocation methods and its system |
| US9959176B2 (en) * | 2016-02-22 | 2018-05-01 | Red Hat Inc. | Failure recovery in shared storage operations |
| CN107516048B (en) * | 2016-06-16 | 2021-01-08 | 阿里巴巴集团控股有限公司 | Method and equipment for controlling file access in distributed file system |
| CN106648903B (en) * | 2017-01-03 | 2019-03-26 | 北京百度网讯科技有限公司 | The method and apparatus for calling distributed file system |
| CN107360245B (en) * | 2017-07-28 | 2020-10-16 | 苏州浪潮智能科技有限公司 | Local caching method and device based on lease lock mechanism |
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| CN107124324A (en) * | 2016-02-25 | 2017-09-01 | 阿里巴巴集团控股有限公司 | A kind of heart-beat protocol method and apparatus based on lease |
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