CN114722029B - Method, system, equipment and storage medium for repairing monitor database - Google Patents
Method, system, equipment and storage medium for repairing monitor database Download PDFInfo
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- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/27—Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
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Abstract
The invention provides a method, a system, equipment and a storage medium for repairing a monitor database, wherein the method comprises the following steps: in response to a failure to open kvstore when a monitor is started, creating a new directory, and creating a new kvstore in the new directory; writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors; transmitting a data synchronization message to pull data from other monitors in response to receiving a preset type message returned by the other monitors; and switching the new database and the old database in response to the repair mark being completed. The invention improves the fault tolerance of the cluster Monitor, solves the problem that the system abnormal power-down Monitor database cannot be started after being damaged, automatically repairs the damaged database, and improves the fault tolerance and the competitiveness of products.
Description
Technical Field
The present invention relates to the field of distributed file systems, and more particularly, to a method, system, device, and storage medium for repairing a monitor database.
Background
Monitor modules are core modules of a distributed file system. The main functions of the Monitor module are to manage the clusters and Monitor the various states of the clusters. Monitor is responsible for managing various maps (figures) of the cluster, such as OSDMap (OSDMonitor is responsible for management), PGMap (PGMonior is responsible for management), mdsma (mds Monitor is responsible for management), and the like. Various maps managed by Monitor are stored in a database, and Monitor uses kvstore (type of Monitor database) to store data. The Monitor maintains consistency of the maps of the cluster, so the data of multiple Monitor modules in the cluster are consistent, i.e., the data stored in kvstores are identical. The data stored in the kvstore can ensure that the Monitor can reload the data in the kvstore to restore to normal after the Monitor fails. It follows that the data in kvstore is critical to Monitor.
The kvstore of Monitor is disposed on a physical medium such as SSD (solid state disk) or HDD (mechanical hard disk). When the system is abnormally powered off, the kvstore database file of the Monitor has a small probability of being damaged, so that the Monitor cannot be started after the node is powered on. And after the problem occurs, the Monitor with the fault can be removed from the cluster only by manual intervention, and then a new Monitor is newly expanded to enter the cluster. If the cluster is not inspected timely, monitor faults cannot be removed timely, multiple Monitor successive faults can be caused after multiple abnormal power failures, and finally the Monitor cannot meet the requirements of the minimum committee, so that the cluster is not available or even cannot be recovered (the database of all monitors is damaged).
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a method, a system, a computer device and a computer readable storage medium for repairing a Monitor database, which improve the fault tolerance of a cluster Monitor, solve the problem that the Monitor database cannot be started after being damaged due to abnormal power failure of the system, automatically repair the damaged database, and improve the fault tolerance and the competitiveness of products.
Based on the above objects, an aspect of the embodiments of the present invention provides a method for repairing a monitor database, including the following steps: in response to a failure to open kvstore when a monitor is started, creating a new directory, and creating a new kvstore in the new directory; writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors; transmitting a data synchronization message to pull data from other monitors in response to receiving a preset type message returned by the other monitors; and switching the new database and the old database in response to the repair mark being completed.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and in response to the fact that the first version information of the sender of the message of the preset type is larger than a preset value and the second version information of the monitor to be repaired is smaller than the first version information of the sender, clearing kvstore of the monitor to be repaired, and sending a data synchronization message to the sender to ask for the full data.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
In some embodiments, the switching between the new database and the old database comprises: closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
In another aspect of the embodiments of the present invention, there is provided a system for repairing a monitor database, including: the creation module is configured to respond to failure of opening kvstore when the monitor is started, create a new catalog and create a new kvstore in the new catalog; the sending module is configured to write a repair mark into the new kvstore and send broadcast detection messages to other monitors; the acquisition module is configured to respond to the received preset type message returned by the other monitor, and send a data synchronization message to pull data from the other monitor; and the switching module is configured to switch the new database and the old database in response to the repair mark being repaired.
In some embodiments, the acquisition module is configured to: and in response to the fact that the first version information of the sender of the message of the preset type is larger than a preset value and the second version information of the monitor to be repaired is smaller than the first version information of the sender, clearing kvstore of the monitor to be repaired, and sending a data synchronization message to the sender to ask for the full data.
In some embodiments, the acquisition module is configured to: and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
In some embodiments, the switching module is configured to: closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
In yet another aspect of the embodiment of the present invention, there is also provided a computer apparatus, including: at least one processor; and a memory storing computer instructions executable on the processor, which when executed by the processor, perform the steps of the method as above.
In yet another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium storing a computer program which, when executed by a processor, implements the method steps as described above.
The invention has the following beneficial technical effects: the fault tolerance of the cluster Monitor is improved, the problem that the system cannot be started after the abnormal power-down Monitor database is damaged is solved, the damaged database is automatically repaired, and the fault tolerance and the competitiveness of products are improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an embodiment of a method for repairing a monitor database according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of a system for repairing a monitor database according to the present invention;
FIG. 3 is a schematic diagram of a hardware architecture of an embodiment of a computer device for repairing a monitor database according to the present invention;
fig. 4 is a schematic diagram of an embodiment of a computer storage medium for repairing a monitor database according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
It should be noted that, in the embodiments of the present invention, all the expressions "first" and "second" are used to distinguish two entities with the same name but different entities or different parameters, and it is noted that the "first" and "second" are only used for convenience of expression, and should not be construed as limiting the embodiments of the present invention, and the following embodiments are not described one by one.
In a first aspect of the embodiment of the present invention, an embodiment of a method for repairing a monitor database is provided. Fig. 1 is a schematic diagram of an embodiment of a method for repairing a monitor database according to the present invention. As shown in fig. 1, the embodiment of the present invention includes the following steps:
s1, responding to failure of opening kvstore when a monitor is started, creating a new catalog, and creating a new kvstore in the new catalog;
s2, writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors;
s3, responding to the received preset type information returned by the other monitors, and sending a data synchronization message to pull data from the other monitors; and
and S4, switching the new database and the old database in response to the repair mark being repaired.
In response to a failure to open a kvstore upon startup of the monitor, a new directory is created and a new kvstore is created in the new directory.
If the Monitor fails to open the kvstore, the Monitor retries for 3 times, and if the Monitor fails to open the kvstore, a new directory is created after the retry, and a new kvstore is created in the new directory. Checking whether a new catalog exists or not, creating the new catalog if the new catalog exists, checking whether a new kvstore exists or not if the new catalog exists, creating the new kvstore if the new kvstore exists, indicating that the damaged database is being repaired, interrupting the recovery process due to power failure and the like, and continuing to repair after restarting, wherein the new kvstore is opened.
And writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors. Checking whether the repair mark exists or not, if not, writing the repair mark, and if so, starting repair. If the repair mark exists, checking the state of the repair mark, and if the state of the repair mark is that repair is started, sending broadcast detection messages to other monitors, and detecting the states of the other monitors and version information (first version information and second version information) in kvstore. And when other monitors receive the detection message, the current committee member information and version information (first_version) in own local kvstore are sent to the Monitor of the database to be repaired, and the sent message is a probe_reply message. When receiving the detection message, the method needs to check whether the detection message has a repair mark or not, and if the detection message is also in the repair database, the method does not respond to the detection message.
And sending a data synchronization message to pull data from other monitors in response to receiving the preset type message returned by the other monitors. When the Monitor to be repaired receives the probe_reply, a data synchronization message (Sync message) is sent to pull the data from other monitors.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and in response to the fact that the first version information of the sender of the message of the preset type is larger than a preset value and the second version information of the monitor to be repaired is smaller than the first version information of the sender, clearing kvstore of the monitor to be repaired, and sending a data synchronization message to the sender to ask for the full data. And if the first version of the sender of the probe_reply is greater than 1 and the last version in the kvstore database of the Monitor to be repaired is smaller than the first version of the sender, emptying the kvstore of the Monitor to be repaired. And then sends a data synchronization message (Sync message, type get_data_full) to the sender to ask for the full amount of data.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender. If the last_version of the kvstore database of the Monitor to be repaired plus 10 is smaller than the last_version of the sender, it is indicated that the kvstore has repaired part of the data, and a data synchronization message (Sync message, type get_data_record) is sent to request the incremental data. And sending the data in the kvstore to the Monitor to be repaired for a plurality of times when receiving the Sync. And after the Monitor to be repaired synchronizes the data, modifying the repair mark into a repair completion state.
And switching the new database and the old database in response to the repair mark being completed.
In some embodiments, the switching between the new database and the old database comprises: closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory. Specifically, closing the repaired new kvstore, deleting the damaged database catalog, renaming the repaired new kvstore to the original database catalog, opening the kvstore, deleting the repair mark, carrying out an initialization process again, and initiating election to rejoin the committee of the Monitor.
The invention improves the fault tolerance of the cluster Monitor, solves the problem that the system abnormal power-down Monitor database cannot be started after being damaged, automatically repairs the damaged database, and improves the fault tolerance and the competitiveness of products.
It should be noted that, in the foregoing method for repairing a monitor database, the steps in the various embodiments may be intersected, replaced, added and deleted, so that the method for repairing a monitor database by using these reasonable permutation and combination transforms shall also belong to the protection scope of the present invention, and shall not limit the protection scope of the present invention to the embodiments.
Based on the above objects, a second aspect of the embodiments of the present invention provides a system for repairing monitor databases. As shown in fig. 2, the system 200 includes the following modules: the creation module is configured to respond to failure of opening kvstore when the monitor is started, create a new catalog and create a new kvstore in the new catalog; the sending module is configured to write a repair mark into the new kvstore and send broadcast detection messages to other monitors; the acquisition module is configured to respond to the received preset type message returned by the other monitor, and send a data synchronization message to pull data from the other monitor; and the switching module is configured to switch the new database and the old database in response to the repair mark being repaired.
In some embodiments, the acquisition module is configured to: and in response to the fact that the first version information of the sender of the message of the preset type is larger than a preset value and the second version information of the monitor to be repaired is smaller than the first version information of the sender, clearing kvstore of the monitor to be repaired, and sending a data synchronization message to the sender to ask for the full data.
In some embodiments, the acquisition module is configured to: and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
In some embodiments, the switching module is configured to: closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
In view of the above object, a third aspect of the embodiments of the present invention provides a computer device, including: at least one processor; and a memory storing computer instructions executable on the processor, the instructions being executable by the processor to perform the steps of: s1, responding to failure of opening kvstore when a monitor is started, creating a new catalog, and creating a new kvstore in the new catalog; s2, writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors; s3, responding to the received preset type information returned by the other monitors, and sending a data synchronization message to pull data from the other monitors; and S4, switching the new database and the old database in response to the repair mark being completed.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and in response to the fact that the first version information of the sender of the message of the preset type is larger than a preset value and the second version information of the monitor to be repaired is smaller than the first version information of the sender, clearing kvstore of the monitor to be repaired, and sending a data synchronization message to the sender to ask for the full data.
In some embodiments, the sending the data synchronization message to pull data from other monitors includes: and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
In some embodiments, the switching between the new database and the old database comprises: closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
Fig. 3 is a schematic hardware structure of an embodiment of the computer device for repairing monitor databases according to the present invention.
Taking the example of the device shown in fig. 3, a processor 301 and a memory 302 are included in the device.
The processor 301 and the memory 302 may be connected by a bus or otherwise, for example in fig. 3.
The memory 302 is used as a non-volatile computer readable storage medium, and may be used to store non-volatile software programs, non-volatile computer executable programs, and modules, such as program instructions/modules corresponding to the method for repairing monitor databases in the embodiments of the present application. The processor 301 executes various functional applications of the server and data processing, i.e., a method of repairing monitor databases, by running nonvolatile software programs, instructions, and modules stored in the memory 302.
Memory 302 may include a storage program area that may store an operating system, at least one application program required for functionality, and a storage data area; the storage data area may store data created according to the use of a method of repairing a monitor database, etc. In addition, memory 302 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, memory 302 may optionally include memory located remotely from processor 301, which may be connected to the local module via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Computer instructions 303 corresponding to one or more methods of repairing a monitor database are stored in memory 302, which when executed by processor 301, perform the methods of repairing a monitor database in any of the method embodiments described above.
Any one embodiment of a computer device that performs the method for repairing a monitor database described above may achieve the same or similar effects as any of the method embodiments described above.
The invention also provides a computer readable storage medium storing a computer program which when executed by a processor performs a method of repairing a monitor database.
Fig. 4 is a schematic diagram of an embodiment of the computer storage medium for repairing a monitor database according to the present invention. Taking a computer storage medium as shown in fig. 4 as an example, the computer readable storage medium 401 stores a computer program 402 that when executed by a processor performs the above method.
Finally, it should be noted that, as will be appreciated by those skilled in the art, implementing all or part of the above-described methods in the embodiments, the program for repairing a monitor database may be stored in a computer readable storage medium, and the program may include the steps of the above-described embodiments when executed. The storage medium of the program may be a magnetic disk, an optical disk, a read-only memory (ROM), a random-access memory (RAM), or the like. The computer program embodiments described above may achieve the same or similar effects as any of the method embodiments described above.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The foregoing embodiment of the present invention has been disclosed with reference to the number of embodiments for the purpose of description only, and does not represent the advantages or disadvantages of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, and the program may be stored in a computer readable storage medium, where the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and many other variations of the different aspects of the embodiments of the invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present invention.
Claims (6)
1. A method of repairing a monitor database, comprising the steps of:
in response to a failure to open kvstore when a monitor is started, creating a new directory, and creating a new kvstore in the new directory;
writing a repair mark into the new kvstore, and sending broadcast detection messages to other monitors;
transmitting a data synchronization message to pull data from other monitors in response to receiving a preset type message returned by the other monitors; and
in response to the repair being marked as completed, performing a handoff of the new and old databases,
the sending the data synchronization message to pull data from other monitors includes:
responsive to the first version information of the sender of the pre-set type message being greater than a pre-set value and the second version information of the monitor to be repaired being less than the first version information of the sender, emptying kvstore of the monitor to be repaired and sending a data synchronization message to the sender requesting full amount of data,
the sending the data synchronization message to pull data from other monitors includes:
and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
2. The method of claim 1, wherein the performing a handoff of the new and old databases comprises:
closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
3. A system for repairing a monitor database, comprising:
the creation module is configured to respond to failure of opening kvstore when the monitor is started, create a new catalog and create a new kvstore in the new catalog;
the sending module is configured to write a repair mark into the new kvstore and send broadcast detection messages to other monitors;
the acquisition module is configured to respond to the received preset type message returned by the other monitor, and send a data synchronization message to pull data from the other monitor; and
a switching module configured to switch between the new database and the old database in response to the repair flag being completed,
the acquisition module is configured to:
responsive to the first version information of the sender of the pre-set type message being greater than a pre-set value and the second version information of the monitor to be repaired being less than the first version information of the sender, emptying kvstore of the monitor to be repaired and sending a data synchronization message to the sender requesting full amount of data,
the acquisition module is configured to:
and transmitting a data synchronization message to the sender to ask for incremental data in response to the second version information of the monitor to be repaired plus the second version information of which the first number is smaller than that of the sender.
4. A system according to claim 3, wherein the switching module is configured to:
closing the repaired new kvstore, deleting the damaged database directory, and renaming the repaired new kvstore to the original database directory.
5. A computer device, comprising:
at least one processor; and
a memory storing computer instructions executable on the processor, which when executed by the processor, perform the steps of the method of any one of claims 1-2.
6. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method of any one of claims 1-2.
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| CN113821377A (en) * | 2021-08-27 | 2021-12-21 | 济南浪潮数据技术有限公司 | Data recovery method, system and storage medium of distributed storage cluster |
| CN113722155A (en) * | 2021-11-01 | 2021-11-30 | 苏州浪潮智能科技有限公司 | Data backup and repair method in distributed file system and related components |
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