CN114338370A - Ambari's high availability method, system, apparatus, electronic device and storage medium - Google Patents

Abstract

The application relates to a high-availability method, a system, a device, electronic equipment and a storage medium of Ambari, which are applied to the technical field of service management, wherein the method comprises the following steps: when the abnormality of the current main central node is monitored, deleting first equipment information written in the distributed coordinator by the current main central node, wherein the current main central node is one of at least two central nodes; sending a writable signal to at least one central node, so that the at least one central node writes own second equipment information into the distributed coordinator according to the writable signal; determining a target central node in which the second equipment information is successfully written in at least one central node; and sending a switching signal to the target central node so that the target central node switches the main state from the standby state to the main state according to the switching signal.

Description

Ambari's high availability method, system, apparatus, electronic device, and storage medium

technical field

The present application relates to the technical field of service management, and in particular, to an Ambari high-availability method, system, apparatus, electronic device and storage medium.

Background technique

Ambari is a web-based tool that supports provisioning, management, and monitoring of Apache Hadoop clusters.

Usually, Ambari is divided into two roles: master and slave. The master is the central node. The master manages the slave node and controls the slave to execute commands. Usually the master is in a single-point mode, with a low fault tolerance rate, and there will be a single point of failure. Once the master fails and becomes unavailable, the project cannot run normally; and high availability is not supported.

In related technologies, the Ambari high-availability solution is mainly a DNS-based cold backup solution. Specifically, when the master fails, the operation and maintenance personnel modify the DNS configuration so that the slave can resolve the IP of the new master to connect to the new master. However, in this way, manual intervention is required to recover the fault, and the service is unavailable before manual intervention.

SUMMARY OF THE INVENTION

The present application provides an Ambari high-availability method, system, device, electronic device, and storage medium to solve the problem in the prior art that manual intervention is required to restore faults, and services are unavailable before manual intervention.

In a first aspect, an embodiment of the present application provides an Ambari high availability method, which is applied to a distributed coordinator, where the distributed coordinator is linked with at least two central nodes, and the method includes:

After detecting that the current main center node is abnormal, delete the first device information written by the current main center node in the distributed coordinator; the current main center node is one of the at least two center nodes;

sending a writable signal to at least one of the central nodes, so that the at least one central node writes its own second device information to the distributed coordinator according to the writable signal;

Determine at least one of the central nodes, the target central node to which the second device information is successfully written;

A switching signal is sent to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal.

Optionally, the abnormality of the current main center node is detected, including:

It is detected that the duration of the abnormal link with the current main central node exceeds the first preset duration.

Optionally, the first preset duration is greater than the second preset duration, and the second preset duration is greater than the heartbeat period of the link between the distributed coordinator and the current master central node.

Optionally, the distributed coordinator includes a master node and at least two first slave nodes; the determining of the center node, the target center node that successfully writes the second device information, includes:

After the second device information of the central node is written into the master node, the second device information is sequentially synchronized to the at least two first slave nodes through the master node;

The first central node whose number of synchronized first slave nodes reaches a preset value is determined as the target central node that successfully writes the second device information.

Optionally, the preset value is half of the total number of the first slave nodes.

Optionally, the distributed coordinator is zookeeper or etcd.

In the second aspect, an embodiment of the present application provides an Ambari high availability method, which is applied to a central node, including:

Obtain a writable signal sent by the distributed coordinator, where the writable signal is the first device information written by the distributed coordinator in the target node of the distributed coordinator after the distributed coordinator deletes the current main center node sent;

According to the writable signal, write its own second device information to the distributed coordinator;

obtaining the handover signal sent by the distributed coordinator;

The active/standby state is switched from the standby state to the main state according to the switch signal.

Optionally, also include:

Obtain the access request sent by the second slave node;

If the active/standby state is the master state, respond to the access request and establish a link with the second slave node.

In a third aspect, an embodiment of the present application provides an Ambari high-availability system, including: a distributed coordinator and at least two central nodes, the distributed coordinator is linked with the at least two central nodes;

The distributed coordinator is used to delete the first device information written by the current main center node in the target node of the distributed coordinator after monitoring that the current main center node is abnormal; The node sends a writable signal; the current main central node is one of the at least two central nodes;

the central node, configured to send its own second device information to the distributed coordinator according to the writable signal;

The distributed coordinator is further configured to determine, in the central node, the target central node to which the second device information is successfully written;

The central node is further configured to switch the active-standby state from the standby state to the active state according to the switching signal.

Optionally, it also includes: at least one second slave node;

the second slave node, configured to send an access request to the central node;

The central node is further configured to obtain an access request sent by the second slave node; and when the master-standby state is the master state, respond to the access request and establish a link with the second slave node.

In a fourth aspect, an embodiment of the present application provides a high-availability device for Ambari, including:

a deletion module, configured to delete the first device information written in the distributed coordinator by the current main central node after monitoring the abnormality of the current main central node; the distributed coordinator is linked with at least two central nodes, The current main central node is one of the at least two central nodes;

a first sending module, configured to send a writable signal to at least one of the central nodes, so that the at least one central node writes its own second device information to the distributed coordinator according to the writable signal ;

a determining module, configured to determine, in the at least one central node, the target central node to which the second device information is successfully written;

The second sending module is configured to send a switching signal to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal.

In a fifth aspect, an embodiment of the present application provides a high-availability device for Ambari, including:

The first obtaining module is configured to obtain a writable signal sent by the distributed coordinator, where the writable signal is written by the distributed coordinator in the target node of the distributed coordinator when the current main center node is deleted. sent after the entered first device information; the distributed coordinator is linked with at least two central nodes, and the current main central node is one of the at least two central nodes;

a writing module, configured to write its own second device information to the distributed coordinator according to the writable signal;

a second acquiring module, configured to acquire the handover signal sent by the distributed coordinator;

The switching module is configured to switch the active-standby state from the standby state to the main state according to the switching signal.

In a sixth aspect, an embodiment of the present application provides an electronic device, including: a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus;

the memory for storing computer programs;

The processor is configured to execute the program stored in the memory to implement the high availability method of Ambari according to the first aspect or the second aspect.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the high-availability method of Ambari described in the first aspect or the second aspect is implemented.

Compared with the prior art, the above technical solutions provided by the embodiments of the present application have the following advantages: the method provided by the embodiments of the present application deletes the current main center node in the distributed coordinator after monitoring that the current main center node is abnormal. The written first device information; the current main central node is one of at least two central nodes; send a writable signal to at least one central node, so that at least one central node writes to the distributed coordinator according to the writable signal its own second device information; determine the target central node that successfully writes the second device information in at least one central node; send a switching signal to the target central node, so that the target central node switches the active-standby state from the standby state according to the switching signal main state. In this way, the central node is managed by the distributed coordinator. After monitoring the abnormality of the current main central node, the first device information written by the current main central node is deleted, so that other central nodes can write their own second device information. After entering the distributed coordinator, the active/standby state of the central node that successfully writes the second device information is switched to the main state. Therefore, without manual participation, the central node actively writes the second device information after receiving the write signal. , and then determine the new main center node, the application is more convenient.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. In other words, on the premise of no creative labor, other drawings can also be obtained from these drawings.

FIG. 1 is a structural diagram of a high availability system of Ambari provided by an embodiment of the present application;

2 is a flowchart of a high availability method of Ambari provided by an embodiment of the present application;

3 is a flowchart of a high availability method of Ambari provided by another embodiment of the present application;

4 is a structural diagram of a high availability system of Ambari provided by another embodiment of the present application;

FIG. 5 is a structural diagram of a high availability device of Ambari provided by an embodiment of the application;

6 is a structural diagram of a high availability device of Ambari provided by another embodiment of the present application;

FIG. 7 is a structural diagram of an electronic device provided by an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

Before the embodiments of the present invention are further described in detail, the terms and terms involved in the embodiments of the present invention are described, and the terms and terms involved in the embodiments of the present invention are applicable to the following explanations.

High availability: HA (High Availability) is one of the factors that must be considered in the design of distributed system architecture. It usually refers to reducing the time when the system cannot provide services through design.

Ambari: is a web-based tool that supports provisioning, management, and monitoring of Apache Hadoop clusters. Ambari already supports most Hadoop components, including HDFS, MapReduce, Hive, Pig, Hbase, Zookeeper, Sqoop, and Hcatalog, among others.

zookeeper: zookeeper is a distributed, open source distributed application coordination service.

LB: Load balancing service.

etcd is a distributed, highly available, consistent key-value storage database, implemented based on Go language, mainly used for shared configuration and service discovery. etcd is a key-value warehouse with high availability and strong consistency. It has been widely used in many distributed system architectures. The most classic usage scenario is service discovery.

An embodiment of the present application provides an Ambari high-availability system. FIG. 1 is a schematic structural diagram of an optional Ambari high-availability system according to an embodiment of the present application. As shown in FIG. 1 , the system may include: Distributed coordinator and at least two central nodes (master). in:

The distributed coordinator is used to delete the first device information written by the current main center node in the target node of the distributed coordinator after monitoring the abnormality of the current main center node; and send a writable signal to at least one center node ;

a central node, configured to send its own second device information to the distributed coordinator according to the writable signal;

The distributed coordinator is also used to determine, in the central node, the target central node to which the second device information is successfully written;

The central node is also used to switch the active-standby state from the standby state to the main state according to the switching signal.

Optionally, the Ambari high availability system further includes: at least one second slave node (slave);

The second slave node is used to send an access request to the central node;

The central node is further configured to obtain the access request sent by the second slave node; and when the master-standby state is the master state, respond to the access request and establish a link with the second slave node.

An embodiment of the present application provides an Ambari high-availability method, which can be applied to any form of electronic device, such as a terminal and a server. As shown in Figure 2, the high availability method of Ambari is applied to the distributed coordinator, and the distributed coordinator is linked with at least two central nodes. The active and standby status of the central node is the standby status. Among them, there are various types of distributed coordinators, such as, but not limited to, zookeeper or etcd.

Specifically, the method for high availability of Ambari includes:

Step 201 , after detecting that the current main center node is abnormal, delete the first device information written by the current main center node in the distributed coordinator.

In some embodiments, the current main central node is one of at least two central nodes, and the current main central node is the central node (master) that responded to the access request of the second slave node (slave) most recently. The active-standby state of the primary master is the primary state. During the normal use of the service, the current main center node uses the heartbeat mechanism to establish a link with the distributed coordinator. The abnormality of the current main center node may be the abnormal link between the current main center node and the distributed coordinator.

In an optional embodiment, the abnormality of the current main center node is detected, which may specifically include:

It is detected that the duration of the abnormal link with the current main central node exceeds the first preset duration.

By monitoring the link between the distributed coordinator and the current main center node, when the time period of the abnormal link between the two exceeds the first preset time period, it is determined that the current main center node is abnormal.

It should be noted that, after monitoring that the duration of the abnormal link between the current main central node and the distributed coordinator is greater than or equal to the second preset duration, the active and standby states of the current main central node are switched from the active state to the standby state. state. Wherein, the second preset duration is greater than the heartbeat period of the link between the distributed coordinator and the current main central node.

Further, in order to avoid the subsequent occurrence of two main central nodes, the first preset duration is set to be greater than the second preset duration. Therefore, after the current main center node is switched to the standby state (that is, all the center nodes are in the standby state), the first device information written by the current main center node is deleted, so that the center node in the standby state can be distributed to the distribution The coordinator writes its own second device information.

Wherein, the above-mentioned first device information and second device information may be, but not limited to, IP (Internet Protocol, Internet Protocol) of the central node.

Step 202: Send a writable signal to at least one central node, so that at least one central node writes its own second device information to the distributed coordinator according to the writable signal.

In some embodiments, after deleting the first device information, the distributed coordinator sends a writable signal to at least one central node, thereby notifying the central node in the standby state in the system that the device information can be written. After receiving the writable signal, the central node will write its own second device information into the distributed coordinator.

Wherein, it can be preset to write the device information to a node in the distributed coordinator, for example: /active/master. The device information written by the central node is written to this node.

It can be understood that, after the current main center node switches the active-standby state to the standby state, if it establishes a link with the distributed coordinator again, it can also write its own device information to the distributed coordinator.

Step 203: Determine the target central node to which the second device information is successfully written in at least one central node.

In some embodiments, since all central nodes in the system that are linked to the distributed coordinator will write their own device information, this application adopts a "first come, first served" mechanism, that is, priority to write their own device information. The central node is the main central node.

The distributed coordinator includes a master node and at least two first slave nodes, and in an optional embodiment, determining the target center node that successfully writes the second device information in the center node includes:

After the second device information of the central node is written into the master node, the master node synchronizes the second device information to the first slave node according to at least two first slave nodes in sequence; the number of the first synchronized first slave nodes is The central node that reaches the preset value is determined as the target central node that successfully writes the second device information.

In some embodiments, the central node first writes the second device information to the master node in the distributed coordinator, and the master node of the distributed coordinator synchronizes the second device information to the first slave node, because the first slave node has The master node synchronizes the second device information to the first slave node in turn. Among all the first slave nodes, the number of first slave nodes that synchronize the second device information of a certain central node reaches the preset value first, The central node is determined as the target central node.

Wherein, the preset value can be set according to the actual situation, for example, set to a value smaller than the total number of the first slave nodes. Preferably, it can be set to half of the total number but not limited to.

Preferably, in order to avoid the situation that the number of the second device information of the two central nodes in the first slave node reaches a preset value at the same time during the synchronization process, the total number of the first slave nodes is set to an odd number (2N+1 , N is a positive integer), the default value is set to N+1.

Step 204: Send a switching signal to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal.

In some embodiments, after the distributed coordinator determines the target central node, it will send a switching signal to the target central node, so that the target central node can switch the active-standby state from the standby state to the main state according to the switching signal, so as to restore the service. .

In the high availability method of Ambari of the present application, after the current main center node is abnormal, no manual participation is required, and after the abnormal link between the current main center node and the distributed coordinator reaches the second preset value, the current main center node The state is switched from the main state to the standby state, and after the abnormal link duration reaches the second preset value, the distributed coordinator deletes the first device information written by the current central node, and sends a writable to the central node in the system. Signal. After receiving the writable signal, each central node writes its own second device information to the distributed coordinator, and the distributed coordinator determines the target central node according to the written second device information, and sends the information to the target central node. Send a switch signal, and the target central node switches the active and standby states to the main state according to the switch signal, thereby restoring the service.

Another high availability method of Ambari is provided in an embodiment of the present application. For the specific implementation of the method, reference may be made to the description of the foregoing method embodiment section, and repeated details will not be repeated. The method can be applied to any form of electronic equipment, such as terminals and servers. As shown in Figure 3, the high availability method of Ambari, applied to the central node, includes:

Step 301: Acquire a writable signal sent by the distributed coordinator. The writable signal is sent by the distributed coordinator after deleting the first device information written by the current main center node in the target node of the distributed coordinator.

Step 302: Write the second device information of itself to the distributed coordinator according to the writable signal.

Step 303: Obtain the handover signal sent by the distributed coordinator.

Step 304: Switch the active/standby state from the standby state to the main state according to the switch signal.

In an optional embodiment, the Ambari high availability method further includes:

Acquire the access request sent by the second slave node; if the master-standby state is the master state, respond to the access request and establish a link with the second slave node.

In some embodiments, the second slave node is a slave node corresponding to the central node. Each second slave node slave is configured with addresses of all central node masters, and each second slave node slave is configured with multiple master addresses.

The slave accesses all configured masters according to the preset access policy. If the master responds to the request normally, the slave considers the master to be the master and continues to access the master in the future. If the master does not respond to the request normally, the slave continues to try to access other masters. Specifically, there are many situations in which the master does not respond to the request normally. For example, the master does not respond; for another example, the master responds, but the master reports that it is not the master.

Among them, the access policy can be accessed in sequence according to the order of the master, or it can be accessed in a random manner.

In a specific embodiment of this application, referring to FIG. 4 , after the master is started, its active/standby state is the standby state. When a certain master1 writes its own machine information on a certain node (/active/master) of zookeeper (that is, the above-mentioned device information), will be recognized as the main state, and switch the main state to the main state by itself. After the master1 master/slave state becomes the master state, it can respond to the slave request normally. The slave accesses all configured masters according to the random access policy. If the master responds to the request normally, the slave considers the master to be the master and continues to access the master in the future. Otherwise, you need to tell the slave that it is the standby center node and does not accept the request. After master1 is abnormal, and the duration of the link abnormality exceeds the second preset duration T2, it switches its master-standby state to the standby state. At this time, all masters are in standby state, so there will be no problem of multiple masters becoming masters. During this period, no master is available, and the service is temporarily unavailable, but it will be automatically restored within a short period of time.

The device information of the node written to zookeeper is temporary information. After the abnormal link duration exceeds the first preset duration T1 (T2<T1), the temporary information will be deleted by zookeeper. Other masters can try to write their own information to the node of zookeeper, and the master that successfully writes becomes the master.

Based on the same concept, an embodiment of the present application provides an Ambari high-availability device. For the specific implementation of the device, please refer to the description in the method embodiment section, and the repeated parts will not be repeated. As shown in FIG. 5 , the device mainly includes: :

The deletion module 501 is used to delete the first device information written in the distributed coordinator by the current main central node after monitoring the abnormality of the current main central node; the distributed coordinator is linked with at least two central nodes, and the current main central node The node is one of at least two central nodes;

a first sending module 502, configured to send a writable signal to at least one central node, so that at least one central node writes its own second device information to the distributed coordinator according to the writable signal;

A determination module 503, configured to determine, in at least one central node, the target central node to which the second device information is successfully written;

The second sending module 504 is configured to send a switching signal to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal.

Based on the same concept, an embodiment of the present application provides an Ambari high-availability device. For the specific implementation of the device, please refer to the description in the method embodiment section, and the repeated parts will not be repeated. As shown in FIG. 6 , the device mainly includes: :

The first obtaining module 601 is configured to obtain a writable signal sent by the distributed coordinator, where the writable signal is the first device written by the distributed coordinator in the target node of the distributed coordinator when deleting the current main center node. sent after the information; the distributed coordinator is linked with at least two central nodes, and the current main central node is one of the at least two central nodes;

a writing module 602, configured to write its own second device information to the distributed coordinator according to the writable signal;

A second acquiring module 603, configured to acquire the handover signal sent by the distributed coordinator;

The switching module 604 is configured to switch the active-standby state from the standby state to the main state according to the switching signal.

Based on the same concept, an embodiment of the present application also provides an electronic device. As shown in FIG. 7 , the electronic device mainly includes: a processor 701 , a memory 702 and a communication bus 703 , wherein the processor 701 and the memory 702 communicate with each other through communication The bus 703 performs communication with each other. The memory 702 stores a program that can be executed by the processor 701, and the processor 701 executes the program stored in the memory 702 to implement the following steps:

After monitoring the abnormality of the current main center node, delete the first device information written by the current main center node in the distributed coordinator, and the current main center node is one of at least two center nodes;

Sending a writable signal to at least one central node, so that at least one central node writes its own second device information to the distributed coordinator according to the writable signal;

Determine the target central node to which the second device information is successfully written in at least one central node;

A switching signal is sent to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal. or,

Obtain the writable signal sent by the distributed coordinator, and the writable signal is sent by the distributed coordinator after deleting the first device information written by the current main center node in the target node of the distributed coordinator;

According to the writable signal, write its own second device information to the distributed coordinator;

Obtain the switching signal sent by the distributed coordinator;

The active/standby state is switched from the standby state to the main state according to the switching signal.

The communication bus 703 mentioned in the above electronic device may be a Peripheral Component Interconnect (PCI for short) bus or an Extended Industry Standard Architecture (Extended Industry Standard Architecture, EISA for short) bus or the like. The communication bus 703 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is used in FIG. 7, but it does not mean that there is only one bus or one type of bus.

The memory 702 may include random access memory (Random Access Memory, RAM for short), or may include non-volatile memory (non-volatile memory), such as at least one disk storage. Optionally, the memory may also be at least one storage device located away from the aforementioned processor 701 .

The above-mentioned processor 701 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc., and may also be a digital signal processor (Digital Signal Processing, DSP for short) , Application Specific Integrated Circuit (ASIC for short), Field-Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gate or transistor logic devices, and discrete hardware components.

In yet another embodiment of the present application, a computer-readable storage medium is also provided, where a computer program is stored in the computer-readable storage medium, and when the computer program is run on a computer, the computer is made to execute the above-mentioned embodiments. Ambari's high-availability approach as described.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the procedures or functions according to the embodiments of the present application are generated in whole or in part. The computer may be a general purpose computer, special purpose computer, computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, from a website site, computer, server, or data center via wired (e.g., Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg infrared, microwave, etc.) means to transmit to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes one or more available mediums integrated. The available media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes, etc.), optical media (eg, DVDs), or semiconductor media (eg, solid state drives), and the like.

It should be noted that, in this document, relational terms such as "first" and "second" etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (13)

1. a high availability method of Ambari, is characterized in that, is applied to distributed coordinator, and described distributed coordinator is linked with at least two central nodes, and described method comprises: After detecting that the current main center node is abnormal, delete the first device information written by the current main center node in the distributed coordinator; the current main center node is one of the at least two center nodes; sending a writable signal to at least one of the central nodes, so that the at least one central node writes its own second device information to the distributed coordinator according to the writable signal; Determine the target central node that successfully writes the second device information in the at least one central node; A switching signal is sent to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal. 2. the high availability method of Ambari according to claim 1, is characterized in that, monitoring the abnormality of current main center node, comprises: It is detected that the duration of the abnormal link with the current main central node exceeds the first preset duration. 3. The high-availability method for Ambari according to claim 2, wherein the first preset duration is longer than a second preset duration, and the second preset duration is longer than the distributed coordinator and the The heartbeat period of the current main center node link. 4. The high-availability method for Ambari according to claim 1, wherein the distributed coordinator comprises a master node and at least two first slave nodes; in the determining of the at least one central node, a successful write The target central node for entering the second device information, including: After the second device information of the central node is written into the master node, the second device information is sequentially synchronized to the at least two first slave nodes through the master node; The first central node whose number of synchronized first slave nodes reaches a preset value is determined as the target central node that successfully writes the second device information. 5 . The high availability method of Ambari according to claim 4 , wherein the preset value is half of the total number of the first slave nodes. 6 . 6. A highly available method of Ambari, characterized in that, applied to a central node, comprising: Obtain a writable signal sent by the distributed coordinator, where the writable signal is the first device information written by the distributed coordinator in the target node of the distributed coordinator after the distributed coordinator deletes the current main center node sent; According to the writable signal, write its own second device information to the distributed coordinator; obtaining the handover signal sent by the distributed coordinator; The active/standby state is switched from the standby state to the main state according to the switch signal. 7. The high availability method of Ambari according to claim 6, is characterized in that, also comprises: Obtain the access request sent by the second slave node; If the active/standby state is the master state, respond to the access request and establish a link with the second slave node. 8. A high-availability system of Ambari, comprising: a distributed coordinator and at least two central nodes, the distributed coordinator is linked with at least two central nodes; The distributed coordinator is used to delete the first device information written by the current main center node in the target node of the distributed coordinator after monitoring that the current main center node is abnormal; The node sends a writable signal; the current main central node is one of the at least two central nodes; the central node, configured to send its own second device information to the distributed coordinator according to the writable signal; The distributed coordinator is further configured to determine, in the central node, the target central node to which the second device information is successfully written; The central node is further configured to switch the active-standby state from the standby state to the active state according to the switching signal. 9. The high availability system of Ambari according to claim 8, characterized in that, further comprising: at least one second slave node; the second slave node, configured to send an access request to the central node; The central node is further configured to obtain an access request sent by the second slave node; and when the master-standby state is the master state, respond to the access request and establish a link with the second slave node. 10. A high-availability device of Ambari, characterized in that, comprising: a deletion module, configured to delete the first device information written in the distributed coordinator by the current main central node after monitoring the abnormality of the current main central node; the distributed coordinator is linked with at least two central nodes, The current main central node is one of the at least two central nodes; a first sending module, configured to send a writable signal to at least one of the central nodes, so that the at least one central node writes its own second device information to the distributed coordinator according to the writable signal ; a determining module, configured to determine, in the at least one central node, the target central node to which the second device information is successfully written; The second sending module is configured to send a switching signal to the target central node, so that the target central node switches the active-standby state from the standby state to the main state according to the switching signal. 11. A high-availability device of Ambari, characterized in that, comprising: The first obtaining module is configured to obtain a writable signal sent by the distributed coordinator, where the writable signal is written by the distributed coordinator in the target node of the distributed coordinator when the current main center node is deleted. sent after the entered first device information; the distributed coordinator is linked with at least two central nodes, and the current main central node is one of the at least two central nodes; a writing module, configured to write its own second device information to the distributed coordinator according to the writable signal; a second acquiring module, configured to acquire the handover signal sent by the distributed coordinator; The switching module is configured to switch the active-standby state from the standby state to the main state according to the switching signal. 12. An electronic device, comprising: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus; the memory for storing computer programs; The processor is configured to execute the program stored in the memory to implement the high availability method of Ambari according to any one of claims 1-5 or 6-7. 13. A computer-readable storage medium storing a computer program, wherein when the computer program is executed by a processor, the high-availability method of Ambari according to any one of claims 1-5 or 6-7 is implemented.

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