CN109218137B - Method and device for detecting state of node in distributed system - Google Patents
Method and device for detecting state of node in distributed system Download PDFInfo
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- 238000009825 accumulation Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
Abstract
The application discloses a method and a device for detecting the state of a node in a distributed system. The method comprises the following steps: step one, a first node in a distributed system is adopted to send a call request to a health state interface of a second node with the opposite subordination relation to the first node; step two, judging whether the first node receives the health state information of the second node within the overtime time; step three, if the health state information of the second node is not received in the overtime, whether the number of times of sending the call request to the second node reaches the threshold value of the request number is judged: if the number of times of sending the call request by the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the step one; and if the number of times that the second node sends the call request reaches the threshold value of the request number, determining that the communication link between the first node and the second node is disconnected. The method enables the state of the nodes in the distributed system to be detected more accurately.
Description
Technical Field
The present application relates to the field of distributed systems, and in particular, to a method and an apparatus for detecting a state of a node in a distributed system.
Background
With the bottleneck encountered by moore's law, a system with a distributed architecture (referred to as a "distributed system" for short) is required to realize mass data processing capability and extensible computing capability. In a distributed system, the state of each service node is of great importance, if the master node cannot accurately judge the state of the slave node, the resources of the nodes cannot be coordinated, and if each slave node cannot judge the state of the master node, the master node cannot be elected again, so that data inconsistency is caused, and if the data inconsistency is caused, the system cannot run. If the status of the node is detected by sending a ping command, when the network load is high (for example, when a temporary network failure or delay occurs), all the time of the heartbeat transmission and reception process may be greater than the timeout time, and when the network load is small, all the time of the heartbeat transmission and reception process may be less than the timeout time, so that in fact, for different scenarios of network load, the criterion for determining the status of the node is inconsistent, which may cause a misjudgment of the status of the serving node.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a method and an apparatus for detecting a state of a node in a distributed system, which can more accurately determine a state of a service node in the distributed system.
In order to achieve the object of the present invention, an embodiment of the present invention provides a method for detecting a state of a node in a distributed system, where the method includes the following steps:
step one, a first node in a distributed system is adopted to send a call request to a health state interface of a second node with the opposite subordination relation to the first node; the distributed system comprises a plurality of service nodes, wherein a first node is a main node in the plurality of service nodes or a slave node in the plurality of service nodes and has an inverse subordination relation with the main node;
step two, judging whether the first node receives the health state information of the second node within the overtime time;
step three, if the health state information of the second node is not received in the overtime, whether the number of times of sending the call request to the second node reaches the threshold value of the request number is judged:
if the number of times of sending the call request by the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the step one;
and if the number of times that the second node sends the call request reaches the threshold value of the request number, determining that the communication link between the first node and the second node is disconnected.
Further, in an optional embodiment, after the step of determining that the communication link between the first node and the second node has been disconnected, the method further comprises:
if the first node is a master node and the second node is a slave node, then resources between the second node and other slave nodes of the first node are reallocated.
Further, in an optional embodiment, after the step of determining that the communication link between the first node and the second node has been disconnected, the method further comprises:
if the first node is a slave node and the second node is a master node, inquiring whether to determine that the communication links of other slave nodes of the second node and the second node are disconnected: and if the communication link between other slave nodes of the second node and the second node is determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
Further, in an optional embodiment, before step one, the method further comprises: and when detecting that a fourth node is added to the distributed system, setting a health state interface of the fourth node, wherein the health state interface of the fourth node is used for receiving a call request of a service node in the distributed system, and the affiliation of the service node is opposite to that of the fourth node.
Further, in an optional embodiment, before step one, the method further comprises: a time-out time and a threshold for the number of requests are set.
On the other hand, the embodiment of the invention provides a state detection device of a node in a distributed system, which comprises a request sending module, a state judgment module, a frequency accumulation module and a state determination module; wherein the content of the first and second substances,
the request sending module is used for: sending a call request to a health state interface of a second node with an inverse relationship with the first node by adopting the first node in the distributed system; the distributed system comprises a plurality of service nodes, wherein a first node is a main node in the plurality of service nodes or a slave node in the plurality of service nodes and has an inverse subordination relation with the main node;
the state judgment module is used for: judging whether the first node receives the health state information of the second node within the overtime time;
the frequency judging module is used for: if the health state information of the second node is not received within the overtime, whether the number of times of sending the call request to the second node reaches the threshold value of the request number of times is judged;
the number accumulation module is used for: if the number of times of sending the call request by the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the step one;
the state determination module is to: and if the number of times that the second node sends the call request reaches the threshold value of the request number, determining that the communication link between the first node and the second node is disconnected.
Further, in an optional embodiment, the apparatus further comprises a slave node processing module;
the slave node processing module is configured to: after the status determination module determines that the communication link between the first node and the second node has been disconnected, if the first node is a master node and the second node is a slave node, then resources between the second node and other slave nodes of the first node are reallocated.
Further, in an optional embodiment, the apparatus further comprises a master node processing module;
the main node processing module is used for: after the status determination module determines that the communication link between the first node and the second node has been disconnected, if the first node is a slave node and the second node is a master node, inquiring whether to determine that the communication links of other slave nodes of the second node and the second node have been disconnected: and if the communication link between other slave nodes of the second node and the second node is determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
Further, in an optional embodiment, the apparatus further comprises: newly adding a node processing module;
the newly added node processing module is used for: before the request sending module sends the call request by adopting the first node, when detecting that a fourth node is added to the distributed system, setting a health state interface of the fourth node, wherein the health state interface of the fourth node is used for receiving the call request of a service node in the distributed system, and the membership of the service node is opposite to that of the fourth node.
Further, in an optional embodiment, the apparatus further comprises a time and request number setting module;
the time and request number setting module is used for: before the request sending module sends the call request by adopting the first node, the timeout time and the threshold value of the request times are set.
The embodiment of the invention has the advantages that the scheme compares the time for receiving the health state information with the overtime time and compares the request times for sending the call request with the threshold value of the request times, so that the problem that the health state of the node is misjudged due to inconsistent standards for judging the state of the node caused by the change of network load can be avoided, temporary network faults and delay can be coped with, and the accuracy for detecting the state of the node in the distributed system is higher.
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 of a method for detecting a state of a node in a distributed system according to an embodiment of the present invention;
fig. 2 is a block diagram of a device for detecting a state of a node in a distributed system 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.
With the bottleneck encountered by moore's law, a system with a distributed architecture (referred to as a "distributed system" for short) is required to realize mass data processing capability and extensible computing capability. The distributed system includes a plurality of service nodes including a master node and slave nodes of the master node. If the status of the node is detected by sending the ping command, when the network load is high, all times of the heartbeat sending and receiving process may be greater than the timeout time, and when the network load is low, all times of the heartbeat sending and receiving process may be less than the timeout time, so that in fact, for scenes with different network loads, the criteria for determining the status of the node are inconsistent, which may cause misjudgment of the status of the node.
In view of the foregoing problems, in one aspect, an embodiment of the present invention provides a method for detecting a state of a node in a distributed system, as shown in fig. 1, where the method includes steps S101 to S109.
Step S101, a first node in a distributed system is adopted to send a call request to a health state interface of a second node with the opposite subordination relation with the first node; the distributed system comprises a plurality of service nodes, and the first node is a main node among the plurality of service nodes or a slave node with the opposite affiliation of the main node among the plurality of service nodes.
The master node is a leader node selected in the election program and has the right to allocate and schedule resources and tasks, and the slave nodes are ordinary nodes and generally receive the resources and tasks allocated by the master node. In the method provided in the embodiment of the present invention, the first node and the second node are both service nodes of the distributed system, and the affiliation between the first node and the second node is opposite, that is, if the first node is a master node, the second node is a slave node of the first node; if the second node is a master node, the first node is a slave node of the second node. Before step S101, a health status interface is set in advance for each service node of the distributed system, where each health status interface is used to receive a call request for health status information of a service node to which the health status interface is directed. And in step S101, the first node may send a call request to the health status interface of the second node to call the health status information of the second node, and determine the health status of the second node according to whether the health status information of the second node can be acquired within the timeout period. Also, the health status information of the second node mentioned herein may be a heartbeat signal of the second node.
Step S103, determining whether the first node receives the health status information of the second node within the timeout period.
In step S103, the above-described determination process is performed in order to determine the health state of the second node. If the health state information of the second node is received within the overtime, the communication link between the first node and the second node is judged to be normal, the health state of the second node is normal, and if the first node is a master node and the second node is a slave node of the first node, the first node can allocate resources and tasks to the second node; if the first node is a slave node and the second node is a master node of the first node, the first node may receive resources and tasks allocated by the second node.
Step S105, if the health state information of the second node is not received within the timeout period, whether the number of times of sending the call request to the second node reaches the threshold of the request number is judged.
In step S105, if the health status information of the second node is not received within the timeout period, the method does not immediately determine that the link between the second node and the first node is disconnected, but first determines whether the number of times of sending the invocation request to the second node reaches the threshold of the request number of times, so as to avoid the situation that the second node is mistakenly determined to be disconnected from the first node due to the fact that all the time of the process of sending and receiving the health status information of the invocation request may be greater than the timeout period when the network load is high.
Step S107, if the number of times of sending the call request by the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to step S101.
In step S107, for the case that the number of times that the second node sends the invocation request does not reach the threshold of the number of times of requests, the method first adds one to the number of times of invocation requests, and then still returns to step S101 to send the invocation request to the second node again by using the first node, so as to determine again whether the link between the first node and the second node has been disconnected.
Step S109, if the threshold of the request times is reached, it is determined that the communication link between the first node and the second node has been disconnected.
In step S107, for the case that the number of times that the second node sends the invocation request has reached the threshold of the request number, at this time, the first node has sent the invocation request to the second node several times in a period of time without receiving the health status information of the second node, and therefore it can be considered that the communication link between the first node and the second node has been indeed disconnected.
The embodiment of the invention has the advantages that the scheme compares the time for receiving the health state information with the overtime time and compares the request times for sending the call request with the threshold value of the request times, so that the problem that the health state of the node is misjudged due to inconsistent standards for judging the state of the node caused by the change of network load can be avoided, temporary network faults and delay can be coped with, and the accuracy for detecting the state of the node in the distributed system is higher.
Further, in an optional embodiment, after step S109, the method further includes:
if the first node is a master node and the second node is a slave node, then resources between the second node and other slave nodes of the first node are reallocated.
Further, in an optional embodiment, after step S109, the method further includes:
if the first node is a slave node and the second node is a master node, inquiring whether to determine that the communication links of other slave nodes of the second node and the second node are disconnected: and if the communication link between other slave nodes of the second node and the second node is determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
Further, in an optional embodiment, before step S101, the method further includes: and when detecting that a fourth node is added to the distributed system, setting a health state interface of the fourth node, wherein the health state interface of the fourth node is used for receiving a call request of a service node in the distributed system, and the affiliation of the service node is opposite to that of the fourth node.
Further, in an optional embodiment, before step S101, the method further includes: a time-out time and a threshold for the number of requests are set.
The time-out time and the threshold of the number of requests may be set for the entire distributed system, or may be set individually for each service node in the distributed system.
On the other hand, an embodiment of the present invention provides a device for detecting a state of a node in a distributed system, as shown in fig. 2, the device includes a request sending module 201, a state determining module 203, a number determining module 205, a number accumulating module 207, and a state determining module 209.
The request sending module 201 is configured to: sending a call request to a health state interface of a second node with an inverse relationship with the first node by adopting the first node in the distributed system; the distributed system comprises a plurality of service nodes, and the first node is a main node among the plurality of service nodes or a slave node with the opposite affiliation of the main node among the plurality of service nodes.
The state judgment module 203 is configured to: and judging whether the first node receives the health state information of the second node within the overtime time.
The number judgment module 205 is configured to: and if the health state information of the second node is not received within the overtime, judging whether the number of times of sending the call request to the second node reaches the threshold value of the request number of times.
The number accumulation module 207 is configured to: and if the number of times of sending the call requests by the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the step one.
The state determination module 209 is configured to: and if the number of times that the second node sends the call request reaches the threshold value of the request number, determining that the communication link between the first node and the second node is disconnected.
The embodiment of the invention has the advantages that the scheme compares the time for receiving the health state information with the overtime time and compares the request times for sending the call request with the threshold value of the request times, so that the problem that the health state of the node is misjudged due to inconsistent standards for judging the state of the node caused by the change of network load can be avoided, temporary network faults and delay can be coped with, and the accuracy for detecting the state of the node in the distributed system is higher.
Further, in an optional embodiment, the apparatus further comprises a slave node processing module.
The slave node processing module is configured to: after the status determination module 209 determines that the communication link between the first node and the second node has been disconnected, if the first node is a master node and the second node is a slave node, the resources between the second node and other slave nodes of the first node are reallocated.
Further, in an optional embodiment, the apparatus further comprises a master node processing module.
The main node processing module is used for: after the status determining module 209 determines that the communication link between the first node and the second node has been disconnected, if the first node is a slave node and the second node is a master node, then it is queried whether it is determined that the communication links between other slave nodes of the second node and the second node have been disconnected: and if the communication link between other slave nodes of the second node and the second node is determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
Further, in an optional embodiment, the apparatus further comprises: and newly adding a node processing module.
The newly added node processing module is used for: before the request sending module 201 sends the invocation request by using the first node, when it is detected that a fourth node is added to the distributed system, a health state interface of the fourth node is set, and the health state interface of the fourth node is used for receiving the invocation request of a service node in the distributed system, which has an inverse dependency relationship with the fourth node.
Further, in an optional embodiment, the apparatus further comprises a time and request number setting module.
The time and request number setting module is used for: before the request sending module 201 sends the call request by using the first node, the timeout time and the threshold of the number of requests are set.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A method for detecting the status of a node in a distributed system, the method comprising the steps of:
step one, a first node in a distributed system is adopted to send a call request to a health state interface of a second node with the opposite subordination relation to the first node; wherein the distributed system includes a plurality of service nodes, the first node being a slave node among the plurality of service nodes having an inverse relationship of affiliation with the master node;
step two, judging whether the first node receives the health state information of the second node within overtime time;
step three, if the health state information of the second node is not received in the overtime, judging whether the number of times of sending the call request to the second node reaches the threshold of the request number of times:
if the number of times of sending the call request to the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the first step;
if the number of times of sending the call request to the second node reaches the threshold of the request number, determining that the communication link between the first node and the second node is disconnected;
after the step of determining that the communication link between the first node and the second node has been broken, the method further comprises:
inquiring whether to determine that other slave nodes of the second node and the communication link of the second node are disconnected: and if the communication links of other slave nodes of the second node and the second node are determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
2. The method of claim 1, wherein prior to step one, the method further comprises: when detecting that a fourth node is added to the distributed system, setting a health state interface of the fourth node, wherein the health state interface of the fourth node is used for receiving a call request of a service node in the distributed system, which is opposite to the affiliation of the fourth node.
3. The method of claim 1, wherein prior to step one, the method further comprises: setting the timeout time and the threshold of the request times.
4. A state detection device of a node in a distributed system is characterized by comprising a request sending module, a state judging module, a frequency accumulating module, a state determining module and a main node processing module; wherein the content of the first and second substances,
the request sending module is used for: sending a call request to a health state interface of a second node with an opposite dependency relationship with a first node by adopting the first node in a distributed system; wherein the distributed system includes a plurality of service nodes, the first node being a slave node among the plurality of service nodes having an inverse relationship of affiliation with the master node;
the state judgment module is used for: judging whether the first node receives the health state information of the second node within the overtime time;
the frequency judging module is used for: if the health state information of the second node is not received within the overtime, judging whether the number of times of sending the call request to the second node reaches the threshold of the request number of times;
the number accumulation module is used for: if the number of times of sending the call request to the second node does not reach the threshold value of the request number, adding one to the request number, and then returning to the first step;
the state determination module is to: if the number of times of sending the call request to the second node reaches the threshold of the request number, determining that the communication link between the first node and the second node is disconnected;
the main node processing module is used for: after the status determination module determines that the communication link between the first node and the second node is disconnected, inquiring whether to determine that the communication links between other slave nodes of the second node and the second node are disconnected: and if the communication links of other slave nodes of the second node and the second node are determined to be disconnected, selecting a third node as a master node in all the slave nodes of the second node except the third node from all the slave nodes of the second node.
5. The apparatus of claim 4, further comprising: newly adding a node processing module;
the newly added node processing module is used for: before the request sending module sends a call request by using the first node, when detecting that a fourth node is added to the distributed system, setting a health state interface of the fourth node, wherein the health state interface of the fourth node is used for receiving the call request of a service node in the distributed system, and the affiliation of the service node is opposite to that of the fourth node.
6. The apparatus of claim 4, further comprising a time and request number setting module;
the time and request number setting module is used for: and before the request sending module sends a call request by adopting the first node, setting the timeout time and the threshold of the request times.
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