Method and device for listening data node

Abstract

The present application provides a method and a device for listening a data node. The method comprises the following steps of: using a listener to listen a target data node; sending a notification request to a client registering the listener if the listener listens that the target data node changes; and retaining the listener so as to continue to listen the target data node. The method and the device can retain the listener without deleting after the listening operation; therefore, the target data node can be repeatedly listened, and the situation that the change of the target data node is missed during from the deletion of the listener to the newly-building of the listener can be avoided, so that the problem that the change of the target data node is missed during from the deletion of thelistener to the newly-building of the listener is solved. The client only needs to send a registration request to a server once, and does not need to send the registration request to the server multiple times; therefore, the number of network interactions between the client and the server can be reduced, so that the network resource is saved and the listening mechanism operation is simplified.

Description

technical field [0001] The present application relates to the technical field of network communication, in particular to a data node monitoring method and device. Background technique [0002] As a distributed coordination service system, Zookeeper can provide open source distributed configuration, synchronization services, naming registration and other services for large-scale distributed computing. The ZooKeeper system includes a server and multiple clients, and the server includes multiple data nodes. [0003] In the monitoring mechanism supported by ZooKeeper, the client can register a listener (Watcher) with the server so that the server can monitor the target data node that the client is concerned about. If the server detects that the target data node has changed, it will trigger the listener to notify the client that registered the listener. [0004] However, since the ZooKeeper default listener will delete the listener after it is used once, the listener in ZooKeep...

AI Technical Summary

Problems solved by technology

[0005] If the client still wants to monitor the target data node, it needs to register the listener with the server again, which will increase the number of network interactions between the client and the server; and, if the original listener is deleted and before the new listener is built, If the target data node changes, the server cannot monitor the change, that is, the change of the target data node during this period will be missed

[0006] That is, the existing monitoring mechanism in ZooKeeper has a cumbersome operation process, takes up a lot of network resources, and has a certain omission rate

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