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This article will explain in detail how to implement the Master-Worker collaboration mechanism in zookeeper. The editor thinks it is very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Case study:

1. Using ZooKeeper to realize the cooperative management of a group member.

2. Create a node of Master and use Master to monitor group member Workers

3. Workers also needs to monitor Master. When Master goes down, a Worker can become Master.

Experimental background

1. ZooKeeper cluster, using the environment built in the previous article.

2. Start 3 clients, connect to the ZooKeeper cluster, and simulate Master and Worker.

Steps

1. The first client creates a temporary node master with its own port number to indicate that it is Master

Create-e / master 'master:2222'

2. Create a non-temporary node directory workers, which is used to store worker nodes. It must be a non-temporary node, and temporary nodes cannot have children.

3. The master node should monitor the workers node.

4. The second client, which also attempts to create a master, will fail.

5. The second client, create Worker node W1, become Worker, and listen for Master

6. The third client, which similarly creates w2, also listens to Master

7. There are already 2 worker nodes in the workers directory.

8. When the Master goes down (here the quit command is used to simulate the downtime), the worker can be notified, and one of them can delete its own worker node to create a master node and become a master.

Note: the above master listens to all worker nodes in the workers directory, please use the command

Ls2 / workers-w

During the stat test, it was found that master could not be notified when the nodes in the workers directory changed.

This is the end of this article on "how to implement Master-Worker collaboration mechanism in zookeeper". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it out for more people to see.

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