Alibaba cloud Q & A 2022-02-13 06:01:31 阅读数:90
Zookeeper How are node outages handled ？
Zookeeper It's also a cluster , The recommended configuration is no less than 3 Servers .Zookeeper We also need to ensure that when a node goes down , Other nodes will continue to provide services .
If it's a Follower Downtime , also 2 Servers provide access , because Zookeeper There are multiple copies of the data on , Data is not lost ;
If it's a Leader Downtime ,Zookeeper New ones will be elected Leader.
ZK The mechanism of clustering is that as long as more than half of the nodes are normal , The cluster can provide services normally . Only in ZK Too many nodes , Only half or less of the nodes can work , Clusters fail .
3 Of nodes cluster You can hang up 1 Nodes (leader You can get 2 ticket >1.5)
2 Of nodes cluster You can't hang up on anything 1 There are nodes (leader You can get 1 ticket <=1)
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