springboot-curator-demo

Curator demo

Basic usage

See

usage_retryPolicies()     / usage_retryPoliciesAsync()
usage_configManagement()  / usage_watchers()
usage_typedModel()        / usage_leaderElection()
usage_sharedLock()        / usage_counter()  

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Shared lock demo

• Server side (receive tasks)
• Client side (push tasks)

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Master slave demo

• LeaderListener
• Leader Selector start & check

Running 3 applications

• Client001

$ java -Dlock.client.id=0001 -Dserver.port=8081 -Dspring.profiles.active=master-slave -jar demo.jar

• Client002

$ java -Dlock.client.id=0002 -Dserver.port=8082 -Dspring.profiles.active=master-slave -jar demo.jar

• Client003

$ java -Dlock.client.id=0003 -Dserver.port=8083 -Dspring.profiles.active=master-slave -jar demo.jar

=> If terminate a client having leadership, then another client will have leadership

2018-12-15 01:18:28.578  INFO 5275 --- [eaderSelector-0] demo.master.LeaderListener               : [0001] task leadership.... client : org.apache.curator.framework.imps.CuratorFrameworkImpl@79191bc4
2018-12-15 01:18:29.255  INFO 5275 --- [       Thread-2] [MASTER-SLAVE]                           : [Check leader - 0001] is leader : true

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