Zookeeper
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ZooKeeper is a centralized coordination service for distributed applications. It allows distributed processes to synchronize with each other using shared znodes. ZooKeeper uses a leader election algorithm and quorum consensus to ensure high availability. It provides recipes for common distributed coordination problems like queues, locks, and leader election. ZooKeeper's internals use the ZAB protocol for consensus between leader and followers through epochs and proposals.
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![Queue
Put an item
1. Create a /znode /queue-A/item- with sequential flag
Pop an item
1. Get children [n,n+1,…] of /znode /queue-A
2. Delete /znode /queue-A/item-n](https://image.slidesharecdn.com/zookeeper-170316163639/85/Zookeeper-12-320.jpg)
![Lock
Acquire a lock
1. Create a /znode /lock/resource-m with ephemeral/sequential flag
2. Get children [n,n+1,…] of /znode /lock-
3. If /znode /lock-n is created in step 1, lock is acquired. Exit.
4. Watch /znode /lock-n (/znode /lock-(m-1)). When /znode /lock-n
deleted, go to step 2.
Release a lock
1. Delete the znode created in step 1.](https://image.slidesharecdn.com/zookeeper-170316163639/85/Zookeeper-13-320.jpg)
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- 2. Outline • Introduction • Installation/Administering • Recipes • ZooKeeper internals
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- 4. Data model • Znodes Persistent / Ephemeral Sequential /app2/gd-0000000001
- 6. Watch • Client registers watch in read operations • Watches triggered by write operations • One-time trigger
- 7. Outline • Introduction • Installation/Administering • Recipes • ZooKeeper internals
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- 10. Administering • bin/zkCli.sh -server 127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183 help ls / create /test data get /test set /test junk delete /test
- 11. Outline • Introduction • Installation/Administering • Recipes • ZooKeeper internals
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