ZNodes in Zookeeper | System Design | High Level Design
Welcome to a concise guide on ZNodes in Apache ZooKeeper! Join me as I explore the role of ZNodes in managing data and coordination within distributed systems.
What are ZNodes?
ZNodes are the fundamental data units in Apache ZooKeeper, forming a hierarchical tree structure similar to a file system's directories and files. Each ZNode can store data and have child ZNodes, making it an essential component for organizing and managing distributed system data.
Types of ZNodes
1. Persistent ZNodes:
These ZNodes remain in ZooKeeper's storage until explicitly deleted by a client.
Used for storing configuration data, state information, and other persistent data that needs to survive across sessions.
2. Ephemeral ZNodes:
These ZNodes are temporary and are automatically deleted when the client that created them disconnects from ZooKeeper.
Commonly used for tasks like leader election and distributed locks, where the ZNode should only exist while the client is active.
3. Sequential ZNodes:
A special type of ZNode that appends a unique, incrementing number to its name upon creation.
Used in scenarios like creating ordered nodes for leader election or generating unique identifiers.
In a distributed application, ZooKeeper is used to manage distributed locks. When a client needs a lock, it creates an ephemeral ZNode to represent the lock. As long as the client holds the lock, the ZNode exists. If the client disconnects or releases the lock, the ZNode is automatically deleted, allowing other clients to acquire the lock.
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