Several common algorithms in distributed coordination services include:
1. Master selection algorithm
It is used to elect a node from multiple nodes as the master node or leader. Common algorithms include Bully algorithm, Ring algorithm, etc.
2. Atomic broadcast algorithm
It is used to broadcast messages to all nodes in the distributed system to ensure that all nodes can receive the messages. The typical two-phase commit protocol realizes atomic broadcast.
3. Consensus algorithm
It is used to ensure that the data state of each node in the distributed system can be kept consistent. For example, the Paxos algorithm can achieve high availability and strong consistency.
4. Membership Management Algorithm
It is responsible for maintaining the member status of the distributed system, and is used to dynamically monitor the joining and leaving of nodes. For example, the Gossip algorithm realizes the fan-out information dissemination.
5. Load balancing algorithm
Assign tasks and requests to backend nodes in a balanced manner. Commonly used algorithms include round robin, least connection, consistent hashing, etc.
6. Dynamic Configuration Protocol
Allow nodes in the cluster to update configuration information and notify other nodes to ensure consistent cluster configuration views.
7. Heartbeat detection algorithm
Detect node survival status by periodically exchanging keepalive or heartbeat messages, like the Hazelcast heartbeat mechanism.
8. Distributed lock algorithm
Control mutually exclusive access to shared resources to ensure that only one node can access locked resources at a time.