This article explains the Bully election algorithm used by Elasticsearch versions prior to 7.x, describes phenomena such as false death and split‑brain, and provides a detailed walkthrough of the master‑election source code including key Java methods and configuration parameters.
This article explains when Elasticsearch triggers a master election, describes each election stage—including active master and candidate selection, Bully algorithm comparison, and master node responsibilities—while providing code excerpts that illustrate the underlying implementation details.
This article explains ZooKeeper’s architecture, key concepts such as roles, sessions, ZNodes, versioning, ACLs, and watchers, and demonstrates how it powers essential big‑data components like Hadoop’s ResourceManager and HBase’s master election, naming service, and distributed locking.
The article explains how WMB, a high‑performance distributed message queue, uses Paxos‑based master election, periodic lease renewal, and a multi‑stage load‑balancing strategy to evenly distribute master nodes across groups, improve throughput, and ensure consistent message delivery.
This article explains how Openflowplugin uses Cluster Singleton services to elect a master controller for each switch, details the ContextChain registration and instantiation process, and describes how the MastershipChangeServiceManager and ReconciliationFramework enable north‑bound applications to detect and react to mastership changes.
This article introduces ZooKeeper’s fundamental architecture, explains its key concepts such as cluster roles, sessions, ZNodes, watches, and ACLs, and then details how it powers essential distributed coordination tasks—including configuration management, naming services, master election, and distributed locks—in large‑scale Hadoop and HBase ecosystems.
This article explains the concept of a Master role in distributed systems, how Master election relies on strong consistency via Paxos, details a lease‑based election algorithm, and discusses correctness guarantees and renewal mechanisms using versioning.
