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What is Eureka?

Eureka is a REST (Representational State Transfer) based service that is primarily used in the AWS cloud for locating services for the purpose of load balancing and failover of middle-tier servers.

What is Serf?

Serf is a service discovery and orchestration tool that is decentralized, highly available, and fault tolerant. Serf runs on every major platform: Linux, Mac OS X, and Windows. It is extremely lightweight: it uses 5 to 10 MB of resident memory and primarily communicates using infrequent UDP messages.

What is Zookeeper?

A centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications.
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          What companies use Eureka?
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          What tools integrate with Eureka?
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            What are some alternatives to Eureka, Serf, and Zookeeper?
            Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable.
            etcd is a distributed key value store that provides a reliable way to store data across a cluster of machines. It’s open-source and available on GitHub. etcd gracefully handles master elections during network partitions and will tolerate machine failure, including the master.
            The main goal of this project is to provide simple and robust facilities for loadbalancing and high-availability to Linux system and Linux based infrastructures.
            SkyDNS is a distributed service for announcement and discovery of services. It leverages Raft for high-availability and consensus, and utilizes DNS queries to discover available services. This is done by leveraging SRV records in DNS, with special meaning given to subdomains, priorities and weights (more info here:
            Scaling a web infrastructure requires services, and building a service-oriented infrastructure is hard. Make it EASY, with SmartStack’s automated, transparent service discovery and registration: cruise control for your distributed infrastructure.
            See all alternatives
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            How developers use Eureka, Serf, and Zookeeper
            Avatar of Soundcloud
            Soundcloud uses ZookeeperZookeeper

            Initially, Stitch only supported real-time updates and addressed this problem with a MapReduce job named The Restorator that performed the following actions:

            • Calculated the expected totals
            • Queried Cassandra to get the values it had for each counter
            • Calculated the increments needed to apply to fix the counters
            • Applied the increments

            Meanwhile, to stop the sand shifting under its feet, The Restorator needed to coordinate a locking system between itself and the real-time processors, so that the processors did not try to simultaneously apply increments to the same counter, resulting in a race-condition. It used ZooKeeper for this.

            Avatar of Pinterest
            Pinterest uses ZookeeperZookeeper

            Like many large scale web sites, Pinterest’s infrastructure consists of servers that communicate with backend services composed of a number of individual servers for managing load and fault tolerance. Ideally, we’d like the configuration to reflect only the active hosts, so clients don’t need to deal with bad hosts as often. ZooKeeper provides a well known pattern to solve this problem.

            Avatar of Pinterest
            Pinterest uses ZookeeperZookeeper

            Zookeeper manages our state, and tells each node what version of code it should be running.

            Avatar of Ralic Lo
            Ralic Lo uses ZookeeperZookeeper

            Used Zookeeper as the resource management system for Mesos/Marathon services.

            Avatar of Nurul Ferdous
            Nurul Ferdous uses ZookeeperZookeeper

            Maintain a distributed cluster for search index

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