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Advice on etcd, Eureka, and Zookeeper
Andrew Buschbacher
Andrew Buschbacher
Needs advice

Breaking a monolith into microservices and handling the scaling and health of new services as they come only. This should ideally help to reduce the overhead needed to get a service online. We have all of this being handled by custom URLs and health checks being done at the expense of infrastructure setup time and maintenance (VM sprawl). Initially, I am looking at Consul for the TLS proxy and security options as well as the KV store which may prove useful in cross datacenter environments.

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What is etcd?

etcd is a distributed key value store that provides a reliable way to store data across a cluster of machines. It鈥檚 open-source and available on GitHub. etcd gracefully handles master elections during network partitions and will tolerate machine failure, including the master.

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 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.
Why do developers choose etcd?
Why do developers choose Eureka?
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        What companies use etcd?
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        What are some alternatives to etcd, Eureka, and Zookeeper?
        Consul is a tool for service discovery and configuration. Consul is distributed, highly available, and extremely scalable.
        Redis is an open source, BSD licensed, advanced key-value store. It is often referred to as a data structure server since keys can contain strings, hashes, lists, sets and sorted sets.
        MongoDB stores data in JSON-like documents that can vary in structure, offering a dynamic, flexible schema. MongoDB was also designed for high availability and scalability, with built-in replication and auto-sharding.
        Partitioning means that Cassandra can distribute your data across multiple machines in an application-transparent matter. Cassandra will automatically repartition as machines are added and removed from the cluster. Row store means that like relational databases, Cassandra organizes data by rows and columns. The Cassandra Query Language (CQL) is a close relative of SQL.
        Vault is a tool for securely accessing secrets. A secret is anything that you want to tightly control access to, such as API keys, passwords, certificates, and more. Vault provides a unified interface to any secret, while providing tight access control and recording a detailed audit log.
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        Reviews of etcd, Eureka, and Zookeeper
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        How developers use etcd, Eureka, 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鈥檚 infrastructure consists of servers that communicate with backend services composed of a number of individual servers for managing load and fault tolerance. Ideally, we鈥檇 like the configuration to reflect only the active hosts, so clients don鈥檛 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 theskyinflames
        theskyinflames uses etcdetcd

        Set envrionment variables for Docker containers's apps.

        Avatar of Giant Swarm
        Giant Swarm uses etcdetcd

        etcd is a core component of our microservice platform.

        Avatar of Nurul Ferdous
        Nurul Ferdous uses ZookeeperZookeeper

        Maintain a distributed cluster for search index

        Avatar of Robert Hao
        Robert Hao uses etcdetcd

        I used etcd as high availability KV storage.

        How much does etcd cost?
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        How much does Zookeeper cost?
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