In the previous post, we discovered the potential for data loss in RabbitMQ clusters. In this oft-requested installation of the Jepsen series, we’ll look at etcd: a new contender in the CP coordination service arena. We’ll also discuss Consul’s findings with Jepsen. Like Zookeeper, etcd is designed to store small amounts of strongly-consistent state for coordination between services. It exposes a
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»Consul vs. ZooKeeper, doozerd, etcdZooKeeper, doozerd, and etcd are all similar in their architecture. All three have server nodes that require a quorum of nodes to operate (usually a simple majority). They are strongly-consistent and expose various primitives that can be used through client libraries within applications to build complex distributed systems. Consul also uses server nodes within a
The more services we have, the bigger the chance for a conflict to occur if we are using predefined ports. After all, there can be no two services listening on the same port. Managing a tight list of all the ports used by, lets say, hundred services is a challenge in itself. Add to that list the databases those services need and the number grows even more. For that reason we should deploy services
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