fault tolerance
CloudBees CD/RO
CloudBees CD/RO can be "clustered", or scaled horizontally, without downtime. Its unlimited clustering architecture provides fault tolerance for up to thousands of concurrent deployments and deploying software to multiple data centers. A CloudBees CD/RO clustered configuration requires these software components:
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Apache ZooKeeper is a centralized service for maintaining and synchronizing group services in a cluster.
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A load balancer for routing work to machines in the cluster.