Apple siri has evolved many times and each and every time it has managed to bounce back with solid capabilities, sky is the limit and we can only expect some or other kind of improvement in the architecture as the technology evolves. These guys have not given an inch to rivals. Apple Siri backend runs thousands of services and they are running on equal number of nodes. Siri’s Application data resides in HDFS (Hadoop distributed file system) cluster . Apple have created a proprietary PaaS-like scheduler framework named J.A.R.V.I.S. , which allows developers to deploy Siri services in a scalable and highly available manner. Apache Mesos is the one that Apple Siri is leveraging for backend cluster management, it serves the CPU, Memory and computing resources abstraction very well, to prove the capability, following is the data published by Apache Mesos Apache Mesos Features Scalability to 10,000s of nodes Fault-tolerant replicated master and slaves using ZooKeeper Support for
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