Industrial solutions based on Cassandra are deployed at Cisco, IBM, Cloudkick, Reddit, Digg, Rackspace, Twitter and a host of other big data companies. For example, Expedia, a major U.S. travel company, stores billions of constantly updated prices from 140,000 hotels using Cassandra. Apple has more than 100,000 Cassandra nodes in production, which confirms the excellent scalability of this DBMS. Another data-driven organization, the international taxi company Uber uses Cassandra in several data centers to provide an information base for its rides.
Having analyzed the information on the use of Apache Cassandra in real Big Data projects, we identified 5 main areas of the practical application of this distributed DBMS:
In this case, according to SLA (Service Level Agreement), it is necessary to keep a very low average response delay (less than 5 milliseconds) and the maximum possible number of operations per second even at peak load. Cassandra's high read and write operation rates allowed the Spotify team to implement such a service.
Similarly, Apache Cassandra is used by Netflix and Expedia to store user viewing data and support the streaming API.
The data come in large volumes and at high speed, including information from special equipment (sensors and monitors). Such a distributed system requires a Hadoop environment with a non-relational DBMS to handle the document repository or key-value pairs. For real-time data streaming, it is reasonable to use Apache Storm, however, it does not support application stateful storage. So there is a need for an external persistent repository of information, a role that can also be performed by Apache Cassandra, along with storage and fast processing of medical data.
And thanks to its decentralized architecture with no single point of failure, Cassandra can guarantee the safety of information even if several nodes or an entire data center fail (assuming data is distributed across multiple data centers). This DBMS property is especially important in a critical industry such as medicine.
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