Slides: https://www.slideshare.net/DataStax/maintaining-consistency-across-data-centers-randy-fradin-blackrock-cassandra-summit-2016 | We use Apache Cassandra at BlackRock to help power our Aladdin investment management platform. Like most users, we love Cassandra’s scalability and fault tolerance. One challenge we’ve faced is keeping data consistent between data centers. Cassandra is great at replicating data to multiple data centers, and many users take advantage of this feature to achieve eventual consistency in multi-region clusters. At BlackRock, we have several use cases where eventual consistency is not good enough; sometimes we need to guarantee that the most recent data is available from all locations. Cassandra’s tunable consistency makes it possible to achieve this extreme level of resiliency. In this talk we’ll discuss our experience from the past several years using Cassandra for cross-WAN consistency, some of the novel ways we’ve dealt with the performance implications, and our ideas for improving support for this usage model in future versions of Cassandra. About the Speaker Randy Fradin Vice President, BlackRock Randy Fradin is part of BlackRock’s Aladdin Product Group. His team is responsible for developing the core software infrastructure in BlackRock’s Aladdin platform, including scalable storage, compute, and messaging services. Previously he spent time developing the market data, risk reporting, and core trading functions in Aladdin. He has been an enthusiastic Cassandra user since 2011.