“…Distributed databases such as MongoDB [1], Couchbase Server [32], or Apache Cassandra [2] have become the new standard for data storage in cloud applications. Internet companies use them to power large-scale services such as search engines [34,39], social networks [2, 3, 23,24,31,69], online shopping [1,41], media services [4], messaging [28], financial services [5,33], graph analytics [6], and blockchain [7,45,56].…”