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The "ArchitectureOverview" page has been changed by StuHood. The comment on this change is: Without an explanation for where the numbers came from, this blurb is useless.. http://wiki.apache.org/cassandra/ArchitectureOverview?action=diff&rev1=8&rev2=9 -------------------------------------------------- You get consistency if R + W > N, where R is the number of records to read, W is the number of records to write, and N is the replication factor. A ConsistencyLevel of ONE means R or W is 1. A ConsistencyLevel of QUORUM means R or W is ceiling((N+1)/2). A ConsistencyLevel of ALL means R or W is N. So if you want to write with a ConsistencyLevel of ONE and then get the same data when you read, you need to read with ConsistencyLevel ALL. - Cassandra vs MySQL with 50GB of data - - - || MySQL || Cassandra || - ||~300ms write || ~0.12ms write|| - ||~350ms read || ~15ms read || -
