Open-sourcing a 10x reduction in Apache Cassandra tail latency
I'm not an expert on these things, but it seems to me if you're implementing a database in Java you wouldn't want to keep your data on the JVM Heap, as this seems to indicate. My understanding is that in most applications (like servers) the average object lives for a very short period of time, and most GC implementations are built from that idea. But, in a database, especially an in-memory database, the majority of the objects are going to live for a very long time. That makes the mark phase of GC a lot more expensive, puts more pressure on the generations, etc.Is my guess here correct, or are there things I'm missing or mistaken on?