Druid: how to cache all historical node data in memory
问题 I have about 10GB of data stored on a historical node. However the memory consumption for that node is about 2GB. When I launch a select query, results are returned the first time in more than 30 secondes. Next, they are in second (because of brokers cache). My concern is to reduce the first time select on whatever query to one second. To achieve such performance, I think it is a good start if historical node store all the data in memory. Question: what are the configuration parameters in