Please excuse if I have missed something and this is a basic question.
We are using local caching on our broker and we are trying to figure out how it affects our performance.
I have a couple of questions on this.
In memcached, you can set the expiration time, but there is no such option in the local cache.
What is the expiration time for the local cache? Also, if the data for the queried interval changes, does Druid automatically update the cache on ingestion time, so that we get up-to-date results?
For example if we are doing a query for the past 5 minutes, while data is coming in, and we have the cache enabled on the broker, will we get up-to-date results, or will we get the results of the first time the cache was populated?