why broker memory free look so odd?

Hi all:

Now we are pressuring our druid system, we found a appearance that is so odd, when we simulated high concurrency continuously, the query’s Requests per second is decreasing, but when we reload broker, it can pick up quickly, see the memory free monitor we get the pic like this:

we can see the memory free is decreasing and wave crest will occur when we reload broker.

If anyone meet this situation? Hope to get your answer.

Thanks,

Haoxiang

Can you run a profiler to see what is taking up the memory? One possibility of the memory spike when a broker restarts is that is has to reload info from Zookeeper about the state of the cluster.