I see an issues when I run high traffic to the Cassandra nodes, the heap gets full to about 94% (which is expected) but the thing that confuses me is that the heap usage never goes down after the traffic is stopped (at-least, it appears to be so) . I kept the nodes up for a day after stopping the traffic and the logs still tell me
"Heap is 0.9430032942657169 full. You may need to reduce memtable and/or cache sizes. Cassandra will now flush up to the two largest memtables to free up memory. Adjust flush_largest_memtables_at threshold in cassandra.yaml if you don't want Cassandra to do this automatically" Things go back to normal when I restart Cassandra. nodetool netstats tells me the following: Mode: Normal Not sending streams and a bunch of keyspaces streaming from other nodes which are at 0% and this stays this way until I restart Cassandra. Also I see this at the bottom: Pool Name Active Pending Completed Commands n/a 0 8267930 Responses n/a 0 15184810 Any ideas as to how I can speed up this up and reclaim the heap ? Thanks !
