By reading 90 partitions concurrently(each having size > 200 MB), My single node Apache Cassandra became unresponsive,
no read and write works for almost 10 minutes. I'm using this configs: memtable_allocation_type: offheap_buffers gc: G1GC heap: 128GB concurrent_reads: 128 (having more than 12 disk) There is not much pressure on my resources except for the memory that the eden with 70GB is filled and reallocated in less than a minute. Cpu is about 20% while read is crashed and iostat shows no significant load on disk. Sent using Zoho Mail