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.



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