incubator-cassandra-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Radim Kolar <>
Subject Re: Read TPS in 0.8.6
Date Fri, 23 Dec 2011 16:52:47 GMT
cassandra read performance depends on your disk cache (free memory at 
node not used by cassandra) and disk IOPS peformance. In ideal case (no 
need to merge sstables) cassandra needs 2 IOPS per data read if 
cassandra key/row caches are not used.

Standard hard drive has about 150 IOPS. If you have one hard drive per 
machine, 50 reads per second on ~ 10 GB CFs with random key access is 
about fine.

dont trust stress tool too much, it is way different from real world 
workloads. In real world you will have hotspots and these will get cached.

View raw message