Are there any known performance issues if cassandra cluster launched with RackAwareStrategy because I see huge performance difference between RackAwareStrategy vs RackUnAwareStrategy. Here are details:
we have a cluster setup with 4 EC2 X large nodes, 3 of them are running in East region and 4th one is running in West region and they all communicate with each other through VPN tunnel interface which is only way we found to achieve ring architecture across Amazon cloud regions: we are able to process 3.5K write operations per second when we used RackUnAwareStrategy whereas :/home/ubuntu/cassandra/contrib/py_stress# ./stress.py -o insert -n 80000 -y regular -d ec2-xxx-xxx-xxx-xx.compute-1.amazonaws.com --threads 100 --keep-going total,interval_op_rate,avg_latency,elapsed_time 35935,3593,0.0289930914479,10 70531,3459,0.0289145907593,20 80000,946,0.0267288666213,30 whereas we are able to process only 250 write operations per second when we used RackAwareStrategy :/home/ubuntu/cassandra/contrib/py_stress# ./stress.py -o insert -n 80000 -y regular -d ec2-xxx-xxx-xxx-xx.compute-1.amazonaws.com --threads 100 --keep-going total,interval_op_rate,avg_latency,elapsed_time 2327,232,0.434396038355,10 4772,244,0.40946514036,20 7383,261,0.384504625415,30 9924,254,0.392919449861,40 12525,260,0.383832110482,50 15158,263,0.378838069983,60 17784,262,0.383219807364,70 20416,263,0.381646275973,80 23030,261,0.382550528602,90 25644,261,0.384442176815,100 28268,262,0.380935921084,110 30910,264,0.377376309224,120 33541,263,0.385158945698,130 36119,257,0.387976026517,140 38735,261,0.382333525368,150 41342,260,0.38413751514,160 43925,258,0.387684800391,170 46642,271,0.36899637237,180 49291,264,0.378489510164,190 51931,264,0.3793784538,200 54573,264,0.378474057217,210 57253,268,0.374258003573,220 59884,263,0.380020038658,230 62484,260,0.387267011954,240 64728,224,0.439328571054,250 67340,261,0.389221810455,260 69920,258,0.386144905127,270 72531,261,0.384242234948,280 75202,267,0.372129596605,290 77843,264,0.354621512291,300 80000,215,0.183918378283,310 Thanks in advance Niru