east: A B C west: D
Perhaps you are blocking on a write to D - what's your quorum/rf set up as? Bill On Fri, 2010-07-09 at 10:36 -0700, maneela a wrote: > 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 >
