Hi all Hope you all doing good I am working on benchmarking Cassandra using Cassandra stress tool and results are not very impressive. I really some help to tune Cassandra to get great results. Below is my environment and test results and attached is Cassandra.yaml I am using for the test.
I am running single node Cassandra virtual machine and 1 SSD disk in VMWare ESXi 6.7 eventually I want to scale the database to 4 fours once I get the expected results in the single node. Attached is the Cassandra.yaml file is used for configuring database. The result I am getting is not very impressive operations/sec is very low and the latency is very high for the reads here is the results it got from the test. Load command: Cassandra-stress write n=4000000000 -rate threads=96 -node $node1 -log file=load_400M.log Results: Op rate : 2,347 op/s [READ: 2,347 op/s] Partition rate : 2,347 pk/s [READ: 2,347 pk/s] Row rate : 2,347 row/s [READ: 2,347 row/s] Latency mean : 381.1 ms [READ: 381.1 ms] Latency median : 327.4 ms [READ: 327.4 ms] Latency 95th percentile : 836.2 ms [READ: 836.2 ms] Latency 99th percentile : 1138.8 ms [READ: 1,138.8 ms] Latency 99.9th percentile : 1695.5 ms [READ: 1,695.5 ms] Latency max : 6253.7 ms [READ: 6,253.7 ms] Total partitions : 1,000,000 [READ: 1,000,000] Total errors : 0 [READ: 0] Total GC count : 0 Total GC memory : 0.000 KiB Total GC time : 0.0 seconds Avg GC time : NaN ms StdDev GC time : 0.0 ms Total operation time : 00:07:06 The write performance is really impressive with less latency and good operation/sec and when we compare it with reads I feel something is wrong. Read command: Cassandra-stress read n=100000000 no-warmup cl=one -mode native cql3 -schema keyspace="keyspace1" -rate threads=96 -node $node1 -log file=read_10M_test.log Results: Op rate : 35,979 op/s [WRITE: 35,979 op/s] Partition rate : 35,979 pk/s [WRITE: 35,979 pk/s] Row rate : 35,979 row/s [WRITE: 35,979 row/s] Latency mean : 3.3 ms [WRITE: 3.3 ms] Latency median : 2.2 ms [WRITE: 2.2 ms] Latency 95th percentile : 8.2 ms [WRITE: 8.2 ms] Latency 99th percentile : 17.6 ms [WRITE: 17.6 ms] Latency 99.9th percentile : 75.6 ms [WRITE: 75.6 ms] Latency max : 1840.3 ms [WRITE: 1,840.3 ms] Total partitions : 1,600,000,000 [WRITE: 1,600,000,000] Total errors : 0 [WRITE: 0] Total GC count : 0 Total GC memory : 0.000 KiB Total GC time : 0.0 seconds Avg GC time : NaN ms StdDev GC time : 0.0 ms Total operation time : 12:21:10 When I compare the both read and write performance they are not at all consistent and I feel there is some kind of bottleneck with the reads during test. Could you please look into these details and let me know where I am missing I have been struggling hard to get good results out of Cassandra database but I couldn't figure out where I am missing. Please let me know if you need additional information about the Cassandra setup. Thanks and Regards Vinay Kumar Vongour Thanks and Regards Vinay Kumar Vongour
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