Re: Understanding Cassandra tuning

2016-03-25 Thread Giampaolo Trapasso
Yes, RF=1 as https://gist.github.com/giampaolotrapasso/9f0242fc60144ada458c#file-stress-yaml and there you can find also my stress schema. Any case, with a so low throughput I think I should move to other type of AWS instances before repeating the test and investigate further on tuning. Thanks,

Re: Understanding Cassandra tuning

2016-03-25 Thread Jack Krupansky
Your IOPS and throughput seem to be below the AWS limits, but... I wonder if replication is doubling those numbers and then a little write amplification may then bump you into the AWS limits. See: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-io-characteristics.html What RF are you

Understanding Cassandra tuning

2016-03-25 Thread Giampaolo Trapasso
Hi to all, I want to understand better Cassandra 2.2.5 tuning for my app (and C* tuning in general). In the app I'm developing, the typical scenario is the upload on cluster of a large binary file (in the order of GBs). Long story short, after many failed try to get specific upload throughput