Hi all, On an unrelated observation of the below readings, it looks like all the 3 nodes own 100% of the data. This confuses me a bit. We have a 12 node cluster with RF=3 but the effective ownership is shown as 8.33 % .
So here is my question. How is the ownership calculated : Is Replica factor considered in the ownership calculation ? ( If yes , then 8.33 % ownership of a cluster seems wrong to me . If not 100% ownership for a node cluster seems wrong to me. Am I missing something in the calculation? Regards, Ananth On Fri, Nov 9, 2012 at 4:37 PM, Wei Zhu <wz1...@yahoo.com> wrote: > Hi All, > I am doing a benchmark on a Cassandra. I have a three node cluster with > RF=3. I generated 6M rows with sequence number from 1 to 6m, so the rows > should be evenly distributed among the three nodes disregarding the > replicates. > I am doing a benchmark with read only requests, I generate read request > for randomly generated keys from 1 to 6M. Oddly, nodetool cfstats, reports > that one node has only half the requests as the other one and the third > node sits in the middle. So the ratio is like 2:3:4. The node with the most > read requests actually has the smallest latency and the one with the least > read requests reports the largest latency. The difference is pretty big, > the fastest is almost double the slowest. > All three nodes have the exactly the same hardware and the data size on > each node are the same since the RF is three and all of them have the > complete data. I am using Hector as client and the random read request are > in millions. I can't think of a reasonable explanation. Can someone please > shed some lights? > > Thanks. > -Wei >
