Re: Host score calculation for dynamic_snitch

2011-04-09 Thread aaron morton
Recent discussion on dynamic snitch for some background http://www.mail-archive.com/user@cassandra.apache.org/msg12089.html 1) Adapted phi failure detector as used by gossip, see o.a.c.locator.DynamicEndpointSnitch 2) tracks last 100 responses from a node 3) in memory only 4) it's expensive w

Host score calculation for dynamic_snitch

2011-04-08 Thread A J
dynamic_snitch seems to do host score calculation to figure the latency of each node. What are the details of this calculation : 1. What is the mechanism to determine latency ? 2. Does it score the calculated scores and use the historical figures to come up with the latest scores ? (You can't just