Re: Proposal to lower the minimum limit for phi_convict_threshold

2012-01-21 Thread Radim Kolar
Anyway, I can't find any reason to limit minimum value of phi_convict_threshold to 5. maki In real world you often want to have 9 because cassandra is too much sensitive to overloaded LAN and nodes are flipping up/down often and creating chaos in cluster if you have larger number of nodes (let s

Proposal to lower the minimum limit for phi_convict_threshold

2012-01-21 Thread Maki Watanabe
Hello, The current trunk limit the value of phi_convict_threshold from 5 to 16 in DatabaseDescriptor.java. And phi value is calculated in FailureDetector.java as PHI_FACTOR x time_since_last_gossip / mean_heartbeat_interval And the PHI_FACTOR is a predefined value: PHI_FACTOR = 1 / Log(10) =~ 0