hesela.devPhi accrual failure detector
A phi accrual failure detector expresses suspicion as the negative base-10 logarithm of an estimated heartbeat inter-arrival tail probability.
A threshold converts the score into an action; the score is not a posterior probability of node failure. Its meaning depends on the arrival model. [1] [3]
Cassandra 5.0.0 scales elapsed time divided by the sampled mean by 1/ln(10) for threshold comparisons and JMX reporting. This differs from the original normal-tail implementation. Seeding, filtering and pause handling also affect behavior. [2]
Relations
- related
- failure-detector, interarrival-time, gray-failure, io-fencing