Maxim Rusak created GOSSIP-74:
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Summary: Critical bugs in FailureDetector
Key: GOSSIP-74
URL: https://issues.apache.org/jira/browse/GOSSIP-74
Project: Gossip
Issue Type: Bug
Reporter: Maxim Rusak
Assignee: Maxim Rusak
Now FailureDetector have (at least) 2 bugs (in comparation to original paper):
1. latestHeartbeatMs don't update on each HeartBeat. So we have
descriptiveStatistics consisted not from deltas between heartbeats but from
time periods from first heartbeats.
2. when we create normalDistribution we pass variation, not standard deviation.
They make FailureDetector totally indifferent due to extremely high deviation.
Example: http://pastebin.com/xaeF52PP
Here we send 100 heartbeats, one per second(for example), then we check the
state after 2000 seconds, and comparing to threshold it's still alive.
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