Stefan Egli created OAK-2682:
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Summary: Introduce time difference detection for mongoMk
Key: OAK-2682
URL: https://issues.apache.org/jira/browse/OAK-2682
Project: Jackrabbit Oak
Issue Type: Improvement
Components: core, mongomk
Reporter: Stefan Egli
Fix For: 1.1.8
Currently the lease mechanism in DocumentNodeStore/mongoMk is based on the
assumption that the clocks are in perfect sync between all nodes of the
cluster. The lease is valid for 60sec with a timeout of 30sec. If clocks are
off by too much, and background operations happen to take couple seconds, you
run the risk of timing out a lease. So introducing a check which WARNs if the
clocks in a cluster are off by too much (1st threshold, eg 5sec?) would help
increase awareness. Further drastic measure could be to prevent a startup of
Oak at all if the difference is for example higher than a 2nd threshold
(optional I guess, but could be 20sec?).
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