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Posted to oak-issues@jackrabbit.apache.org by "Stefan Egli (JIRA)" <ji...@apache.org> on 2015/03/25 17:56:53 UTC

[jira] [Created] (OAK-2682) Introduce time difference detection for mongoMk

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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