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https://issues.apache.org/jira/browse/OAK-2682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14680012#comment-14680012
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Julian Reschke commented on OAK-2682:
-------------------------------------
Looking at the Javadoc:
+ /**
+ * @return the estimated time difference in milliseconds between
+ * the local instance and the (typically common, shared) document server
system.
+ * The value can be zero if the times are estimated to be equal,
+ * positive when the local instance is ahead of the remote server
+ * and negative when the local instance is behind the remote server. An
invocation is not cached
+ * and typically requires a round-trip to the server (but that is not a
requirement).
+ * @throws UnsupportedOperationException if this DocumentStore does not
support this method
+ */
So are you asking for the difference between the system clocks of the local
machine and the machine on which the database runs? How is this information
relevant at all? (I'm very confused now :-)
> Introduce time difference detection for DocumentNodeStore
> ---------------------------------------------------------
>
> Key: OAK-2682
> URL: https://issues.apache.org/jira/browse/OAK-2682
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: core, mongomk
> Reporter: Stefan Egli
> Assignee: Stefan Egli
> Labels: resilience
> Fix For: 1.3.5
>
> Attachments: OAK-2682.patch
>
>
> 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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