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  1. Core Server
  2. SERVER-19979

Detect replset clock skew from electionids

    • Type: Icon: Improvement Improvement
    • Resolution: Unresolved
    • Priority: Icon: Major - P3 Major - P3
    • None
    • Affects Version/s: None
    • Component/s: Replication
    • Labels:
    • Replication

      A replset member can detect clock skew between itself and a newly elected primary by checking the timestamp in the newly-elected member's election id, and comparing that to the local time when the member has first noticed the other member becoming PRIMARY. This requires that there be a recent previous heartbeat (eg. < 10s ago) showing the other member in not-PRIMARY state.

      This is motivated by replset clock skew > 30s having more effect now that election ids are being used to notice stale primaries.

            backlog-server-repl [DO NOT USE] Backlog - Replication Team
            kevin.pulo@mongodb.com Kevin Pulo
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