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  1. Core Server
  2. SERVER-44603

Consider having tailable readPreference "primary" queries killed on stepdown

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    Details

    • Type: Improvement
    • Status: Investigating
    • Priority: Major - P3
    • Resolution: Unresolved
    • Affects Version/s: 4.2.0, 4.3.1
    • Fix Version/s: None
    • Component/s: Replication
    • Labels:
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      Description

      Queries with an explicit readPreference: "primary" are currently allowed to survive stepdown. This behavior is reasonable when the results are bounded. I.e: some results were returned and the remaining results from a getmore are just as consistent as if the node were still a primary.

      However for clients tailing a capped collection (e.g: the oplog), there is no longer a way to guarantee between the driver and server that once a query is opened against a primary, that the node continues to be primary. Applications that desire this guarantee must implement something on their end such as periodically re-issuing the query, or having some side-channel monitoring the replica set state.

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                • Created:
                  Updated: