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  1. Core Server
  2. SERVER-44603

Consider having tailable readPreference "primary" queries killed on stepdown

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Details

    • Improvement
    • Status: Backlog
    • Major - P3
    • Resolution: Unresolved
    • 4.2.0, 4.3.1
    • None
    • Replication
    • None

    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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          is related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-21537 chainingAllowed = false not being enforced after rs.stepDown()

          • Major - P3 - Major loss of function.
          • Closed

          Task - A task that needs to be done. DOCS-13520 Update read preference documentation to include impact of elections

          • Major - P3 - Major loss of function.
          • Closed

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-39621 Disabled chaining should enforce sync source change when the primary steps down even if the oplog fetcher isn't killed on sync source

          • Major - P3 - Major loss of function.
          • Closed

          Activity

            People

              alan.zheng@mongodb.com Alan Zheng
              daniel.gottlieb@mongodb.com Daniel Gottlieb
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              Dates

                Created:
                Updated: