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  1. Core Server
  2. SERVER-7423

Support commands for read preference

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Details

    • New Feature
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • 2.1.1
    • 2.3.1
    • Internal Client, Sharding
    • None

    Description

      The driver's generic command() or runCommand() API should accept a read preference, and obey the preference for these commands:

      group
      inline mapreduce
      aggregate
      collStats, dbStats
      count, distinct
      geoNear, geoSearch, geoWalk
      For these exceptional commands, the driver or mongos obeys the read preference the same as for queries. Otherwise, all commands are run on the primary.

      Note: In the future we'll need to add a field to commands in listCommands to distinguish new commands that should obey the read preference. The slaveOk field alone doesn't cover this: e.g., reindex has slaveOk true, but we've decided that reindex with a read preference of SECONDARY should not reindex a random secondary, it should be run on the primary.

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          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. SERVER-7868 Map/Reduce Does not run on secondaries in a sharded/replica-set configuration

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

          Question - SERVER-7876 Counts running against secondaries with ReadPreference of PrimaryPreferred

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          is related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-23427 Add test to ensure that read-only operations against the config db continue to work if the config server primary is unreachable from mongos

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

          New Feature - A new feature of the product, which has yet to be developed. SERVER-5525 mongos should send inline mapreduce with slaveOk to secondaries

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

          Bug - A problem which impairs or prevents the functions of the product. DOCS-826 Document about mongos support for commands with read preference

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

          New Feature - A new feature of the product, which has yet to be developed. SERVER-4464 drivers and mongos should support 5 read preferences

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

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            People

              randolph@mongodb.com Randolph Tan
              randolph@mongodb.com Randolph Tan
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              Dates

                Created:
                Updated:
                Resolved: