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DOCS-13981 clarify read preference nearest #4792

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Jan 13, 2021
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DOCS-13981 clarify read preference nearest #4792

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14 changes: 11 additions & 3 deletions source/includes/read-preference-modes-table.rst
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Expand Up @@ -34,9 +34,17 @@
:ref:`hedged reads <mongos-hedged-reads>` on sharded clusters.

* - :readmode:`nearest`
- Operations read from the member of the :term:`replica set` with
the least network latency, irrespective of whether that member
is a :term:`primary` or :term:`secondary`.
- Operations read from a random eligible :term:`replica set`
member, irrespective of whether that member is a :term:`primary`
or :term:`secondary`, based on a specified latency threshold.
The operation considers the following when calculating latency:

- The :urioption:`localThresholdMS` connection string option
- The :ref:`maxStalenessSeconds
<replica-set-read-preference-max-staleness>` read preference
option
- Any specified :doc:`tag sets
</tutorial/configure-replica-set-tag-sets>`

Starting in version 4.4, :readmode:`nearest` supports
:ref:`hedged reads <mongos-hedged-reads>` on sharded clusters
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