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(DOCS-11797): Updated pv1 introduction. #3373

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9 changes: 8 additions & 1 deletion source/reference/replica-set-protocol-versions.txt
Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,14 @@ Replica Set Protocol Version


Starting in version 4.0, MongoDB only supports replica set protocol
version 1 (:rsconf:`pv1 <protocolVersion>`). ``pv1`` is the default for
version 1 (:rsconf:`pv1 <protocolVersion>`).

If you set :rsconf:`protocolVersion` to ``1`` in the replica set
configuration, ``pv1`` is in effect. If you initiate a replica set on
MongoDB 3.2 or later without specifying :rsconf:`protocolVersion`, the
server sets :rsconf:`protocolVersion` to ``1``.

``pv1`` is the default for
all new replica sets created with MongoDB 3.2 or later.

Preservation of Writes
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