DOCSP-38286 Enable ORR (#335)

* DOCSP-38286 Enable ORR

* add to rn

* add beta version

* nit

* *

* final edits

* SO feedback, monospace consistency

* more edits

* ED feedback

* ED more feedback

Author: ajhuh-mdb

Diff for: source/includes/document-filtering-intro.rst

@@ -1,4 +1,4 @@
-Starting in ``mongosync-beta`` 1.8, you can selectively migrate documents based 
-on specific conditions. To further limit which documents migrate to the 
-destination cluster, you can combine document filtering and :ref:`namespace 
-filtering <c2c-filtered-sync>`.
+Starting in {+c2c-beta-program-short+} 1.8, you can selectively migrate 
+documents based on specific conditions. To further limit which documents migrate 
+to the destination cluster, you can combine document filtering and 
+:ref:`namespace filtering <c2c-filtered-sync>`.

Diff for: source/includes/orr-intro.rst

@@ -0,0 +1,5 @@
+Starting in {+c2c-beta-program-short+} 1.8, you can enable Oplog Rollover 
+Resilience (ORR). With ORR,  ``mongosync`` applies changes made on the source 
+cluster to the destination cluster concurrently with initial sync. For source 
+clusters with a high write rate, ORR significantly lowers the risk of oplog 
+rollover during initial sync and reduces the need to restart the sync.

Diff for: source/reference/beta-program.txt

@@ -75,9 +75,6 @@ Beta Features
    * - :ref:`c2c-beta-document-filtering`
      - .. include:: /includes/document-filtering-intro.rst
 
-   * - :ref:`c2c-beta-orr`
-     - # DESCRIPTION TBD 
-
    * - :ref:`c2c-beta-destination-data-handling`
      - .. include:: /includes/destinationDataHandling-introduction.rst
 
@@ -90,6 +87,9 @@ Beta Features
    * - :ref:`c2c-beta-many-to-one`
      - .. include:: /includes/many-to-one-cluster.rst
 
+   * - :ref:`c2c-beta-orr`
+     - .. include:: /includes/orr-intro.rst
+
 .. toctree::
    :titlesonly:
 

Diff for: source/reference/beta-program/orr.txt

@@ -1,8 +1,8 @@
 .. _c2c-beta-orr:
 
-================================
-Enable Oplog Rollover Resilience
-================================
+=========================
+Oplog Rollover Resilience
+=========================
 
 .. default-domain:: mongodb
 
@@ -13,3 +13,54 @@ Enable Oplog Rollover Resilience
    :class: singlecol
 
 .. include:: /includes/beta-feature.rst
+
+Starting in {+c2c-beta-program-short+} 1.8, you can enable Oplog Rollover 
+Resilience (ORR). With ORR,  ``mongosync`` applies changes made on 
+the source cluster to the destination cluster concurrently with initial sync.
+
+By applying changes earlier in the sync process, ``mongosync`` maintains a more 
+recent position in the :term:`oplog`. For source clusters with a high write 
+rate, ORR significantly lowers the risk of oplog rollover during initial sync 
+and reduces the need to restart the sync.
+
+Syntax 
+------
+
+To enable ORR, use ``--oplogRolloverResilienceIntervalSeconds``and specify the 
+interval, in seconds, in which ``mongosync`` checks for eligible change events 
+in the oplog. The default value is ``-1``, which disables ORR.
+
+For example, to start ``mongosync`` with the 
+``oplogRolloverResilienceIntervalSeconds`` set to ``60`` seconds, run the 
+following command: 
+
+.. code-block:: shell 
+   :copyable: false
+
+   ./bin/mongosync \
+         --cluster0 "mongodb://localhost:27000" \
+         --cluster1 "mongodb://localhost:27001" \
+         --oplogRolloverResilienceIntervalSeconds 60
+
+Behavior 
+--------
+
+ORR increases the resilience of ``mongosync`` to oplog rollover during initial 
+sync but does not prevent rollover entirely.
+
+You might exceed the :term:`oplog window` if you: 
+
+- Sync from a high write rate source cluster for an extended
+  period.
+- Pause sync for an extended period.
+
+To increase the size of the oplog on the source cluster, use
+:setting:`~replication.oplogSizeMB`. 
+
+Learn More 
+----------
+
+- :ref:`c2c-beta-program`
+- :ref:`Change Oplog Size <tutorial-change-oplog-size>`
+- :ref:`Workloads that Might Requre a Large Oplog Size 
+  <replica-set-large-oplog-required>`

Diff for: source/release-notes/1.8.txt

@@ -49,20 +49,20 @@ Handle Destination Data with destinationDataHandling Option
 
 For details, see :ref:`c2c-beta-destination-data-handling`.
 
-Set a Migration Name
-````````````````````
-
-.. include:: /includes/migrationName.rst
-
-To learn more, see :ref:`c2c-beta-migration-name`.
-
 Many-to-One Migrations
 ``````````````````````
 
 .. include:: /includes/many-to-one-cluster.rst
 
 To learn more, see :ref:`c2c-beta-many-to-one`.
 
+Set a Migration Name
+````````````````````
+
+.. include:: /includes/migrationName.rst
+
+To learn more, see :ref:`c2c-beta-migration-name`.
+
 Other Notes
 ~~~~~~~~~~~