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source/faq.txt

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@@ -54,6 +54,14 @@ To learn more about permissable reads and writes during synchronization, see
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Index builds on the destination cluster are treated as writes
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while ``mongosync`` is syncing.
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Can I use ``mongosync`` to maintain a Disaster Recovery cluster?
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----------------------------------------------------------------
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No, you can't currently maintain a Disaster Recovery cluster with ``mongosync``,
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since ``mongosync`` **must :ref:`<c2c-api-commit>`** in order to
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safely accept traffic to the destination cluster.
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For more information, see :ref:`c2c-faq-reads-writes-mongosync`.
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Why are the destination cluster indexes larger than the source cluster indexes?
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-------------------------------------------------------------------------------
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No, you can't configure ``mongosync`` to customize chunk distributions
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on a destination sharded cluster. ``mongosync`` samples each collection
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during initialization to determine how to distribute documents
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efficiently across the destination cluster’s shards after migration.
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Can I use ``mongosync`` to set up a Disaster Recovery cluster?
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--------------------------------------------------------------
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No, you can't currently set up a Disaster Recovery cluster with ``mongosync``,
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since ``mongosync`` **must commit** in order to safely accept traffic to the
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destination cluster. For more information, see :ref:`c2c-faq-reads-writes-mongosync`.
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efficiently across the destination cluster’s shards after migration.
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Until you've called commit on ``mongosync`` and ``canWrite`` successfully
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Until you've called :ref:`<c2c-api-commit>` on ``mongosync`` and ``canWrite`` successfully
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returns ``true``, the destination cluster cannot be used to accept
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application read or write traffic.
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Do not use ``mongosync`` for maintaining Disaster Recovery clusters.

source/reference/mongosync/mongosync-behavior.txt

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Considerations for Continuous Sync
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----------------------------------
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For any continuous synchronization use cases with ``mongosync``, ensure that
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``mongosync`` commits before cutting over from the source to the
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destination.
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.. important::
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.. include:: /includes/fact-no-mongosync-disaster-recovery.rst

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