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DOCS-4246: recover invalid replset config #2100

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DOCS-4246: recover invalid replset config #2100

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16 changes: 16 additions & 0 deletions source/release-notes/2.8-compatibility.txt
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Expand Up @@ -143,6 +143,22 @@ particular note are the following alterations:

- Disallows ``getLastErrorDefaults: 0`` in a config.

.. _recover-from-invalid-config:

Recover a Replica Set from an Invalid Configuration
```````````````````````````````````````````````````

In MongoDB version 2.8, :program:`mongod` will fail to start if it has
an invalid replica set configuration stored in the
:data:`local.system.replset` collection. Due to MongoDB 2.8's strict
validation of replica set configuration objects, a configuration that
was valid in MongoDB 2.6 may not be valid in MongoDB 2.8.

If your replica set configuration was valid in a previous version of
MongoDB and fails to start in MongoDB 2.8, :doc:`downgrade to MongoDB
2.6 </release-notes/2.8-downgrade>`, and reconfigure your replica set to
fulfill the new requirements. Then, you can re-upgrade to MongoDB 2.8.

Remove ``local.slaves`` Collection
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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