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   :title: Single Master Setup in Galera Cluster
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.. _`kb-best-single-master-setup`:

=======================
Single Master Setup
=======================

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   Length: 81 words; Published: June 24, 2015; Updated: October 22, 2019; Category: Topology; Type: Best Practices

If a cluster uses only one node as a master, there are certain requirements (e.g., the slave queue size) that can be relaxed.


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.. rubric:: Recommendations

To relax flow control, you might use the settings below:

.. code-block:: ini

    wsrep_provider_options = "gcs.fc_limit = 256;
                              gcs.fc_factor = 0.99;
                              gcs.fc_master_slave = YES"

By reducing the rate of flow control events, these settings may improve replication performance.

.. note:: You can also use this setting as sub-optimal in a multi-master setup.