Differential D15696 Diff 37832 src/docs/user/cluster/cluster_databases.diviner

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	be slow, so offloading it to a replica can make the perforance of the master			be slow, so offloading it to a replica can make the perforance of the master
	more consistent.			more consistent.

	To dump from a replica, wait for this TODO to be resolved and then do whatever			To dump from a replica, wait for this TODO to be resolved and then do whatever
	it says to do:			it says to do:

	TODO: Make `bin/storage dump` replica-aware. See T10758.			TODO: Make `bin/storage dump` replica-aware. See T10758.

				With recent versions of MySQL, it is also possible to configure a //delayed//
				replica which intentionally lags behind the master (say, by 12 hours). In the
				event of a bad mutation, this could give you a larger window of time to
				recognize the issue and recover the lost data from the delayed replica (which
				might be quick) without needing to restore backups (which might be very slow).

				Delayed replication is outside the scope of this document, but may be worth
				considering as an additional data security step on top of backup snapshots
				depending on your resources and needs. If you configure a delayed replica, do
				not add it to the `cluster.databases` configuration: Phabricator should never
				send traffic to it, and does not need to know about it.


	Next Steps			Next Steps
	==========			==========

	Continue by:			Continue by:

	- returning to @{article:Clustering Introduction}.			- returning to @{article:Clustering Introduction}.