Is it necessary to setup a second Postgres node for upgrade to 4.17.01 if I have only one node?

[#1]

Please see the "Required upgrade to Postgres 9.4" Section in the doc below:

http://docs.apigee.com/private-cloud/latest/update-apigee-edge-4160141605-41701

In the lower environments, if I have only one Postgres node, do I need to setup a second node as per the instructions?

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[bkrishnankutty]

@Arjav Goswami

Recommendation for a second slave is to have a quick rollback path, IF in case of an PostgreSQL upgrade failure.

Here are the couple scenarios where second slaves are not REQUIRED

1. IF you have a Storage subsystem (SAN/NAS) level snapshot, which can be used to recreate a new data volume
2. IF you have a slave in the same datacenter as the Primary/Master (Can promote the slave as new master in case of a rollback)