Is it mandatory parameter recover_target_timeline='latest' in switchover and switchback in PostgreSQL 9.4.1?

Question

I have followed below steps for switchover and switchback.

Step 1:- Disconnect application services from 10.x.x.10 and do the following

@Master(10.x.x.10

Answer 1

If you want switch-back functionality, you will have to set recovery_target_timeline='latest', as any promotion will increment the timeline. Using a fixed target timeline is usually reserved for very specific cases (i.e., you need to recover changes after a split-brain, diverged-timeline scenario).

To answer your specific questions:

1. Yes
2. Yes