Re: pg_rewind in contrib

> I have committed this, with some more kibitzing. hope I have not missed
> any comments given so far. Many thanks for the review, and please continue
> reviewing and testing it :-).

I have been testing the pg_rewind and have an analysis to share along with
few questions -

I had a streaming replication setup with one master and one slave running
successfully.

Test 1 :

- Killed postgres process on master and promoted slave. Both were in sync
earlier.
- performed some operations (data changes) on newly promoted slave node and
shutdown
- Executed pg_rewind on old master and got the below message

*target server must be shut down cleanly*
*Failure, exiting*

If the master is crashed or killed abruptly, it may not be possible to do a
rewind. Is my understanding correct ?

Test 2 :

- On a successfully running streaming replication with one master and one
slave, i did a clean shutdown of master
- promoted slave
- performed some operations (data changes) on newly promoted slave and did
a clean shutdown
- Executed pg_rewind on the old master to sync with the latest changes on
new master. I got the below message

*The servers diverged at WAL position 0/A2000098 on timeline 1.*
*No rewind required.*

I am not getting this too.

Regards,
Venkata Balaji N