The following review has been posted through the commitfest application:
make installcheck-world:  tested, passed
Implements feature:       tested, passed
Spec compliant:           tested, passed
Documentation:            tested, failed

Hi! 
This looks like a reasonable improvement.
However, i have some questions about realization.

1. In general case we use $$ to add pid to temp_path, whereas on windows we do 
not use this.
I believe, this can cause name collision, which is not great.
2. In documentation [1] we do not specify that archive command needs to be 
atomic. Furthermore, we use actual cp as an example.
This can lead to similar problems not only in tests.

Thank you!

[1] 
https://www.postgresql.org/docs/current/continuous-archiving.html#BACKUP-ARCHIVING-WAL
Best regards, Stepan Filippov.

The new status of this patch is: Waiting on Author

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