Correct base backup throttling
Throttling for sending a base backup in walsender is broken for the case where there is a lot of WAL traffic, because the latch used to put the walsender to sleep is also signalled by regular WAL traffic (and each signal causes an additional batch of data to be sent); the net effect is that there is no or little actual throttling. This is undesirable, so rewrite the sleep into a loop to achieve the desired effeect. Author: Jeff Janes, small tweaks by me Reviewed-by: Antonin Houska Discussion: https://postgr.es/m/CAMkU=1xH6mde-yL-Eo1TKBGNd0PB1-TMxvrNvqcAkN-qr2E9mw@mail.gmail.com
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