Fix base backup rate limiting in presence of slow i/o

Magnus Hagander <magnus@hagander.net>

Commit: f6508827afe76b2c3735a9ce073620e708d60c79
Author: Magnus Hagander <magnus@hagander.net>
Date: 2016-12-19T09:16:12Z
Releases: 9.4.11
Fix base backup rate limiting in presence of slow i/o

When source i/o on disk was too slow compared to the rate limiting
specified, the system could end up with a negative value for sleep that
it never got out of, which caused rate limiting to effectively be
turned off.

Discussion: https://postgr.es/m/CABUevEy_-e0YvL4ayoX8bH_Ja9w%2BBHoP6jUgdxZuG2nEj3uAfQ%40mail.gmail.com

Analysis by me, patch by Antonin Houska

Files

PathChange+/−
src/backend/replication/basebackup.c modified +7 −17