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Alexander KukushkinandGitHub
5296336f4a
Upon start postmaster process performs various safety checks if there is a postmaster.pid file in the data directory. Although Patroni already detected that the running process corresponding to the postmaster.pid is not a postmaster, the new postmaster might fail to start, because it thinks that postmaster.pid is already locked. Important!!! Unlink of postmaster.pid isn't an option in this case, because it has a lot of nasty race conditions. Luckily there is a workaround to this problem, we can pass the pid from postmaster.pid in the `PG_GRANDPARENT_PID` environment variable and postmaster will ignore it. More likely to hit such problem if you run Patroni and postgres in the docker container.