Re: In case of network issues, how long before archive_command does retries

On Wed, 2022-05-18 at 22:51 +0200, Koen De Groote wrote:
> I've got a setup where archive_command will gzip the wal archive to a directory that is itself an NFS mount.
>
> When connection is gone or blocked, archive_command fails after the timeout specified by the NFS mount, as expected. (for a soft mount. hard mount hangs, as expected)
>
> However, on restoring connection, it's not clear to me how long it takes before the command is retried.
>
> Experience says "a few minutes", but I can't find documentation on an exact algorithm.
>
> To be clear, the question is: if archive_command fails, what are the specifics of retrying? Is there a timeout? How is that timeout defined?
>
> Is this detailed somewhere? Perhaps in the source code? I couldn't find it in the documentation.
>
> For detail, I'm using postgres 11, running on Ubuntu 20.

You can find the details in "src/backend/postmaster/pgarch.c".

The archiver will try to archive three times (NUM_ARCHIVE_RETRIES) in an interval
of one second, then back off until it receives a signal, PostgreSQL shutd down
or a minute has passed.

Yours,
Laurenz Albe
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