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From: Dianne Skoll <dfs@roaringpenguin.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: Reliable WAL file shipping over unreliable network
Date: Wed, 28 Feb 2018 13:52:20 -0500
Message-ID: <20180228135220.1cd46347@hydrogen.roaringpenguin.com> (raw)
In-Reply-To: <33220469-5BB2-4A40-8F56-8F4F392C95B3@icloud.com>
References: <dd116172-3ddf-ee56-57f3-6e18d49abf8e@shopzeus.com>
	<400AC9CD-1E43-422C-A689-70BDBAFF231E@elevated-dev.com>
	<ee3ae4be-ab24-8443-82c1-95bcd4f86a63@shopzeus.com>
	<debd4205-e27a-cd9d-9169-6748e65083a2@shopzeus.com>
	<BA4A1866-95B0-49C6-8CD1-3D1B60A7837E@elevated-dev.com>
	<CF30D15A-BD42-42A7-9AD3-BB69AF9E8047@icloud.com>
	<D5B11CF5-E816-435B-BFB8-1226E23C046A@elevated-dev.com>
	<37C5A42B-4CDD-4F01-8F1E-1B185C1819B9@icloud.com>
	<20180228132620.2c882f84@hydrogen.roaringpenguin.com>
	<33220469-5BB2-4A40-8F56-8F4F392C95B3@icloud.com>

On Wed, 28 Feb 2018 13:49:33 -0500
Rui DeSousa <rui.desousa@icloud.com> wrote:

> Really? I think you really need to think about it.  You are dealing
> with a race condition.

Not at all, assuming rsync is being called by PostgreSQL's archive_command.

> You are dealing with a race condition involving filesystem metadata.

Nope.  Not true.  What are the things that are racing?

If you rsync data to make a base backup, then yes, use -c... but not because
of any race condition.  Instead, it's because of the coarse filesystem
timestamp granularity.

Regards,

Dianne.




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