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From: Rui DeSousa <rui.desousa@icloud.com>
To: scott ribe <scott_ribe@elevated-dev.com>
Cc: Nagy László Zsolt <gandalf@shopzeus.com>
Cc: pgsql-admin@lists.postgresql.org
Subject: Re: Reliable WAL file shipping over unreliable network
Date: Wed, 28 Feb 2018 13:25:45 -0500
Message-ID: <45F65094-CF9C-4BC4-AF56-2FE299F79EFF@icloud.com> (raw)
In-Reply-To: <9BE48599-5417-42BF-A7D3-554590878841@elevated-dev.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>
	<954e01b6-b240-eb9a-5feb-8efd202fef5a@shopzeus.com>
	<9BE48599-5417-42BF-A7D3-554590878841@elevated-dev.com>



> On Feb 28, 2018, at 1:12 PM, scott ribe <scott_ribe@elevated-dev.com> wrote:
> 
> There seem to be 2 fundamental misunderstandings here:
> 
> 1) That other processes cannot see data written to a file until it is flushed to disk; this is not true; while file data is still in file cache, it is visible to other processes.
> 
> 2) That rsync writes the file on the destination directly; it does not; it writes into a temporary file and renames that file when it is complete.
> 

While you’re correct; I never made either of those assumptions =

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