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Re: Streaming a base backup from master

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Dave Page <dpage(at)pgadmin(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Streaming a base backup from master
Date: 2010-09-03 11:50:09
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Lists: pgsql-hackers
On Fri, Sep 3, 2010 at 13:48, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> On 03/09/10 14:28, Dave Page wrote:
>> On Fri, Sep 3, 2010 at 12:19 PM, Heikki Linnakangas
>> <heikki(dot)linnakangas(at)enterprisedb(dot)com>  wrote:
>>> Here's a WIP patch. It adds a new "TAKE_BACKUP" command to the
>>> replication
>>> command set. Upon receiving that command, the master starts a COPY, and
>>> streams a tarred copy of the data directory to the client. The patch
>>> includes a simple command-line tool, pg_streambackup, to connect to a
>>> server
>>> and request a backup that you can then redirect to a .tar file or pipe to
>>> "tar x".
>> Cool. Can you add a TODO to build in code to un-tar the archive? tar
>> is not usually found on Windows systems, and as we already have tar
>> extraction code in pg_restore it could presumably be added relatively
>> painlessly.
> Ok. Another obvious thing that people will want is to gzip the tar file
> while sending it, to reduce network traffic.

Not necessarily obvious, needs to be configurable. There are a lot of
cases where you might not want it.

 Magnus Hagander

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