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Re: Streaming a base backup from master

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Dave Page <dpage(at)pgadmin(dot)org>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Magnus Hagander <magnus(at)hagander(dot)net>
Subject: Re: Streaming a base backup from master
Date: 2010-09-03 13:24:19
Message-ID: AANLkTinC1tP=LWhSUYjvHK-ej+Az_Y6rDWtStWD_3epg@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Sep 3, 2010 at 7:28 AM, Dave Page <dpage(at)pgadmin(dot)org> 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.

It seems like the elephant in the room here is updating an existing
backup without recopying the entire data directory.  Perhaps that's
phase two, but worth keeping in mind...

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise Postgres Company

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Subject: Re: Streaming a base backup from master
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