Re: pg_receivexlog and replication slots

From: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>
To: Andres Freund <andres(at)2ndquadrant(dot)com>
Cc: Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, furuyao(at)pm(dot)nttdata(dot)co(dot)jp, PostgreSQL mailing lists <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: pg_receivexlog and replication slots
Date: 2014-10-01 14:21:12
Message-ID: 20141001142112.GT5311@eldon.alvh.no-ip.org
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Andres Freund wrote:

> From d667f7a63cd62733d88ec5b7228dfd5d7136b9d7 Mon Sep 17 00:00:00 2001
> From: Michael Paquier <michael(at)otacoo(dot)com>
> Date: Mon, 1 Sep 2014 20:48:43 +0900
> Subject: [PATCH 3/4] Refactoring of pg_basebackup utilities
>
> Code duplication is reduced with the introduction of new APIs for each
> individual replication command:
> - IDENTIFY_SYSTEM
> - CREATE_REPLICATION_SLOT
> - DROP_REPLICATION_SLOT
> A couple of variables used to identify a timeline ID are changed as well
> to be more consistent with core code.
> ---
> src/bin/pg_basebackup/pg_basebackup.c | 21 +----
> src/bin/pg_basebackup/pg_receivexlog.c | 38 ++------
> src/bin/pg_basebackup/pg_recvlogical.c | 116 ++++++------------------
> src/bin/pg_basebackup/streamutil.c | 159 +++++++++++++++++++++++++++++++++
> src/bin/pg_basebackup/streamutil.h | 10 +++
> 5 files changed, 207 insertions(+), 137 deletions(-)

Not objecting to any of this, but isn't it a bit funny that a patch that
aims to reduce duplication ends up with more lines than there were
originally?

--
Álvaro Herrera http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services

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