From: Andres Freund <andres@anarazel.de>
To: Fujii Masao <masao.fujii@gmail.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Martijn van Oosterhout <kleptog@svana.org>
Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>
Subject: Re: WAL logging problem in 9.4.3?
Date: Fri, 3 Jul 2015 18:49:31 +0200
Message-ID: <20150703164931.GI3291@awork2.anarazel.de> (raw)
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On 2015-07-04 01:39:42 +0900, Fujii Masao wrote:
> Okay, so probably we need to change WAL replay of TRUNCATE so that
> the index file is truncated to one containing only meta page instead of
> empty one. That is, the WAL replay of TRUNCATE would need to call
> index_build() after smgrtruncate() maybe.
>
> Then how should we implement that? Invent new WAL record type that
> calls smgrtruncate() and index_build() during WAL replay? Or add the
> special flag to XLOG_SMGR_TRUNCATE record, and make WAL replay
> call index_build() only if the flag is found? Any other good idea?
> Anyway ISTM that we might need to add or modify WAL record.
It's easy enough to log something like a metapage with
log_newpage().
But the more interesting question is why that's not hhappening
today. RelationTruncateIndexes() does call the index_build() which
should end up WAL logging the index creation.
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Cc: andres@anarazel.de, masao.fujii@gmail.com, tgl@sss.pgh.pa.us, kleptog@svana.org
Subject: Re: WAL logging problem in 9.4.3?
In-Reply-To: <20150703164931.GI3291@awork2.anarazel.de>
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