user/dev discussion of public-inbox itself
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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 2/8] imaptracker: preserve WAL journal_mode if set by user
Date: Thu, 27 Aug 2020 12:17:00 +0000
Message-ID: <20200827121706.4545-3-e@yhbt.net> (raw)
In-Reply-To: <20200827121706.4545-1-e@yhbt.net>

It's no problem for most users to enable WAL, here, since
there's only a single process doing both reading and writing
(unlike the read-only daemons).  However, WAL doesn't work on
network filesystems, so it can't be enabled by default.
---
 lib/PublicInbox/IMAPTracker.pm | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/PublicInbox/IMAPTracker.pm b/lib/PublicInbox/IMAPTracker.pm
index 102a74ce..92f21584 100644
--- a/lib/PublicInbox/IMAPTracker.pm
+++ b/lib/PublicInbox/IMAPTracker.pm
@@ -29,7 +29,12 @@ sub dbh_new ($) {
 		sqlite_use_immediate_transaction => 1,
 	});
 	$dbh->{sqlite_unicode} = 1;
-	$dbh->do('PRAGMA journal_mode = TRUNCATE');
+
+	# TRUNCATE reduces I/O compared to the default (DELETE).
+	# Allow and preserve user-overridden WAL, but don't force it.
+	my $jm = $dbh->selectrow_array('PRAGMA journal_mode');
+	$dbh->do('PRAGMA journal_mode = TRUNCATE') if $jm ne 'wal';
+
 	create_tables($dbh);
 	$dbh;
 }

  parent reply	other threads:[~2020-08-27 12:17 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-27 12:16 [PATCH 0/8] mostly watch-related odds and ends Eric Wong
2020-08-27 12:16 ` [PATCH 1/8] watchmaildir: ensure I:/W:/E: prefixes in warnings Eric Wong
2020-08-27 12:17 ` Eric Wong [this message]
2020-08-27 12:17 ` [PATCH 3/8] overidx: inline create_ghost sub Eric Wong
2020-08-27 12:17 ` [PATCH 4/8] doc: document graceful shutdown signals Eric Wong
2020-08-27 12:17 ` [PATCH 5/8] doc: speling fickses Eric Wong
2020-08-27 12:17 ` [PATCH 6/8] watch: imap: only remove \Seen spam Eric Wong
2020-08-27 12:17 ` [PATCH 7/8] doc: move watch config docs to -watch manpage Eric Wong
2020-08-27 12:17 ` [PATCH 8/8] doc: watch: expand on NNTP and IMAP-specific knobs Eric Wong
2020-08-28  4:22   ` Eric Wong

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user/dev discussion of public-inbox itself

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