* [PATCH 12/26] xapcmd: xcpdb supports compaction
2019-05-23 9:36 7% [PATCH 00/26] xcpdb: ease Xapian DB format migrations Eric Wong
@ 2019-05-23 9:36 5% ` Eric Wong
0 siblings, 0 replies; 2+ results
From: Eric Wong @ 2019-05-23 9:36 UTC (permalink / raw)
To: meta
To minimize the delay on active inboxes, it's actually ideal to
run xapian-compact at the end of the per-partition cpdb process;
since the new DB isn't accessible yet and so we don't have to
deal with lock contention with -mda or -watch processes. The
downside is temporary file overhead (3x instead of 2x) required.
---
lib/PublicInbox/Xapcmd.pm | 34 ++++++++++++++++++++++++++++++++--
script/public-inbox-xcpdb | 8 ++++++--
2 files changed, 38 insertions(+), 4 deletions(-)
diff --git a/lib/PublicInbox/Xapcmd.pm b/lib/PublicInbox/Xapcmd.pm
index ca74ea0..d2de874 100644
--- a/lib/PublicInbox/Xapcmd.pm
+++ b/lib/PublicInbox/Xapcmd.pm
@@ -8,6 +8,10 @@ use PublicInbox::Over;
use File::Temp qw(tempdir);
use File::Path qw(remove_tree);
+# support testing with dev versions of Xapian which installs
+# commands with a version number suffix (e.g. "xapian-compact-1.5")
+our $XAPIAN_COMPACT = $ENV{XAPIAN_COMPACT} || 'xapian-compact';
+
sub commit_changes ($$$) {
my ($im, $old, $new) = @_;
my @st = stat($old) or die "failed to stat($old): $!\n";
@@ -38,17 +42,23 @@ sub xspawn {
}
}
+sub runnable_or_die ($) {
+ my ($exe) = @_;
+ which($exe) or die "$exe not found in PATH\n";
+}
+
sub run {
my ($ibx, $cmd, $env, $opt) = @_;
$opt ||= {};
my $dir = $ibx->{mainrepo} or die "no mainrepo in inbox\n";
my $exe = $cmd->[0];
my $pfx = $exe;
+ runnable_or_die($XAPIAN_COMPACT) if $opt->{compact};
if (ref($exe) eq 'CODE') {
$pfx = 'CODE';
require Search::Xapian::WritableDatabase;
} else {
- which($exe) or die "$exe not found in PATH\n";
+ runnable_or_die($exe);
}
$ibx->umask_prepare;
my $old = $ibx->search->xdir(1);
@@ -107,11 +117,12 @@ sub cpdb {
my ($args, $env, $opt) = @_;
my ($old, $new) = @$args;
my $src = Search::Xapian::Database->new($old);
+ my $tmp = $opt->{compact} ? "$new.compact" : $new;
# like copydatabase(1), be sure we don't overwrite anything in case
# of other bugs:
my $creat = Search::Xapian::DB_CREATE();
- my $dst = Search::Xapian::WritableDatabase->new($new, $creat);
+ my $dst = Search::Xapian::WritableDatabase->new($tmp, $creat);
my ($it, $end);
do {
@@ -140,6 +151,25 @@ sub cpdb {
# (and public-inbox does not use those features)
};
} while (cpdb_retryable($src, $@));
+
+ return unless $opt->{compact};
+
+ $src = $dst = undef; # flushes and closes
+
+ # this is probably the best place to do xapian-compact
+ # since $dst isn't readable by HTTP or NNTP clients, yet:
+ my $cmd = [ $XAPIAN_COMPACT, '--no-renumber', $tmp, $new ];
+ my $rdr = {};
+ foreach my $fd (0..2) {
+ defined(my $dst = $opt->{$fd}) or next;
+ $rdr->{$fd} = $dst;
+ }
+ my $pid = spawn($cmd, $env, $rdr);
+ my $r = waitpid($pid, 0);
+ if ($? || $r != $pid) {
+ die join(' ', @$cmd)." failed: $? (pid=$pid, reaped=$r)\n";
+ }
+ remove_tree($tmp) or die "failed to remove $tmp: $!\n";
}
1;
diff --git a/script/public-inbox-xcpdb b/script/public-inbox-xcpdb
index d494991..78d37da 100755
--- a/script/public-inbox-xcpdb
+++ b/script/public-inbox-xcpdb
@@ -2,17 +2,21 @@
# Copyright (C) 2019 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# xcpdb: Xapian copy database, a wrapper around Xapian's copydatabase(1)
+use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
use PublicInbox::InboxWritable;
use PublicInbox::Xapcmd;
use PublicInbox::Admin;
PublicInbox::Admin::require_or_die('-search');
my $usage = "Usage: public-inbox-xcpdb INBOX_DIR\n";
+my $opt = {};
+GetOptions($opt, qw(compact)) or die "bad command-line args\n$usage";
my @ibxs = PublicInbox::Admin::resolve_inboxes(\@ARGV) or die $usage;
+
my $cmd = [ \&PublicInbox::Xapcmd::cpdb ];
open my $null, '>', '/dev/null' or die "failed to open /dev/null: $!\n";
-my $rdr = { 1 => fileno($null) };
+$opt->{1} = fileno($null);
foreach (@ibxs) {
my $ibx = PublicInbox::InboxWritable->new($_);
# we rely on --no-renumber to keep docids synched to NNTP
- PublicInbox::Xapcmd::run($ibx, $cmd, undef, $rdr);
+ PublicInbox::Xapcmd::run($ibx, $cmd, undef, $opt);
}
--
EW
^ permalink raw reply related [relevance 5%]
* [PATCH 00/26] xcpdb: ease Xapian DB format migrations
@ 2019-05-23 9:36 7% Eric Wong
2019-05-23 9:36 5% ` [PATCH 12/26] xapcmd: xcpdb supports compaction Eric Wong
0 siblings, 1 reply; 2+ results
From: Eric Wong @ 2019-05-23 9:36 UTC (permalink / raw)
To: meta
I've noticed performance problems in Xapian's old chert
backend which seem alleviated with the new glass backend;
particularly related to phrase searches.
Unfortunately, the tool distributed with Xapian for updating DB
formats, copydatabase(1), is extremely slow and blocking updates
for hours at a time to perform the migration is not acceptable.
(That's right, "copydatabase" is NOT a Postgres command!)
So, I've written "public-inbox-xcpdb" and gotten it to perform
the bulk copy operation without holding inbox.lock and have it
deal gracefully with Xapian DB modifications. xcpdb is still
slow, but I've (finally!) implemented partial reindexing to
allow it to minimize the lock time and not stall -mda or -watch
processes while it is working.
There's a bunch of cleanups along the way, too; and it should
make future changes to repartition the Xapian DB on existing v2
inboxes easier.
Eric Wong (26):
t/convert-compact: skip on missing xapian-compact(1)
v1writable: retire in favor of InboxWritable
doc: document the reason for --no-renumber
search: reenable phrase search on non-chert Xapian
xapcmd: new module for wrapping Xapian commands
admin: hoist out resolve_inboxes for -compact and -index
xapcmd: support spawn options
xcpdb: new tool which wraps Xapian's copydatabase(1)
xapcmd: do not cleanup on errors
admin: move index_inbox over
xcpdb: implement using Perl bindings
xapcmd: xcpdb supports compaction
v2writable: hoist out log_range sub for readability
xcpdb: use fine-grained locking
xcpdb: implement progress reporting
xcpdb: cleanup error handling and diagnosis
xapcmd: avoid EXDEV when finalizing changes
doc: xcpdb: update to reflect the current state
xapcmd: use "print STDERR" for progress reporting
xcpdb: show re-indexing progress
xcpdb: remove temporary directories on aborts
compact: reuse infrastructure from xcpdb
xcpdb|compact: support some xapian-compact switches
xapcmd: cleanup on interrupted xcpdb "--compact"
xcpdb|compact: support --jobs/-j flag like gmake(1)
xapcmd: do not reset %SIG until last Xtmpdir is done
Documentation/include.mk | 6 +-
Documentation/public-inbox-v1-format.pod | 4 +
Documentation/public-inbox-v2-format.pod | 4 +
Documentation/public-inbox-xcpdb.pod | 57 ++++
MANIFEST | 4 +-
lib/PublicInbox/Admin.pm | 66 ++++
lib/PublicInbox/InboxWritable.pm | 35 ++-
lib/PublicInbox/Search.pm | 48 +--
lib/PublicInbox/SearchIdx.pm | 34 ++-
lib/PublicInbox/V1Writable.pm | 34 ---
lib/PublicInbox/V2Writable.pm | 109 ++++---
lib/PublicInbox/Xapcmd.pm | 370 +++++++++++++++++++++++
script/public-inbox-compact | 102 +------
script/public-inbox-index | 102 +------
script/public-inbox-init | 13 +-
script/public-inbox-xcpdb | 19 ++
t/cgi.t | 4 +-
t/convert-compact.t | 4 +
t/indexlevels-mirror.t | 27 +-
t/init.t | 4 +-
t/nntpd.t | 15 +-
t/search.t | 1 +
t/v2mirror.t | 1 +
23 files changed, 740 insertions(+), 323 deletions(-)
create mode 100644 Documentation/public-inbox-xcpdb.pod
delete mode 100644 lib/PublicInbox/V1Writable.pm
create mode 100644 lib/PublicInbox/Xapcmd.pm
create mode 100755 script/public-inbox-xcpdb
--
EW
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