1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
| | # Copyright (C) 2018-2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Internal interface for a single Xapian shard in V2 inboxes.
# See L<public-inbox-v2-format(5)> for more info on how we shard Xapian
package PublicInbox::SearchIdxShard;
use strict;
use v5.10.1;
use parent qw(PublicInbox::SearchIdx);
use IO::Handle (); # autoflush
use PublicInbox::Eml;
sub new {
my ($class, $v2w, $shard) = @_;
my $ibx = $v2w->{ibx};
my $self = $class->SUPER::new($ibx, 1, $shard);
# create the DB before forking:
$self->idx_acquire;
$self->set_metadata_once;
$self->idx_release;
$self->spawn_worker($v2w, $shard) if $v2w->{parallel};
$self;
}
sub spawn_worker {
my ($self, $v2w, $shard) = @_;
my ($r, $w);
pipe($r, $w) or die "pipe failed: $!\n";
$w->autoflush(1);
my $pid = fork;
defined $pid or die "fork failed: $!\n";
if ($pid == 0) {
my $bnote = $v2w->atfork_child;
close $w or die "failed to close: $!";
# F_SETPIPE_SZ = 1031 on Linux; increasing the pipe size here
# speeds V2Writable batch imports across 8 cores by nearly 20%
fcntl($r, 1031, 1048576) if $^O eq 'linux';
eval { shard_worker_loop($self, $v2w, $r, $shard, $bnote) };
die "worker $shard died: $@\n" if $@;
die "unexpected MM $self->{mm}" if $self->{mm};
exit;
}
$self->{pid} = $pid;
$self->{w} = $w;
close $r or die "failed to close: $!";
}
# this reads all the writes to $self->{w} from the parent process
sub shard_worker_loop ($$$$$) {
my ($self, $v2w, $r, $shard, $bnote) = @_;
$0 = "pi-v2-shard[$shard]";
$self->begin_txn_lazy;
while (my $line = readline($r)) {
$v2w->{current_info} = "[$shard] $line";
if ($line eq "commit\n") {
$self->commit_txn_lazy;
} elsif ($line eq "close\n") {
$self->idx_release;
} elsif ($line eq "barrier\n") {
$self->commit_txn_lazy;
# no need to lock < 512 bytes is atomic under POSIX
print $bnote "barrier $shard\n" or
die "write failed for barrier $!\n";
} elsif ($line =~ /\AD ([a-f0-9]{40,}) ([0-9]+)\n\z/s) {
$self->remove_by_oid($1, $2 + 0);
} else {
chomp $line;
# n.b. $mid may contain spaces(!)
my ($to_read, $bytes, $num, $blob, $ds, $ts, $tid, $mid)
= split(/ /, $line, 8);
$self->begin_txn_lazy;
my $n = read($r, my $msg, $to_read) or die "read: $!\n";
$n == $to_read or die "short read: $n != $to_read\n";
my $mime = PublicInbox::Eml->new(\$msg);
my $smsg = bless {
bytes => $bytes,
num => $num + 0,
blob => $blob,
mid => $mid,
tid => $tid,
ds => $ds,
ts => $ts,
}, 'PublicInbox::Smsg';
$self->add_message($mime, $smsg);
}
}
$self->worker_done;
}
sub index_raw {
my ($self, $msgref, $eml, $smsg) = @_;
if (my $w = $self->{w}) {
# mid must be last, it can contain spaces (but not LF)
print $w join(' ', @$smsg{qw(raw_bytes bytes
num blob ds ts tid mid)}),
"\n", $$msgref or die "failed to write shard $!\n";
} else {
if ($eml) {
undef $$msgref;
} else { # --xapian-only + --sequential-shard:
$eml = PublicInbox::Eml->new($msgref);
}
$self->begin_txn_lazy;
$self->add_message($eml, $smsg);
}
}
sub atfork_child {
close $_[0]->{w} or die "failed to close write pipe: $!\n";
}
sub shard_barrier {
my ($self) = @_;
if (my $w = $self->{w}) {
print $w "barrier\n" or die "failed to print: $!";
} else {
$self->commit_txn_lazy;
}
}
sub shard_commit {
my ($self) = @_;
if (my $w = $self->{w}) {
print $w "commit\n" or die "failed to write commit: $!";
} else {
$self->commit_txn_lazy;
}
}
sub shard_close {
my ($self) = @_;
if (my $w = delete $self->{w}) {
my $pid = delete $self->{pid} or die "no process to wait on\n";
print $w "close\n" or die "failed to write to pid:$pid: $!\n";
close $w or die "failed to close pipe for pid:$pid: $!\n";
waitpid($pid, 0) == $pid or die "remote process did not finish";
$? == 0 or die ref($self)." pid:$pid exited with: $?";
} else {
die "transaction in progress $self\n" if $self->{txn};
$self->idx_release if $self->{xdb};
}
}
sub shard_remove {
my ($self, $oid, $num) = @_;
if (my $w = $self->{w}) { # triggers remove_by_oid in a shard child
print $w "D $oid $num\n" or die "failed to write remove $!";
} else { # same process
$self->remove_by_oid($oid, $num);
}
}
1;
|