]> Sergey Matveev's repositories - public-inbox.git/blob - lib/PublicInbox/SearchIdxShard.pm
daemon: unlink .oldbin PID file correctly
[public-inbox.git] / lib / PublicInbox / SearchIdxShard.pm
1 # Copyright (C) 2018-2020 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
3
4 # used to interface with a single Xapian shard in V2 repos.
5 # See L<public-inbox-v2-format(5)> for more info on how we shard Xapian
6 package PublicInbox::SearchIdxShard;
7 use strict;
8 use warnings;
9 use base qw(PublicInbox::SearchIdx);
10 use IO::Handle (); # autoflush
11
12 sub new {
13         my ($class, $v2writable, $shard) = @_;
14         my $self = $class->SUPER::new($v2writable->{-inbox}, 1, $shard);
15         # create the DB before forking:
16         $self->_xdb_acquire;
17         $self->_xdb_release;
18         $self->spawn_worker($v2writable, $shard) if $v2writable->{parallel};
19         $self;
20 }
21
22 sub spawn_worker {
23         my ($self, $v2w, $shard) = @_;
24         my ($r, $w);
25         pipe($r, $w) or die "pipe failed: $!\n";
26         binmode $r, ':raw';
27         binmode $w, ':raw';
28         $w->autoflush(1);
29         my $pid = fork;
30         defined $pid or die "fork failed: $!\n";
31         if ($pid == 0) {
32                 my $bnote = $v2w->atfork_child;
33                 close $w or die "failed to close: $!";
34
35                 # F_SETPIPE_SZ = 1031 on Linux; increasing the pipe size here
36                 # speeds V2Writable batch imports across 8 cores by nearly 20%
37                 fcntl($r, 1031, 1048576) if $^O eq 'linux';
38
39                 eval { shard_worker_loop($self, $v2w, $r, $shard, $bnote) };
40                 die "worker $shard died: $@\n" if $@;
41                 die "unexpected MM $self->{mm}" if $self->{mm};
42                 exit;
43         }
44         $self->{pid} = $pid;
45         $self->{w} = $w;
46         close $r or die "failed to close: $!";
47 }
48
49 sub shard_worker_loop ($$$$$) {
50         my ($self, $v2w, $r, $shard, $bnote) = @_;
51         $0 = "pi-v2-shard[$shard]";
52         $self->begin_txn_lazy;
53         while (my $line = $r->getline) {
54                 $v2w->{current_info} = "[$shard] $line";
55                 if ($line eq "commit\n") {
56                         $self->commit_txn_lazy;
57                 } elsif ($line eq "close\n") {
58                         $self->_xdb_release;
59                 } elsif ($line eq "barrier\n") {
60                         $self->commit_txn_lazy;
61                         # no need to lock < 512 bytes is atomic under POSIX
62                         print $bnote "barrier $shard\n" or
63                                         die "write failed for barrier $!\n";
64                 } elsif ($line =~ /\AD ([a-f0-9]{40,}) (.+)\n\z/s) {
65                         my ($oid, $mid) = ($1, $2);
66                         $self->begin_txn_lazy;
67                         $self->remove_by_oid($oid, $mid);
68                 } else {
69                         chomp $line;
70                         my ($bytes, $num, $blob, $mid, $ds, $ts) =
71                                                         split(/ /, $line);
72                         $self->begin_txn_lazy;
73                         my $n = read($r, my $msg, $bytes) or die "read: $!\n";
74                         $n == $bytes or die "short read: $n != $bytes\n";
75                         my $mime = PublicInbox::MIME->new(\$msg);
76                         my $smsg = bless {
77                                 bytes => $bytes,
78                                 num => $num + 0,
79                                 blob => $blob,
80                                 mid => $mid,
81                                 ds => $ds,
82                                 ts => $ts,
83                         }, 'PublicInbox::Smsg';
84                         $self->add_message($mime, $smsg);
85                 }
86         }
87         $self->worker_done;
88 }
89
90 # called by V2Writable
91 sub index_raw {
92         my ($self, $msgref, $mime, $smsg) = @_;
93         if (my $w = $self->{w}) {
94                 print $w join(' ', @$smsg{qw(bytes num blob mid ds ts)}),
95                         "\n", $$msgref or die "failed to write shard $!\n";
96         } else {
97                 $$msgref = undef;
98                 $self->begin_txn_lazy;
99                 $self->add_message($mime, $smsg);
100         }
101 }
102
103 sub atfork_child {
104         close $_[0]->{w} or die "failed to close write pipe: $!\n";
105 }
106
107 # called by V2Writable:
108 sub remote_barrier {
109         my ($self) = @_;
110         if (my $w = $self->{w}) {
111                 print $w "barrier\n" or die "failed to print: $!";
112         } else {
113                 $self->commit_txn_lazy;
114         }
115 }
116
117 1;