* [PATCH] lei_store: fix locking w.r.t epoch creation
@ 2021-04-29 19:49 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2021-04-29 19:49 UTC (permalink / raw)
To: meta
Prior to this change, it was possible for oneshot lei processes
to race on epoch creation/rollover. lei-daemon normally
prevents the problem by funnelling all writes to a single
socket, but oneshot lei has no such protection.
---
lib/PublicInbox/ExtSearchIdx.pm | 2 +-
lib/PublicInbox/LeiStore.pm | 9 ++++++---
2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/lib/PublicInbox/ExtSearchIdx.pm b/lib/PublicInbox/ExtSearchIdx.pm
index 9d6b3b9d..08f2295a 100644
--- a/lib/PublicInbox/ExtSearchIdx.pm
+++ b/lib/PublicInbox/ExtSearchIdx.pm
@@ -926,7 +926,7 @@ sub update_last_commit { # overrides V2Writable
sub _idx_init { # with_umask callback
my ($self, $opt) = @_;
- PublicInbox::V2Writable::_idx_init($self, $opt);
+ PublicInbox::V2Writable::_idx_init($self, $opt); # acquires ei.lock
$self->{midx} = PublicInbox::MiscIdx->new($self);
}
diff --git a/lib/PublicInbox/LeiStore.pm b/lib/PublicInbox/LeiStore.pm
index fcc9224d..8af740fd 100644
--- a/lib/PublicInbox/LeiStore.pm
+++ b/lib/PublicInbox/LeiStore.pm
@@ -88,6 +88,7 @@ sub importer {
$self->checkpoint;
$max = $self->git_epoch_max + 1;
}
+ my (undef, $tl) = eidx_init($self); # acquire lock
my $pfx = $self->git_pfx;
$max //= $self->git_epoch_max;
while (1) {
@@ -97,7 +98,9 @@ sub importer {
my $git = PublicInbox::Git->new($latest);
if (!$old) {
$git->qx(qw(config core.sharedRepository 0600));
- $self->done; # force eidx_init on next round
+ $self->done; # unlock
+ # re-acquire lock, update alternates for new epoch
+ (undef, $tl) = eidx_init($self);
}
my $packed_bytes = $git->packed_bytes;
my $unpacked_bytes = $packed_bytes / $self->packing_factor;
@@ -130,7 +133,7 @@ sub eidx_init {
my $tl = wantarray && $self->{-err_wr} ?
PublicInbox::OnDestroy->new($$, \&_tail_err, $self) :
undef;
- $eidx->idx_init({-private => 1});
+ $eidx->idx_init({-private => 1}); # acquires lock
wantarray ? ($eidx, $tl) : $eidx;
}
@@ -204,7 +207,7 @@ sub set_sync_info ($$$) {
sub add_eml {
my ($self, $eml, $vmd, $xoids) = @_;
my $im = $self->importer; # may create new epoch
- my ($eidx, $tl) = eidx_init($self); # updates/writes alternates file
+ my ($eidx, $tl) = eidx_init($self);
my $oidx = $eidx->{oidx}; # PublicInbox::Import::add checks this
my $smsg = bless { -oidx => $oidx }, 'PublicInbox::Smsg';
my $im_mark = $im->add($eml, undef, $smsg);
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2021-04-29 19:49 [PATCH] lei_store: fix locking w.r.t epoch creation Eric Wong
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