背景

弊社ではDBのチューニング用にprconaのpt-query-digestを使っている
※スローログの集計に便利な「pt-query-digest」を使ってみよう

突然動かなくなった

何もしてないのに壊れた

Pipeline process 4 (MySQLProtocolParser) caused an error: Argument "" isn't numeric in multiplication (*) at /usr/bin/pt-query-digest line 4525, <STDIN> line 293.
Will retry pipeline process 3 (MySQLProtocolParser) 1 more time.
The pipeline caused an error: Pipeline process 4 (MySQLProtocolParser) caused an error: Argument "" isn't numeric in multiplication (*) at /usr/bin/pt-query-digest line 4525, <STDIN> line 305.
Terminating pipeline because process 3 (MySQLProtocolParser) caused too many errors.

該当箇所を読んでみる

 4519 sub timestamp_diff {
 4520    my ( $start, $end ) = @_;
 4521    my $sd = substr($start, 0, 11, '');
 4522    my $ed = substr($end,   0, 11, '');
 4523    my ( $sh, $sm, $ss ) = split(/:/, $start);
 4524    my ( $eh, $em, $es ) = split(/:/, $end);
 4525    my $esecs = ($eh * 3600 + $em * 60 + $es);
 4526    my $ssecs = ($sh * 3600 + $sm * 60 + $ss);
 4527    if ( $sd eq $ed ) {
 4528       return sprintf '%.6f', $esecs - $ssecs;
 4529    }
 4530    else { # Assume only one day boundary has been crossed, no DST, etc
 4531       return sprintf '%.6f', ( 86_400 - $ssecs ) + $esecs;
 4532    }
 4533 }

何か時間関係でエラーになってるようだ・・・
2019年末には動いていたので、誰かがいじっていなければ2020年になった事が要因と考えられる

フォーラムにあった

全く同じ。2019年のdumpなら動くが2020年になると日付計算でエラーになる模様

修正をアテる

/usr/bin/pt-query.digest

 3627 sub parse_event {
 3628    my ( $self, %args ) = @_;
 3629    my @required_args = qw(next_event tell);
 3630    foreach my $arg ( @required_args ) {
 3631       die "I need a $arg argument" unless $args{$arg};
 3632    }
 3633    my ($next_event, $tell) = @args{@required_args};
 3634
 3635    local $INPUT_RECORD_SEPARATOR = "\n20";
 3636
 3637    my $pos_in_log = $tell->();
 3638    while ( defined(my $raw_packet = $next_event->()) ) {
 3639       next if $raw_packet =~ m/^$/;  # issue 564
 3640       $pos_in_log -= 1 if $pos_in_log;
 3641
 3642       $raw_packet =~ s/\n20\Z//;
 3643       $raw_packet = "20$raw_packet" if $raw_packet =~ /\A20-\d\d-\d\d/; # workaround for year 2020 problem
 3644       $raw_packet = "20$raw_packet" unless $raw_packet =~ m/\A20/;
 3645
 3646       $raw_packet =~ s/0x0000:.+?(450.) /0x0000:  $1 /;
 3647
 3648       my $packet = $self->_parse_packet($raw_packet);
 3649       $packet->{pos_in_log} = $pos_in_log;
 3650       $packet->{raw_packet} = $raw_packet;
 3651
 3652       $args{stats}->{events_read}++ if $args{stats};
 3653
 3654       return $packet;
 3655    }
 3656
 3657    $args{oktorun}->(0) if $args{oktorun};
 3658    return;
 3659 }

これで無事に動いた。