Gearman::Starter 0.03でジョブ失敗したときにアレコレが出来るようになったようである！

use Gearman::Starter;
my $gearman_starter = Gearman::Starter->new(
    server                 => ['127.0.0.1:7003'],
    max_workers            => 3,
    max_requests_per_child => 10,
    module                 => ['MyWorker::Job'],
    scoreboard_dir         => $scoreboard_dir,         # optional
    port                   => 9999,                    # optional
    Reload                 => ['lib/MyWorker/Job.pm'], # optional
    on_fail                => sub { ... },             # optional
);
$gearman_starter->run;

マージありがとうございます。
https://metacpan.org/pod/Gearman::Starter
https://github.com/tokuhirom/gearman-starter.pl