try (ExecutorService executorService = Executors.newFixedThreadPool(threadCount)) {
    sendMultipleRequests(executorService, members, ticket);
}

private void sendMultipleRequests(ExecutorService executorService, List<Member> members, Ticket... tickets) {
    AtomicInteger succeedRequestCount = new AtomicInteger(0);
    AtomicInteger failRequestCount = new AtomicInteger(0);

    for (Member member : members) {
        for (int i = 0; i < MemberTicket.MEMBER_TICKET_COUNT_MAX; i++) {
            executorService.submit(() -> {
                try {
                    memberTicketService.issue(member.getId(), getRandomTicket(tickets).getId());
                    succeedRequestCount.incrementAndGet();
                } catch (Exception e) {
                    log.error("멤버 티켓 발행 중 오류 발생", e);
                    failRequestCount.incrementAndGet();
                }
            });
        }
    }

    log.info("성공한 요청 수 : {}", succeedRequestCount.get());
    log.info("실패한 요청 수 : {}", failRequestCount.get());
}