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- MySQL 버전 : 5.7
- 스토리지 엔진 : 이노
- 이가 (nodejs에서) 카드 게임 상황에 넣을 수 있습니다. 이 경우 9 명의 선수 테이블 게임. 그리고 각 플레이어는 4 테이블 게임을 동시에 할 수 있습니다.
최근 1K 동시 사용자의 분당 1에서 5와 같은 재발 성 교착 상태가 발생했습니다. 아래 쿼리는 분당 평균 2 회 및 사용자 당 평균 2 회 호출됩니다.MySQL의 INSERT
- 사용자가 게임하기를 원합니다.
- 서버는 항상 1 위의 테이블 게임에서 첫 번째 빈 자리 (좌석)를 찾습니다.
이 쿼리는 2 명 이상의 다른 플레이어 (또는 동일한 플레이어 2+ 회)가 삽입 쿼리를 실행할 때 가능한 경쟁 조건을 처리하기 위해 작성 되었기 때문에 해결 방법을 모르겠습니다.
물론 고유 키를 사용하여 경쟁 조건을 처리 할 수 있지만 100 개 이상의 사용자가 자유로운 장소를 검색 할 때 관리하기가 어렵습니다. 가능하면 dupplicate 키로 91+ 거부를 유발합니다.
LATEST DETECTED DEADLOCK
------------------------
*** (1) TRANSACTION:
TRANSACTION 100539324, ACTIVE 0 sec inserting
mysql tables in use 5, locked 5
LOCK WAIT 23 lock struct(s), heap size 3520, 111 row lock(s), undo log entries 1
MySQL thread id 6782, OS thread handle 2460, query id 138188765 localhost 127.0.0.1 root Creating sort index
INSERT INTO app_tables_players (user_id, game_id, seat_number, username, state, folded) SELECT 597, a.id, b.id AS seat_number, 'some_username', 'temp', false FROM (SELECT id FROM app_tables_games WHERE table_id = 6 AND seats_total > seats_taken AND id NOT IN (SELECT game_id FROM app_users_state WHERE user_id = 597)) AS a, `app_temp_players_9` AS b WHERE b.id NOT IN (SELECT seat_number FROM app_tables_players WHERE game_id = a.id) ORDER BY a.id ASC LIMIT 1
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 75 page no 51 n bits 1120 index seat_number_game_id of table `nodejs`.`app_tables_players` trx id 100539324 lock_mode X locks gap before rec insert intention waiting
Record lock, heap no 964 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d8f6; asc ;;
2: len 4; hex 006b437b; asc kC{;;
*** (2) TRANSACTION:
TRANSACTION 100539325, ACTIVE 0 sec setting auto-inc lock, thread declared inside InnoDB 4743
mysql tables in use 5, locked 5
22 lock struct(s), heap size 3520, 151 row lock(s)
MySQL thread id 6702, OS thread handle 11428, query id 138188764 localhost 127.0.0.1 root Creating sort index
INSERT INTO app_tables_players (user_id, game_id, seat_number, username, state, folded) SELECT 613, a.id, b.id AS seat_number, 'some_username2', 'tmp', false FROM (SELECT id FROM app_tables_games WHERE table_id = 14 AND seats_total > seats_taken AND id NOT IN (SELECT game_id FROM app_users_state WHERE user_id = 613)) AS a, `app_temp_players_9` AS b WHERE b.id NOT IN (SELECT seat_number FROM app_tables_players WHERE game_id = a.id) ORDER BY a.id ASC LIMIT 1
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 75 page no 51 n bits 1120 index seat_number_game_id of table `nodejs`.`app_tables_players` trx id 100539325 lock mode S locks gap before rec
Record lock, heap no 18 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 06; asc ;;
1: len 4; hex 0008d6e4; asc ;;
2: len 4; hex 006b5a47; asc kZG;;
Record lock, heap no 97 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d97e; asc ~;;
2: len 4; hex 006b5d1e; asc k] ;;
Record lock, heap no 160 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 05; asc ;;
1: len 4; hex 0008d93e; asc >;;
2: len 4; hex 006b4cb3; asc kL ;;
Record lock, heap no 181 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d92f; asc /;;
2: len 4; hex 006b5c0b; asc k\ ;;
Record lock, heap no 267 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d9b2; asc ;;
2: len 4; hex 006b5b9a; asc k[ ;;
Record lock, heap no 272 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 05; asc ;;
1: len 4; hex 0008d999; asc ;;
2: len 4; hex 006b5d43; asc k]C;;
Record lock, heap no 307 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008da33; asc 3;;
2: len 4; hex 006b6182; asc ka ;;
Record lock, heap no 346 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008da38; asc 8;;
2: len 4; hex 006b5fbd; asc k_ ;;
Record lock, heap no 530 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 05; asc ;;
1: len 4; hex 0008d9b2; asc ;;
2: len 4; hex 006b544e; asc kTN;;
Record lock, heap no 556 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 05; asc ;;
1: len 4; hex 0008d97e; asc ~;;
2: len 4; hex 006b62f3; asc kb ;;
Record lock, heap no 629 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d999; asc ;;
2: len 4; hex 006b5f41; asc k_A;;
Record lock, heap no 804 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 05; asc ;;
1: len 4; hex 0008da33; asc 3;;
2: len 4; hex 006b60bc; asc k` ;;
Record lock, heap no 906 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d93e; asc >;;
2: len 4; hex 006b4988; asc kI ;;
Record lock, heap no 962 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d928; asc (;;
2: len 4; hex 006b5b03; asc k[ ;;
Record lock, heap no 964 PHYSICAL RECORD: n_fields 3; compact format; info bits 0
0: len 1; hex 04; asc ;;
1: len 4; hex 0008d8f6; asc ;;
2: len 4; hex 006b437b; asc kC{;;
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
TABLE LOCK table `nodejs`.`app_tables_players` trx id 100539325 lock mode AUTO-INC waiting
*** WE ROLL BACK TRANSACTION (2)
쿼리 발생시킨 문제 :
INSERT INTO app_tables_players
(user_id,
game_id,
seat_number)
SELECT
597,
a.id,
b.id AS seat_number
FROM
(SELECT id
FROM
app_tables_games
WHERE
table_id = 14
AND seats_total > seats_taken
AND id NOT IN (
SELECT game_id
FROM app_users_state
WHERE user_id = 597
)
) AS a,
app_temp_players_9 AS b
WHERE
b.id NOT IN (
SELECT seat_number
FROM app_tables_players
WHERE game_id = a.id
)
ORDER BY a.id ASC
LIMIT 1;
- 설명 쿼리 :
,748,194,
1, INSERT, app_tables_players, , ALL, , , , , , ,
1, PRIMARY, app_tables_games, , ref, table_id,table_id_seats_taken_seats_total, table_id_seats_taken_seats_total, 4, const, 24, 33.33, Using where; Using index; Using temporary; Using filesort
1, PRIMARY, b, , index, , id, 1, , 9, 100.00, Using where; Using index; Using join buffer (Block Nested Loop)
4, DEPENDENT SUBQUERY, app_tables_players, , index_subquery, seat_number_game_id,game_id_user_id,game_id,seat_number,game_id_state, seat_number_game_id, 6, func,func, 2, 100.00, Using where; Using index
3, SUBQUERY, app_users_state, , ref, game_id_user_id,user_id,game_id, user_id, 4, const, 4, 100.00,
- 바이올린 :,691,363 (210) http://sqlfiddle.com/#!9/fe63f7
참고 : 때때로 교착 상태가 위의 쿼리 발생 :이 2-3 다른 유형이었다 또는 내가 본이 응용 프로그램에 직면 모든 교착 상태에 대해 좀 더 연구 한 후
DELETE FROM app_users_states WHERE game_id = some_id AND user_id = some_id