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set @prior_lock_wait_timeout = @@rocksdb_lock_wait_timeout;
set @prior_deadlock_detect = @@rocksdb_deadlock_detect;
set @prior_max_latest_deadlocks = @@rocksdb_max_latest_deadlocks;
set global rocksdb_deadlock_detect = on;
set global rocksdb_lock_wait_timeout = 10000;
# Clears deadlock buffer of any prior deadlocks.
set global rocksdb_max_latest_deadlocks = 0;
set global rocksdb_max_latest_deadlocks = @prior_max_latest_deadlocks;
connect con1,localhost,root,,;
connect con2,localhost,root,,;
connect con3,localhost,root,,;
connection default;
show create table information_schema.rocksdb_deadlock;
Table Create Table
ROCKSDB_DEADLOCK CREATE TEMPORARY TABLE `ROCKSDB_DEADLOCK` (
`DEADLOCK_ID` bigint(21) NOT NULL,
`TIMESTAMP` bigint(21) NOT NULL,
`TRANSACTION_ID` bigint(21) NOT NULL,
`CF_NAME` varchar(193) NOT NULL,
`WAITING_KEY` varchar(513) NOT NULL,
`LOCK_TYPE` varchar(193) NOT NULL,
`INDEX_NAME` varchar(193) NOT NULL,
`TABLE_NAME` varchar(193) NOT NULL,
`ROLLED_BACK` bigint(21) NOT NULL
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb3
create table t (i int primary key) engine=rocksdb;
insert into t values (1), (2), (3);
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
Deadlock #1
connection con1;
begin;
select * from t where i=1 for update;
i
1
connection con2;
begin;
select * from t where i=2 for update;
i
2
connection con1;
select * from t where i=2 for update;
connection con2;
select * from t where i=1 for update;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
rollback;
connection con1;
i
2
rollback;
connection default;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
Deadlock #2
connection con1;
begin;
select * from t where i=1 for update;
i
1
connection con2;
begin;
select * from t where i=2 for update;
i
2
connection con1;
select * from t where i=2 for update;
connection con2;
select * from t where i=1 for update;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
rollback;
connection con1;
i
2
rollback;
connection default;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
set global rocksdb_max_latest_deadlocks = 10;
Deadlock #3
connection con1;
begin;
select * from t where i=1 for update;
i
1
connection con2;
begin;
select * from t where i=2 for update;
i
2
connection con1;
select * from t where i=2 for update;
connection con2;
select * from t where i=1 for update;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
rollback;
connection con1;
i
2
rollback;
connection default;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
set global rocksdb_max_latest_deadlocks = 1;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 1
connection con3;
set rocksdb_deadlock_detect_depth = 2;
Deadlock #4
connection con1;
begin;
select * from t where i=1 for update;
i
1
connection con2;
begin;
select * from t where i=2 for update;
i
2
connection con3;
begin;
select * from t where i=3 for update;
i
3
connection con1;
select * from t where i=2 for update;
connection con2;
select * from t where i=3 for update;
connection con3;
select * from t where i=1 for update;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
rollback;
connection con2;
i
3
rollback;
connection con1;
i
2
rollback;
connection default;
set global rocksdb_max_latest_deadlocks = 5;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
Deadlock #5
connection con1;
begin;
select * from t where i=1 for update;
i
1
connection con2;
begin;
select * from t where i=2 for update;
i
2
connection con3;
begin;
select * from t where i=3 lock in share mode;
i
3
connection con1;
select * from t where i=100 for update;
i
select * from t where i=101 for update;
i
select * from t where i=2 for update;
connection con2;
select * from t where i=3 lock in share mode;
i
3
select * from t where i=200 for update;
i
select * from t where i=201 for update;
i
select * from t where i=1 lock in share mode;
ERROR 40001: Deadlock found when trying to get lock; try restarting transaction
rollback;
connection con1;
i
2
rollback;
connection con3;
rollback;
connection default;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE PRIMARY test.t 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY SHARED PRIMARY test.t 1
disconnect con1;
disconnect con2;
disconnect con3;
set global rocksdb_lock_wait_timeout = @prior_lock_wait_timeout;
set global rocksdb_deadlock_detect = @prior_deadlock_detect;
drop table t;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY EXCLUSIVE INDEX_NAME TABLE_NAME 0
DEADLOCK_ID TIMESTAMP TRANSACTION_ID default WAITING_KEY SHARED INDEX_NAME TABLE_NAME 1
set global rocksdb_max_latest_deadlocks = 0;
# Clears deadlock buffer of any existent deadlocks.
set global rocksdb_max_latest_deadlocks = @prior_max_latest_deadlocks;
select * from information_schema.rocksdb_deadlock;
DEADLOCK_ID TIMESTAMP TRANSACTION_ID CF_NAME WAITING_KEY LOCK_TYPE INDEX_NAME TABLE_NAME ROLLED_BACK
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