我有多个线程使用同步作业启动器启动作业。当并发创建作业实例时，我得到以下异常：
Exception in thread "pool-1-thread-1" org.springframework.dao.DataAccessResourceFailureException: Could not obtain last_insert_id(); nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.springframework.jdbc.support.incrementer.MySQLMaxValueIncrementer.getNextKey(MySQLMaxValueIncrementer.java:118)
at org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer.nextLongValue(AbstractDataFieldMaxValueIncrementer.java:128)
at org.springframework.batch.core.repository.dao.JdbcJobInstanceDao.createJobInstance(JdbcJobInstanceDao.java:109)
at org.springframework.batch.core.repository.support.SimpleJobRepository.createJobExecution(SimpleJobRepository.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.batch.core.repository.support.AbstractJobRepositoryFactoryBean$1.invoke(AbstractJobRepositoryFactoryBean.java:172)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy36.createJobExecution(Unknown Source)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:125)
at com.example.JobTask.run(JobTask.java:122)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
at com.mysql.jdbc.Util.getInstance(Util.java:372)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2531)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1618)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1549)
at com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:436)
at org.springframework.jdbc.support.incrementer.MySQLMaxValueIncrementer.getNextKey(MySQLMaxValueIncrementer.java:102)
... 23 more
Exception in thread "pool-2-thread-1" org.springframework.dao.DataAccessResourceFailureException: Could not obtain last_insert_id(); nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.springframework.jdbc.support.incrementer.MySQLMaxValueIncrementer.getNextKey(MySQLMaxValueIncrementer.java:118)
at org.springframework.jdbc.support.incrementer.AbstractDataFieldMaxValueIncrementer.nextLongValue(AbstractDataFieldMaxValueIncrementer.java:128)
at org.springframework.batch.core.repository.dao.JdbcJobInstanceDao.createJobInstance(JdbcJobInstanceDao.java:109)
at org.springframework.batch.core.repository.support.SimpleJobRepository.createJobExecution(SimpleJobRepository.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.batch.core.repository.support.AbstractJobRepositoryFactoryBean$1.invoke(AbstractJobRepositoryFactoryBean.java:172)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy36.createJobExecution(Unknown Source)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:125)
at com.example.JobTask.run(JobTask.java:122)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
at com.mysql.jdbc.Util.getInstance(Util.java:372)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2531)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1618)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1549)
at com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:436)
at org.springframework.jdbc.support.incrementer.MySQLMaxValueIncrementer.getNextKey(MySQLMaxValueIncrementer.java:102)
... 23 more
如果有帮助，这是SHOW ENGINE INNODB STATUS命令的输出：
=====================================
2015-11-10 13:28:12 7fcb28845700 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 54 seconds
-----------------
BACKGROUND THREAD
-----------------
srv_master_thread loops: 635 srv_active, 0 srv_shutdown, 52429 srv_idle
srv_master_thread log flush and writes: 53064
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 308
OS WAIT ARRAY INFO: signal count 299
Mutex spin waits 286, rounds 1715, OS waits 43
RW-shared spins 264, rounds 7805, OS waits 258
RW-excl spins 23, rounds 456, OS waits 5
Spin rounds per wait: 6.00 mutex, 29.56 RW-shared, 19.83 RW-excl
------------------------
LATEST DETECTED DEADLOCK
------------------------
2015-11-10 10:53:26 7fcb28539700
*** (1) TRANSACTION:
TRANSACTION 713122, ACTIVE 1 sec inserting
mysql tables in use 1, locked 1
LOCK WAIT 6 lock struct(s), heap size 1184, 4 row lock(s), undo log entries 2
MySQL thread id 59, OS thread handle 0x7fcb2867e700, query id 35893 92.240.15.2 root update
INSERT into BATCH_JOB_INSTANCE(JOB_INSTANCE_ID, JOB_NAME, JOB_KEY, VERSION) values (1, 'CSV', 'd52c9dc2e62cf24ec305728b7a2c5c0a', 0)
*** (1) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 135 page no 4 n bits 72 index `JOB_INST_UN` of table `spring_batch`.`BATCH_JOB_INSTANCE` trx id 713122 lock_mode X insert intention waiting
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;
*** (2) TRANSACTION:
TRANSACTION 713124, ACTIVE 0 sec starting index read, thread declared inside InnoDB 5000
mysql tables in use 1, locked 1
4 lock struct(s), heap size 1184, 2 row lock(s)
MySQL thread id 68, OS thread handle 0x7fcb28539700, query id 35895 92.240.15.2 root updating
update BATCH_JOB_SEQ set ID = last_insert_id(ID + 1)
*** (2) HOLDS THE LOCK(S):
RECORD LOCKS space id 135 page no 4 n bits 72 index `JOB_INST_UN` of table `spring_batch`.`BATCH_JOB_INSTANCE` trx id 713124 lock mode S
Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0
0: len 8; hex 73757072656d756d; asc supremum;;
*** (2) WAITING FOR THIS LOCK TO BE GRANTED:
RECORD LOCKS space id 143 page no 3 n bits 72 index `UNIQUE_KEY_UN` of table `spring_batch`.`BATCH_JOB_SEQ` trx id 713124 lock_mode X waiting
Record lock, heap no 2 PHYSICAL RECORD: n_fields 4; compact format; info bits 0
0: len 1; hex 30; asc 0;;
1: len 6; hex 0000000ae1a2; asc ;;
2: len 7; hex 3e0000019b2308; asc > # ;;
3: len 8; hex 8000000000000001; asc ;;
*** WE ROLL BACK TRANSACTION (2)
------------
TRANSACTIONS
------------
Trx id counter 713138
Purge done for trx's n:o < 713137 undo n:o < 0 state: running but idle
History list length 1305
LIST OF TRANSACTIONS FOR EACH SESSION:
---TRANSACTION 0, not started
MySQL thread id 71, OS thread handle 0x7fcb28845700, query id 35985 92.240.15.2 root init
SHOW ENGINE INNODB STATUS
---TRANSACTION 713137, not started
MySQL thread id 70, OS thread handle 0x7fcb28782700, query id 35982 92.240.15.2 root cleaning up
--------
FILE I/O
--------
I/O thread 0 state: waiting for completed aio requests (insert buffer thread)
I/O thread 1 state: waiting for completed aio requests (log thread)
I/O thread 2 state: waiting for completed aio requests (read thread)
I/O thread 3 state: waiting for completed aio requests (read thread)
I/O thread 4 state: waiting for completed aio requests (read thread)
I/O thread 5 state: waiting for completed aio requests (read thread)
I/O thread 6 state: waiting for completed aio requests (write thread)
I/O thread 7 state: waiting for completed aio requests (write thread)
I/O thread 8 state: waiting for completed aio requests (write thread)
I/O thread 9 state: waiting for completed aio requests (write thread)
Pending normal aio reads: 0 [0, 0, 0, 0] , aio writes: 0 [0, 0, 0, 0] ,
ibuf aio reads: 0, log i/o's: 0, sync i/o's: 0
Pending flushes (fsync) log: 0; buffer pool: 0
466 OS file reads, 8503 OS file writes, 5353 OS fsyncs
0.00 reads/s, 0 avg bytes/read, 0.00 writes/s, 0.00 fsyncs/s
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 0, seg size 2, 0 merges
merged operations:
insert 0, delete mark 0, delete 0
discarded operations:
insert 0, delete mark 0, delete 0
Hash table size 276671, node heap has 1 buffer(s)
0.00 hash searches/s, 0.00 non-hash searches/s
---
LOG
---
Log sequence number 514559278
Log flushed up to 514559278
Pages flushed up to 514559278
Last checkpoint at 514559278
0 pending log writes, 0 pending chkp writes
4480 log i/o's done, 0.00 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 137363456; in additional pool allocated 0
Dictionary memory allocated 102572
Buffer pool size 8191
Free buffers 7401
Database pages 789
Old database pages 271
Modified db pages 0
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages made young 0, not young 0
0.00 youngs/s, 0.00 non-youngs/s
Pages read 441, created 348, written 3623
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
No buffer pool page gets since the last printout
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 789, unzip_LRU len: 0
I/O sum[0]:cur[0], unzip sum[0]:cur[0]
--------------
ROW OPERATIONS
--------------
0 queries inside InnoDB, 0 queries in queue
0 read views open inside InnoDB
Main thread process no. 2535, id 140510486161152, state: sleeping
Number of rows inserted 574, updated 5893, deleted 0, read 12358
0.00 inserts/s, 0.00 updates/s, 0.00 deletes/s, 0.00 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================
知道为什么会这样吗？
我使用MySQL v5.6.26。
谢谢， 迈克尔
修改
这是我的工作配置：
addStep(new StepBuilder(partitioningStepName)
.tasklet(partitionerTasklet)
.repository(jobRepository)
.transactionManager(txManager)
.build());
addStep(new StepBuilder(processingStepName)
.partitioner("partition", partitioner)
.taskExecutor(new SimpleAsyncTaskExecutor())
.step(new StepBuilder(processingStepName)
.<ItemWrapper<Request>, ItemWrapper<Request>>chunk(1000)
.reader(commonReader)
.writer(writer)
.repository(jobRepository)
.transactionManager(txManager)
.listener(failureListener)
.build())
.repository(jobRepository)
.transactionManager(txManager)
.build());
addStep(new StepBuilder(mergingStepName)
.tasklet(mergerTasklet)
.repository(jobRepository)
.transactionManager(txManager)
.build());
我试图在启动作业的行上设置一个断点：
jobExecution = jobLauncher.run(job, jobParameters);
我可以看到我的线程都停在这一行。然后，我让它们一个接一个地运行，在启动之间等待一段时间，并且没有按预期发生死锁。根据MySQL日志，看起来第一个事务已经获得了下一个ID并且正在插入一个作业实例。但是，第二个事务在获取下一个ID时被卡住了。根据MySQLMaxValueIncrementer类的javadoc，MyISAM引擎应该用于序列表（参见我创建的issue）。因此，我尝试使用MyISAM而不是InnoDB，现在我仍然遇到死锁，但仅限于INSERT部分。因此，例外情况如下：
Exception in thread "pool-1-thread-1"
org.springframework.dao.DeadlockLoserDataAccessException: PreparedStatementCallback; SQL [INSERT into BATCH_JOB_INSTANCE(JOB_INSTANCE_ID, JOB_NAME, JOB_KEY, VERSION) values (?, ?, ?, ?)]; Deadlock found when trying to get lock; try restarting transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:263)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:660)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:970)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:975)
at org.springframework.batch.core.repository.dao.JdbcJobInstanceDao.createJobInstance(JdbcJobInstanceDao.java:116)
at org.springframework.batch.core.repository.support.SimpleJobRepository.createJobExecution(SimpleJobRepository.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.batch.core.repository.support.AbstractJobRepositoryFactoryBean$1.invoke(AbstractJobRepositoryFactoryBean.java:172)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy36.createJobExecution(Unknown Source)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:125)
at com.example.JobTask.run(JobTask.java:122)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
at com.mysql.jdbc.Util.getInstance(Util.java:372)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2535)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1911)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2145)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2081)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2066)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:1449)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:916)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:644)
... 25 more
Exception in thread "pool-2-thread-1" org.springframework.dao.DeadlockLoserDataAccessException: PreparedStatementCallback; SQL [INSERT into BATCH_JOB_INSTANCE(JOB_INSTANCE_ID, JOB_NAME, JOB_KEY, VERSION) values (?, ?, ?, ?)]; Deadlock found when trying to get lock; try restarting transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:263)
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:660)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:970)
at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:975)
at org.springframework.batch.core.repository.dao.JdbcJobInstanceDao.createJobInstance(JdbcJobInstanceDao.java:116)
at org.springframework.batch.core.repository.support.SimpleJobRepository.createJobExecution(SimpleJobRepository.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:281)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.batch.core.repository.support.AbstractJobRepositoryFactoryBean$1.invoke(AbstractJobRepositoryFactoryBean.java:172)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
at com.sun.proxy.$Proxy36.createJobExecution(Unknown Source)
at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:125)
at com.example.JobTask.run(JobTask.java:122)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
at com.mysql.jdbc.Util.getInstance(Util.java:372)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3835)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3771)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2535)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1911)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2145)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2081)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2066)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeUpdate(NewProxyPreparedStatement.java:1449)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:916)
at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:909)
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:644)
... 25 more
现在，查看MySQL日志，所有涉及的锁都在同一个表上。我不明白为什么同一个INSERT在同一个表上（并且只涉及一个表）可能导致死锁。
更多信息，死锁与JOB_INSTANCE表上存在唯一约束有关。在INSERT之前，MySQL锁定索引中的记录，并且在并发事务之间发生死锁。
答案 0 :(得分：2)
问题来自共享锁。默认情况下，createJobExecution方法在具有可序列化隔离级别的事务中执行。使用此隔离级别时，InnoDB会将所有普通SELECT语句隐式转换为SELECT ... LOCK IN SHARE MODE。因此，由于对实例表的查询，JOB_INST_UN被锁定共享。然后，在插入作业实例时，需要对JOB_INST_UN进行独占锁定。如果此唯一索引被另一个事务共享锁定，则会出现死锁。
答案 1 :(得分：0)
可能的条件：
1个线程正在访问导致表锁定的表中的记录，然后另一个1正在访问该表但锁定未被解除时