dbcp 连接池不合理的锁导致连接耗尽解决方案
应用报错,表象来看是连接池爆满了。
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool exhausted at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:241) ~[spring-jdbc-3.2.2.RELEASE.jar:3.2.2.RELEASE] at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) [dubbo-2.5.3.jar:2.5.3] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_33] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_33] at java.lang.Thread.run(Thread.java:662) [na:1.6.0_33] Caused by: org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, pool exhausted at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:103) ~[commons-dbcp.jar:1.2.1] at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540) ~[commons-dbcp.jar:1.2.1] at com.eshore.crmpub.jdbc.datasource.MultiDataSource.getConnection(MultiDataSource.java:74) ~[crmpub-jdbc-1.0.jar:1.0] at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:203) ~[spring-jdbc-3.2.2.RELEASE.jar:3.2.2.RELEASE] ... 32 common frames omitted Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1174) ~[commons-pool-1.6.jar:1.6] at org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:74) ~[commons-dbcp.jar:1.2.1] at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95) ~[commons-dbcp.jar:1.2.1] ... 35 common frames omitted
应用堆栈，几十条线程都阻塞到dbcp池的PoolableConnectionFactory.makeObject方法了，此方法在等待0x0000000709a638a0对象锁，但0x0000000709a638a0对象一直被其中一条线程执行PoolableConnectionFactory.makeObject时锁了，而且这条线程获取到锁后还阻塞住了，所以导致后面几十条线程都BLOCKED了。
"DubboServerHandler-132.121.95.136:28101-thread-300" daemon prio=10 tid=0x00007f02b4136800 nid=0x4954 waiting for monitor entry [0x00007f0286018000] java.lang.Thread.State: BLOCKED (on object monitor) at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290) - waiting to lock <0x0000000709a638a0> (a org.apache.commons.dbcp.PoolableConnectionFactory) at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:1188) at org.apache.commons.dbcp.AbandonedObjectPool.borrowObject(AbandonedObjectPool.java:74) at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95) at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540) at com.eshore.crmpub.jdbc.datasource.MultiDataSource.getConnection(MultiDataSource.java:74) at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:203) at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:372) at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:417) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:255) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161) at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:80) at com.eshore.crm.service.common.pub.aspect.DataSourceRouteAspect.around(DataSourceRouteAspect.java:74) at sun.reflect.GeneratedMethodAccessor253.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:621) at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:610) at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:65) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:161) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:91) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:631) at com.eshore.crm.service.sysmgr.sca.impl.SysMgrServiceImpl$$EnhancerByCGLIB$$bfd71326.qryBulletinList(<generated>) at com.alibaba.dubbo.common.bytecode.Wrapper101.invokeMethod(Wrapper101.java) at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:46) at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:72) at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:53) at com.eshore.crmpub.sca.dubbo.filter.BaseFilter.invoke(BaseFilter.java:90) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:91) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:108) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:84) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:170) at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:52) at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:82) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) at java.lang.Thread.run(Thread.java:662) Locked ownable synchronizers: - <0x000000070a120f00> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)