dbcp 連接池不合理的鎖導致連接耗盡解決方案

應用報錯,表象來看是連接池爆滿了。

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 omittedCaused 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

應用堆棧，幾十條線程都阻塞到dbcp池的PoolableConnectionFactory.makeObject方法了，此方法在等待0x0000000709a638a0對象鎖，但0x0000000709a638a0對象一直被其中一條線程執行PoolableConnectionFactory.makeObject時鎖了，而且這條線程獲取到鎖后還阻塞住了，所以導致后面幾十條線程都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)