線上應用，配置的數據庫連接數為50，正常情況是已經夠用了，但是有天發現50個連接全部被占滿，并且長時間無法恢復，重啟服務后會好一段時間。

1、問題現象

Druid獲取MySQL數據庫連接超時，超時時間設置的為60s

2019-09-23 15:38:24.627-|XNIO-3 task-80-|ERROR-|7fba6a1c917f42878b43f937df37e575-|10.123.18.241-|-|/api/v1/qimao/admin/distributor/add-|-|Java/1.8.0_181-|c.q.k.q.web.controller.admin.DistributorController-|method:addDistributor org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 10, maxActive 10, creating 0at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:289)at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:447)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:277)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)at com.qiyi.kpp.qimao.web.service.impl.DistributorServiceImpl$$EnhancerBySpringCGLIB$$e95f0879.addDistributor(<generated>)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController.addDistributor(DistributorController.java:174)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController$$FastClassBySpringCGLIB$$9c955533.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController$$EnhancerBySpringCGLIB$$100c45af.addDistributor(<generated>)at sun.reflect.GeneratedMethodAccessor210.invoke(Unknown Source).............at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)at io.undertow.server.Connectors.executeRootHandler(Connectors.java:211)at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:809)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at java.lang.Thread.run(Thread.java:745) Caused by: com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 10, maxActive 10, creating 0at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1512)at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1255)at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5007)at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:680)at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5003)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1233)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1225)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90)at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:246)... 100 common frames omitted

2、解決辦法

添加配置，當連接超過30秒鐘后會強制進行回收

<!-- 超過時間限制是否回收 --> druid.removeAbandoned=true <!-- 超時時間；單位為秒。 --> druid.removeAbandonedTimeout=30 <!-- 關閉abanded連接時輸出錯誤日志 --> druid.logAbandoned=true

最終重現了這個問題，打印日志如下

2019-09-27 16:07:21.369-|AsyncResolver-bootstrap-executor-0-|INFO-|-|-|-|-|-|-|c.n.d.shared.resolver.aws.ConfigClusterResolver-|Resolving eureka endpoints via configuration 2019-09-27 16:07:28.954-|Druid-ConnectionPool-Destroy-786728464-|ERROR-|-|-|-|-|-|-|com.alibaba.druid.pool.DruidDataSource-|abandon connection, owner thread: XNIO-3 task-862, connected at : 1569571561703, open stackTraceat java.lang.Thread.getStackTrace(Thread.java:1552)at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1313)at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5007)at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:680)at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:5003)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1233)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1225)at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:90)at org.springframework.jdbc.datasource.DataSourceTransactionManager.doBegin(DataSourceTransactionManager.java:246)at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:373)at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:447)at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:277)at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)at com.qiyi.kpp.qimao.web.service.impl.DistributorServiceImpl$$EnhancerBySpringCGLIB$$ec30275b.addDistributor(<generated>)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController.addDistributor(DistributorController.java:174)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController$$FastClassBySpringCGLIB$$9c955533.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:168)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)at com.qiyi.kpp.qimao.web.controller.admin.DistributorController$$EnhancerBySpringCGLIB$$34df12db.addDistributor(<generated>)

運行程序，當連接超過30秒鐘后會強制進行回收，并輸出異常日志。再根據異常日志分析（看看owner thread在干啥，為什么一直占據數據庫連接）即可

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