使用druid连接池的超时回收机制排查连接泄露问题

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andot 3月 01, 2018
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在工程中使用了druid连接池,运行一段时间后系统出现异常:

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Caused by: org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60009, active 50  
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80)
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:280)
... 64 more
Caused by: com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 60000, active 50
at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1071)
at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:898)
at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4544)

mysql数据库最大连接数设置为500,使用客户端能正常连接。连接数被未被占满。

分析原因应该是程序中有地方连接未关闭造成的。那如何来定呢?使用druid连接池的超时回收机制,在配置中增加以下内容:

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<!-- 超过时间限制是否回收 -->  
<property name="removeAbandoned" value="true" />
<!-- 超时时间;单位为秒。180秒=3分钟 -->
<property name="removeAbandonedTimeout" value="180" />
<!-- 关闭abanded连接时输出错误日志 -->
<property name="logAbandoned" value="true" />

运行程序,当连接超过3分钟后会强制进行回收,并输出异常日志。

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2014-10-13 16:02:28,919 ERROR [com.alibaba.druid.pool.DruidDataSource] - <abandon connection, open stackTrace  
at java.lang.Thread.getStackTrace(Thread.java:1567)
at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:995)
at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4544)
at com.alibaba.druid.filter.stat.StatFilter.dataSource_getConnection(StatFilter.java:661)
at com.alibaba.druid.filter.FilterChainImpl.dataSource_connect(FilterChainImpl.java:4540)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:919)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:911)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:98)

at cn.org.xxx.xxx.xxx.PaginationInterceptor.intercept(PaginationInterceptor.java:96)

at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:60)
at com.sun.proxy.$Proxy59.query(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)

很清楚地看到是在哪里打开的连接未关闭一直在占有。

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