从MySql迁移:MariaDB服务器意外关闭客户端连接

Question

由于许可/商业使用原因,我们正在从MySql迁移到MariaDB.

我们已经成功地用MariaDB客户端jar替换了MySql连接器jar(第一次更改),现在尝试用MariaDB服务器替换MySql服务器而不更改数据文件.

我们所有的应用程序运行完美约8-12小时,之后我们看到以下异常:

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org.springframework.transaction.CannotCreateTransactionException: Could not open Hibernate Session for transaction; nested exception is org.hibernate.exception.JDBCConnectionException: Cannot open connection
Caused by:
org.hibernate.exception.JDBCConnectionException: Cannot open connection
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
        at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:426)
        at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
        at org.hibernate.jdbc.JDBCContext.connection(JDBCContext.java:119)
        at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57)
        at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1326)
        at org.springframework.orm.hibernate3.HibernateTransactionManager.doBegin(HibernateTransactionManager.java:494)
        at org.springframework.transaction.support.AbstractPlatformTransactionManager.getTransaction(AbstractPlatformTransactionManager.java:315)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.createTransactionIfNecessary(TransactionAspectSupport.java:257)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:102)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:209)
        at $Proxy4.getMessageCountByStatus(Unknown Source)
        at com.onmobile.cmfweb.monitoring.CmfMessagesMonitor.getMessageCounts(CmfMessagesMonitor.java:56)
        at sun.reflect.GeneratedMethodAccessor625.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.springframework.util.MethodInvoker.invoke(MethodInvoker.java:270)
        at com.onmobile.cmfshare.MethodInvockingBean.invoke(MethodInvockingBean.java:28)
        at org.springframework.scheduling.quartz.MethodInvokingJobDetailFactoryBean$MethodInvokingJob.executeInternal(MethodInvokingJobDetailFactoryBean.java:212)
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:79)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:203)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
Caused by: java.sql.SQLNonTransientConnectionException: Could not connect to localhost:3306: unexpected end of stream, read 0bytes from 4
        at org.mariadb.jdbc.internal.SQLExceptionMapper.get(SQLExceptionMapper.java:136)
        at org.mariadb.jdbc.internal.SQLExceptionMapper.throwException(SQLExceptionMapper.java:106)
        at org.mariadb.jdbc.Driver.connect(Driver.java:114)
        at org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)
        at org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)
        at org.apache.commons.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:840)
        at org.apache.commons.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:95)
        at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:544)
        at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
        at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:423)
        ... 21 more
Caused by: org.mariadb.jdbc.internal.common.QueryException: Could not connect to localhost:3306: unexpected end of stream, read 0bytes from 4
        at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:509)
        at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:669)
        at org.mariadb.jdbc.internal.mysql.MySQLProtocol.<init>(MySQLProtocol.java:264)
        at org.mariadb.jdbc.Driver.connect(Driver.java:110)
        ... 28 more
Caused by: java.io.EOFException: unexpected end of stream, read 0bytes from 4
        at org.mariadb.jdbc.internal.common.packet.buffer.ReadUtil.readFully(ReadUtil.java:84)
        at org.mariadb.jdbc.internal.common.packet.buffer.ReadUtil.readFully(ReadUtil.java:92)
        at org.mariadb.jdbc.internal.common.packet.RawPacket.nextPacket(RawPacket.java:77)
        at org.mariadb.jdbc.internal.common.packet.SyncPacketFetcher.getRawPacket(SyncPacketFetcher.java:67)
        at org.mariadb.jdbc.internal.mysql.MySQLProtocol.connect(MySQLProtocol.java:467)
        ... 31 more

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如果再次使用MySql服务器,则异常消失.

从我调试到目前为止,MariaDB服务器由于某种原因正在关闭客户端连接.我最初怀疑是空闲连接但我们正在使用像'testOnBorrow'这样的Hibernate配置,所以不应该这样.

任何人都可以帮助我们找出原因并帮助我们解决问题吗？我应该在MariaDB中进行任何特定配置吗？

我甚至通过增加MariaDB服务器中param'interactive_timeout'的值来运行我们的应用程序,但它没有帮助.

顺便说一句,我们正在使用Spring-Hibernate并使用Commons-pool jar汇集我们的连接.

任何形式的帮助将深表感谢.

Answer 1

由于参数组合不正确，我们最近遇到了同样的问题。此错误是由您的 Web 实例尝试使用不再有效的连接引起的。

这可以通过确保以下参数正确来解决：

1. 您为数据库连接配置了一个validationQuery。即validationQuery="SELECT 1"在 mariadb 的情况下，在服务器配置中。
2. 您已将 wait_timeout 设置为合理的值。8 小时 keepAlive 似乎有点乐观，我们现在正在使用wait_timeout=180
3. 确保validationInterval（您也可以在服务器配置中设置（在tomcat 设置的情况下为server.xml））设置为低于wait_timeout 值的值。在一种情况下，我将 wait_timeout 减少到 15 秒，validationInterval 值高于该值，这导致错误有时仍然出现。现在它被设置为validationInterval=60，结合wait_timeout=180应该及时捕获任何断开的连接。

Answer 2

您可以尝试增加“wait_timeout”而不是“interactive_timeout”。8-12 小时直到错误与 wait_timeout 的默认值（10 小时）非常相关。JDBC 驱动程序在连接时不会设置交互式客户端标志，因此更改为“interactive_timeout”可能无效。我还回复了 Maria KB 的交叉帖子；）