在飞路上连接超时

时间：2012-09-09 12:44:44

标签： mysql timeout migration version flyway

我正在使用flyway 1.5和mysql Ver 14.14 Distrib 5.1.52, for unknown-linux-gnu (x86_64) using readline 5.1

我写了以下迁移：

alter table table1 add column col_11 blob;
alter table table1 add column col_12 varchar(255) DEFAULT NULL;

alter table table2 add column col_21 blob;
alter table table2 add column col_22 varchar(255) DEFAULT NULL;

table1较小而table2有283,018行。

迁移成功（列已添加到table1和table2），但版本更新失败（我得到com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.）。

我的my.cnf文件包含下一行wait_timeout=30，我认为发生的事情是将这两列添加到table2所花费的时间超过wait_timout - 哪个“失败”迁移 - 现在我遇到了这种情况：迁移成功但版本没有更新。但后来我运行了这个SQL查询：

show variables like "%timeout%";

得到了这个：

+----------------------------+-------+
| Variable_name              | Value |
+----------------------------+-------+
| connect_timeout            | 10    |
| delayed_insert_timeout     | 300   |
| innodb_lock_wait_timeout   | 50    |
| innodb_rollback_on_timeout | OFF   |
| interactive_timeout        | 28800 |
| net_read_timeout           | 30    |
| net_write_timeout          | 60    |
| slave_net_timeout          | 3600  |
| table_lock_wait_timeout    | 50    |
| wait_timeout               | 28800 |
+----------------------------+-------+

这表明wait_timeout约为8小时......

所以我的问题是为什么会出现连接超时？

主要是 - 我该如何解决？

修改 应用程序和数据库都在同一台机器上。

这是完整的堆栈跟踪：

Current schema version: 12.9.3
Migrating to version 12.9.3.1

Error while extracting database product name - falling back to empty error codes
org.springframework.jdbc.support.MetaDataAccessException: Error while extracting DatabaseMetaData; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:296)
    at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:320)
    at org.springframework.jdbc.support.SQLErrorCodesFactory.getErrorCodes(SQLErrorCodesFactory.java:216)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.setDataSource(SQLErrorCodeSQLExceptionTranslator.java:140)
    at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.<init>(SQLErrorCodeSQLExceptionTranslator.java:103)
    at org.springframework.jdbc.support.JdbcAccessor.getExceptionTranslator(JdbcAccessor.java:99)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:407)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:522)
    at com.googlecode.flyway.core.metadatatable.MetaDataTable.insert(MetaDataTable.java:149)
    at com.googlecode.flyway.core.migration.DbMigrator.applyMigration(DbMigrator.java:248)
    at com.googlecode.flyway.core.migration.DbMigrator$1.doInTransaction(DbMigrator.java:148)
    at com.googlecode.flyway.core.migration.DbMigrator$1.doInTransaction(DbMigrator.java:114)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
    at com.googlecode.flyway.core.migration.DbMigrator.migrate(DbMigrator.java:113)
    at com.googlecode.flyway.core.Flyway.migrate(Flyway.java:619)
    at com.googlecode.flyway.commandline.Main.main(Main.java:79)
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.Util.getInstance(Util.java:386)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1013)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:987)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:982)
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:927)
    at com.mysql.jdbc.ConnectionImpl.throwConnectionClosedException(ConnectionImpl.java:1205)
    at com.mysql.jdbc.ConnectionImpl.checkClosed(ConnectionImpl.java:1197)
    at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:3061)
    at com.mysql.jdbc.ConnectionImpl.getMetaData(ConnectionImpl.java:3056)
    at org.springfra
mework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:285)
    ... 15 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 654,699 milliseconds ago.  The last packet sent successfully to the server was 17 milliseconds ago.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3102)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2618)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1749)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1666)
    at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:512)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:396)
    ... 9 more
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2552)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3002)
    ... 18 more
Application exception overridden by rollback exception
org.springframework.dao.RecoverableDataAccessException: StatementCallback; SQL [UPDATE schema_version SET current_version=0]; Communications link failure
The last packet successfully received from the server was 654,699 milliseconds ago.  The last packet sent successfully to the server was 17 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 654,699 milliseconds ago.  The last packet sent successfully to the server was 17 milliseconds ago.
    at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:97)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:407)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:522)
    at com.googlecode.flyway.core.metadatatable.MetaDataTable.insert(MetaDataTable.java:149)
    at com.googlecode.flyway.core.migration.DbMigrator.applyMigration(DbMigrator.java:248)
    at com.googlecode.flyway.core.migration.DbMigrator$1.doInTransaction(DbMigrator.java:148)
    at com.googlecode.flyway.core.migration.DbMigrator$1.doInTransaction(DbMigrator.java:114)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
    at com.googlecode.flyway.core.migration.DbMigrator.migrate(DbMigrator.java:113)
    at com.googlecode.flyway.core.Flyway.migrate(Flyway.java:619)
    at com.googlecode.flyway.commandline.Main.main(Main.java:79)
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 654,699 milliseconds ago.  The last packet sent successfully to the server was 17 milliseconds ago.
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
    at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3102)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2991)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3532)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2618)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1749)
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1666)
    at org.springframework.jdbc.core.JdbcTemplate$1UpdateStatementCallback.doInStatement(JdbcTemplate.java:512)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:396)
    ... 9 more
Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2552)
    at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3002)
    ... 18 more
FlywayException: Migration failed !
Occured in com.googlecode.flyway.core.migration.DbMigrator in method migrate, line number 164
Caused by java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
Occured in com.mysql.jdbc.MysqlIO in method readFully, line number 2552

2 个答案:

答案 0 :(得分：2)

我们遇到了这个问题并设法找到适合我们的解决方案。似乎Flyway使用至少两个连接：一个用于锁定schema_version表，另一个用于实际运行更改。如果更改花费的时间足以导致连接锁定schema_version表超时，则会出现此问题。解决这个问题的最简单方法是将MySQL wait_timeout提升到相对较大的水平。在我们的例子中，我们将其设置为480分钟（或28800秒）：

set global wait_timeout=28800;

答案 1 :(得分：1)

一点分析：

由于Flyway命令行工具在启动时会创建两个新连接，因此可以排除连接过时。

然后，Flyway将首先打开元数据表的连接并将其锁定。

然后它将打开第二个连接并执行迁移。我假设这个步骤需要很长时间（从日志开始+ - 11分钟）。

迁移完成后，第二个连接上的事务将提交，新行将通过第一个连接添加到元数据表中。

这是炸弹的地方......但是通过通信而不是连接超时或锁定超时异常。

可能应用程序和数据库之间的某些网络设备（路由器/交换机/代理）正在丢弃非活动连接吗？

相关问题
最新问题