The last packet sent successfully to the server was 0 milliseconds ago.[nutch---mysql ]
今天在使用JDBC操作mysql时遇到下面的异常信息:
at com.tomymap.galaxy.virgo.util.DbService.getConnection(DbService.java:66)
at com.tomymap.galaxy.virgo.util.DbService.getConnection(DbService.java:46)
at com.tomymap.galaxy.virgo.dao.PNNDao.getConnection(PNNDao.java:51)
at com.tomymap.galaxy.virgo.dao.DaoBase.executeUpdate(DaoBase.java:69)
at com.tomymap.galaxy.virgo.dao.PNNDao.updatePNNRelation(PNNDao.java:161)
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.buildPNNRelations(PyramidNeuralNetwork.java:400)
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.incrementalGenPNN(PyramidNeuralNetwork.java:144)
at com.tomymap.galaxy.virgo.pnn.PyramidNeuralNetwork.main(PyramidNeuralNetwork.java:410)
着实让人崩溃的信息,花费了一天的时间来解决。
不罗嗦,直接描述解决办法。
- 配置:
- ubuntu10.10
- 5.1.49-1ubuntu8.1
- mysql-connector-java-5.1.18.jar
交互:
300k records
300k * 10 = 3M次访问mysql
处理时间0.5h以内
解决方法:
(1)使用JDBC URL中使用autoReconnect属性,url添加
- &autoReconnect=true&failOverReadOnly=false&maxReconnects=10
(2) 修改MySQL的参数. /etc/my.cnf 添加
- [mysqld]
- wait_timeout=31536000
- interactive_timeout=31536000
(3)重启mysql
- service mysql restart
原因分析:
(1)大量数据访问情况下,mysql connection连接有可能失效
(2)长时间不妨问,connection会失效
更多参考:
http://dev.mysql.com/doc/refman/5.1/zh/database-administration.html#dynamic-system-variables
http://www.blogjava.net/heweiya/archive/2006/01/18/28483.html
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