我有一些数据迁移脚本（从talend数据迁移工具生成的shell脚本），它连接到MySQL并执行一些操作。
其中一个脚本执行繁重的计算，并在我在本地计算机上执行它时进行锁定，它在大约2.5小时内完成，并且与MySQL的连接保持在睡眠模式
来自MySQL Processlist
mysql> show processlist;
+-------+------+---------------------+-------------------+---------+------+-------+------------------+
| Id | User | Host | db | Command | Time | State | Info |
+-------+------+---------------------+-------------------+---------+------+-------+------------------+
| 10631 | root | localhost | psdata_psdatabase | Sleep | 18 | | NULL |
| 11195 | root | localhost | psdata_psdatabase | Sleep | 5497 | | NULL |
| 11261 | root | localhost | psdata_psdatabase | Query | 0 | NULL | show processlist |
| 11492 | root | 192.168.9.213:56507 | psdata_psdatabase | Sleep | 5509 | | NULL |
| 11493 | root | 192.168.9.213:56508 | psdata_psdatabase | Sleep | 5508 | | NULL |
+-------+------+---------------------+-------------------+---------+------+-------+------------------+
5 rows in set (0.00 sec)
192.168.9.213中的主题是该脚本。
但是当我在生产/暂存时执行相同的脚本时，我在大约1小时后收到错误，而且我在一小时内也没有看到MySQL Processlist中的任何活动，因为我的本地计算机上有睡眠模式的连接
"com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure"
堆栈跟踪
[root@host5 /home/talend/PharmaSecure_psData_localhost/execute_analysis_jobs]# sh execute_analysis_jobs_run.sh
Analysis Started
Started psVerify_interaction_analysis
Ended psVerify_interaction_analysis
Started psVerify_interaction_analysis_p2
Exception in component tMysqlOutput_1
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet successfully received from the server was 3,350,869 milliseconds ago. The last packet sent successfully to the server was 31 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:525)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3851)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2471)
at com.mysql.jdbc.MysqlIO.disableMultiQueries(MysqlIO.java:3771)
at com.mysql.jdbc.PreparedStatement.executePreparedBatchAsMultiStatement(PreparedStatement.java:1675)
at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1463)
at pharmasecure_ps.psverify_interaction_analysis_p2_0_1.psVerify_interaction_analysis_p2.tMysqlInput_1Process(psVerify_interaction_analysis_p2.java:3576)
at pharmasecure_ps.psverify_interaction_analysis_p2_0_1.psVerify_interaction_analysis_p2.tMysqlInput_6Process(psVerify_interaction_analysis_p2.java:1196)
at pharmasecure_ps.psverify_interaction_analysis_p2_0_1.psVerify_interaction_analysis_p2.tJava_1Process(psVerify_interaction_analysis_p2.java:687)
at pharmasecure_ps.psverify_interaction_analysis_p2_0_1.psVerify_interaction_analysis_p2.runJobInTOS(psVerify_interaction_analysis_p2.java:7365)
at pharmasecure_ps.psverify_interaction_analysis_p2_0_1.psVerify_interaction_analysis_p2.runJob(psVerify_interaction_analysis_p2.java:7207)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tRunJob_1Process(psVerify_interaction_analysis.java:4911)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tJava_2Process(psVerify_interaction_analysis.java:4806)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_8Process(psVerify_interaction_analysis.java:4719)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_6Process(psVerify_interaction_analysis.java:2821)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_5Process(psVerify_interaction_analysis.java:1541)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_9Process(psVerify_interaction_analysis.java:6433)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tJava_1Process(psVerify_interaction_analysis.java:5924)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.runJobInTOS(psVerify_interaction_analysis.java:6652)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.runJob(psVerify_interaction_analysis.java:6494)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_4Process(execute_analysis_jobs.java:1174)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_1Process(execute_analysis_jobs.java:838)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tJava_1Process(execute_analysis_jobs.java:682)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.runJobInTOS(execute_analysis_jobs.java:2749)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.main(execute_analysis_jobs.java:2596)
Caused by: java.net.SocketException: Broken pipe
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:109)
at java.net.SocketOutputStream.write(SocketOutputStream.java:153)
at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:82)
at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:140)
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3832)
... 23 more
Exception in component tRunJob_1
java.lang.RuntimeException: Child job running failed
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tRunJob_1Process(psVerify_interaction_analysis.java:4932)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tJava_2Process(psVerify_interaction_analysis.java:4806)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_8Process(psVerify_interaction_analysis.java:4719)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_6Process(psVerify_interaction_analysis.java:2821)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_5Process(psVerify_interaction_analysis.java:1541)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tMysqlInput_9Process(psVerify_interaction_analysis.java:6433)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.tJava_1Process(psVerify_interaction_analysis.java:5924)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.runJobInTOS(psVerify_interaction_analysis.java:6652)
at pharmasecure_ps.psverify_interaction_analysis_0_1.psVerify_interaction_analysis.runJob(psVerify_interaction_analysis.java:6494)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_4Process(execute_analysis_jobs.java:1174)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_1Process(execute_analysis_jobs.java:838)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tJava_1Process(execute_analysis_jobs.java:682)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.runJobInTOS(execute_analysis_jobs.java:2749)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.main(execute_analysis_jobs.java:2596)
Exception in component tRunJob_4
java.lang.RuntimeException: Child job running failed
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_4Process(execute_analysis_jobs.java:1195)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_1Process(execute_analysis_jobs.java:838)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tJava_1Process(execute_analysis_jobs.java:682)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.runJobInTOS(execute_analysis_jobs.java:2749)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.main(execute_analysis_jobs.java:2596)
Exception in component tSendMail_2
javax.mail.AuthenticationFailedException: failed to connect
at javax.mail.Service.connect(Service.java:322)
at javax.mail.Service.connect(Service.java:172)
at javax.mail.Service.connect(Service.java:121)
at javax.mail.Transport.send0(Transport.java:190)
at javax.mail.Transport.send(Transport.java:120)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tSendMail_2Process(execute_analysis_jobs.java:1433)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_4_onSubJobError(execute_analysis_jobs.java:508)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.tRunJob_4_error(execute_analysis_jobs.java:384)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs$TalendException.printStackTrace(execute_analysis_jobs.java:330)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs$TalendException.printStackTrace(execute_analysis_jobs.java:318)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs$TalendException.printStackTrace(execute_analysis_jobs.java:318)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.runJobInTOS(execute_analysis_jobs.java:2755)
at pharmasecure_ps.execute_analysis_jobs_0_1.execute_analysis_jobs.main(execute_analysis_jobs.java:2596)
答案 0 :(得分：1)
检查mysql服务器上的wait_timeout变量的值。 生产服务器上的变量值可能太低。
要显示值，请输入以下命令：
SHOW VARIABLES LIKE 'wait_timeout'
在本地服务器中设置与生产相同的值，以查看是否可以重现该问题。 如果可以重现问题，则可能必须增加生产服务器上wait_timeout的值。
http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_wait_timeout