记录线上一次线程hang住问题

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线上发现执行某特定任务在某个特定时间点后不再work。该任务由线程池中线程执行定时周期性调度，根据日志查看无任何异常。从代码研判应该无关定时任务框架，因为对提交的定时任务做了wrap，会将异常都catch住，保证下次仍然能够正常调度。

通过jstack导出堆栈信息，发现问题线程的堆栈信息如下:

"OperatorDispatch" #338 prio=5 os_prio=0 tid=0x00007f1140d63000 nid=0x2edc runnable [0x00007f101f8cd000]

   java.lang.Thread.State: RUNNABLE

        at java.net.SocketInputStream.socketRead0(Native Method)

        at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)

        at java.net.SocketInputStream.read(SocketInputStream.java:170)

        at java.net.SocketInputStream.read(SocketInputStream.java:141)

        at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:101)

        at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:144)

        at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:174)

        - locked <0x00000006c4a6d190> (a com.mysql.jdbc.util.ReadAheadInputStream)

        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3008)

        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3469)

        at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3459)

        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3900)

        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527)

        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680)

        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2490)

        - locked <0x00000006c501d648> (a com.mysql.jdbc.JDBC4Connection)

        at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858)

        - locked <0x00000006c501d648> (a com.mysql.jdbc.JDBC4Connection)

        at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1197)

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