mysql - 线程卡在 java.net.SocketInputStream.socketRead0(Native Method) 上，有人知道发生了什么吗？

Question

 "[GMQMsgConsumeThread:113.105.152.146:22300, queue:Q_COOMIX_IMG_META]" prio=10 tid=0x08431000 nid=0x774c runnable [0x6e6b5000]
       java.lang.Thread.State: RUNNABLE
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at com.mysql.jdbc.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)
        at com.mysql.jdbc.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)
        at com.mysql.jdbc.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)
        - locked <0x83f593e0> (a com.mysql.jdbc.util.ReadAheadInputStream)
        at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1910)
        at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:501)
        at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:379)
        at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:1970)
        at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1387)
        at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1195)
        - locked <0x83f596a0> (a java.lang.Object)
        at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:693)
        at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1266)
        - locked <0x83f596a0> (a java.lang.Object)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
        at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
    .........
    .........

       Locked ownable synchronizers:
        - None

关系环境如下:

MySQL: 5.1.56 mysql jdbc 驱动程序:MySQL Connector/J 5.0.4 DBCP 1.4

关于可能是什么原因的任何想法？

谢谢

Answer 1

这是死锁造成的。有未提交的数据正在尝试读取。我的情况是数据在数据库模式上，因为我试图做的操作是一个 ALTER TABLE。