用tcc-and-fescar这个demo并发测试同一个请求，锁表fescar_lock主键冲突。 #143
Description
错误描述：
用tcc-and-fescar这个demo并发测试同一个请求：
http://172.32.147.38:9990/buySth?userId=1&money=10
会出现fescar_lock这个加锁表的主键冲突。
请教下同时多次对同一条记录做修改操作时，通常是不是应该排队等待上一个请求的锁释放了，
才能继续添加另外一次请求的锁。而不是对同一条记录同时加锁，不然会导致这个锁表的主键冲突。
请问下这边我应该怎么处理？ 谢谢！！
错误日志如下：
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Duplicate entry 'coupon-1' for key 'PRIMARY'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_161]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_161]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_161]
at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_161]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3976) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3912) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2486) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2079) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2013) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5104) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1998) ~[mysql-connector-java-5.1.46.jar:5.1.46]
at com.alibaba.druid.pool.DruidPooledPreparedStatement.executeUpdate(DruidPooledPreparedStatement.java:256) ~[druid-1.1.13.jar:1.1.13]
at com.yiqiniu.easytrans.protocol.autocps.EtDataSourceManager.doLockKeys(EtDataSourceManager.java:304) ~[classes/:na]
at com.yiqiniu.easytrans.protocol.autocps.EtDataSourceManager.branchRegister(EtDataSourceManager.java:91) ~[classes/:na]