mycat连接自动关闭close connection,reason:stream closed

目的测试mycat读写分离问题描述：启动mycat之后，日志一直报这个错。
INFO   | jvm 1    | 2018/03/19 18:42:52 | 2018-03-19 18:42:52,586 [INFO ][$_NIOREACTOR-0-RW] can't get connection for sql :select user()  (io.mycat.sqlengine.SQLJob:SQLJob.java:114) 
INFO   | jvm 1    | 2018/03/19 18:42:52 | 2018-03-19 18:42:52,586 [INFO ][$_NIOREACTOR-0-RW] close connection,reason:stream closed ,MySQLConnection [id=3436, lastTime=1521456172570, user=dbwrite, schema=test, old shema=test, borrowed=false, fromSlaveDB=true, threadId=0, charset=utf8, txIsolation=3, autocommit=true, attachment=null, respHandler=null, host=192.168.1.131, port=3306, statusSync=null, writeQueue=0, modifiedSQLExecuted=false]  (io.mycat.net.AbstractConnection:AbstractConnection.java:508) 用命令行登录mycat，可以查看到逻辑库，逻辑表：
mysql> show databases;
+----------+
| DATABASE |
+----------+
| TESTDB   |
+----------+
mysql> explain insert into tb1 values(1,'ghf');
+-----------+---------------------------------+
| DATA_NODE | SQL                             |
+-----------+---------------------------------+
| dn1       | insert into tb1 values(1,'ghf') |
+-----------+---------------------------------+
但是实际操作数据库得时候：
mysql> insert into tb1 values(1,'ghf');
ERROR 3009 (HY000): java.lang.IllegalArgumentException: Invalid DataSource:0用navicat连，插入数据也不行：环境：linux 6.4
主机一：mycat+mysql主
主机二：mysql从schema.xml配置：
         <schema name="TESTDB" checkSQLschema="false" sqlMaxLimit="100">
                <table name="tb1" type="global" dataNode="dn1" />
        </schema>        <dataNode name="dn1" dataHost="localhost1" database="test" />        <dataHost name="localhost1" maxCon="1000" minCon="10" balance="1"
                          writeType="0" dbType="mysql" dbDriver="native" switchType="1"  slaveThreshold="100">
                <heartbeat>select user()</heartbeat>
                <writeHost host="hostM1" url="192.168.1.135:3306" user="dbwrite"
                                   password="123456">
                        <readHost host="hostS2" url="192.168.1.131:3306" user="dbwrite" password="123456" />
                </writeHost>
        </dataHost>server.xml配置：
        <user name="dbwrite">
                <property name="password">123456</property>
                <property name="schemas">TESTDB</property>
        </user>
求各位大佬帮忙看一下，堵在这好几天了！