简介：
CDH6.3.1集成Flink1.14.0后，sql client使用过程中出现拒绝连接的情况，以下为问题复现及解决方法。
环境：
CDH6.3.1
Flink1.14.0
报错内容：
[ERROR] Could not execute SQL statement. Reason:
java.net.ConnectException: 拒绝连接
错误日志：
# vi ../log/flink-root-sql-client-node3.mostonetech.com.log
Caused by: org.apache.flink.shaded.netty4.io.netty.channel.AbstractChannel$AnnotatedConnectException: 拒绝连接: localhost/127.0.0.1:8081
Caused by: java.net.ConnectException: 拒绝连接
测试步骤：
1. 执行sql-client.sh
# .//sql-client.sh
Flink SQL> show catalogs;
+-----------------+
| catalog name |
+-----------------+
| default_catalog |
+-----------------+
1 row in set
2
