leizhiyuan opened a new issue #589:
URL: https://github.com/apache/pulsar-client-go/issues/589
#### Expected behavior
only close cnx,not connection
```
// Close closes the connection by
// closing underlying socket connection and closeCh.
// This also triggers callbacks to the ConnectionClosed listeners.
func (c *connection) Close() {
c.closeOnce.Do(func() {
c.Lock()
```
when invoke close , It will not be executed twice.
#### Actual behavior
Tell us what happens instead
#### Steps to reproduce
How can we reproduce the issue
#### System configuration
**Pulsar version**: x.y
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