szd1993 opened a new issue #8622:
URL: https://github.com/apache/dubbo/issues/8622
when consumer starting , it will get all dubbo node from zookeeper, then
"Packet len is out of range"
why not only get node that with @DubboReference
just for less request ?
```java
void readLength() throws IOException {
int len = this.incomingBuffer.getInt();
if (len >= 0 && len < this.packetLen) {
this.incomingBuffer = ByteBuffer.allocate(len);
} else {
throw new IOException("Packet len" + len + " is out of range!");
}
}
```
### Environment
* Dubbo version: 2.7.8
* Operating System version: xxx
* Java version: 8
### Steps to reproduce this issue
1. xxx
2. xxx
3. xxx
Pls. provide [GitHub address] to reproduce this issue.
### Expected Result
What do you expected from the above steps？
### Actual Result
What actually happens?
If there is an exception, please attach the exception trace:
```
Just put your stack trace here!
```
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