cytnju opened a new issue #2269:
URL: https://github.com/apache/rocketmq/issues/2269
**BUG REPORT**
1. Please describe the issue you observed:
- What did you do (The steps to reproduce)?
- 1.run this demo
```java
public staic void main(String[] args) {
DefaultMQProducer producer;
for(int i = 0; i < 99999; i++) {
producer = new DefaultMQProducer("group");
producer.start();
producer.shutdown();
}
// this case will throw OOM
}
```
- 2. thread dump and grep "RequestHouseKeepingService"
- What did you expect to see?
RequestHouseKeepingService will be cleaned after producer shut down.
- What did you see instead?
2. Please tell us about your environment:
```shell
jre : 1.8
os: mac os
rocketmq-version : 4.7.0
```
3. Other information (e.g. detailed explanation, logs, related issues,
suggestions how to fix, etc):
```RequestHouseKeepingService``` timer construction in
```DefaultMQProducerImpl```
```timer``` will sehcdule in fixed rate after producer start.
```timer``` does not shutdown when shutting down the producer.
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