benczebarna opened a new issue, #5495:
URL: https://github.com/apache/couchdb/issues/5495
## Description
When making requests to CouchDB 3.0.0+, the number of occupied TCP ports
continuously increases and doesn't properly decrease, eventually leading to
port exhaustion.
## Steps to Reproduce
1. Start CouchDB server
2. Run this script to monitor port usage:
```
const { execSync } = require('child_process');
const FREQUENCY = 1000
let previous = []
function getCount(){
const result = execSync('powershell -command "(netstat -ano)"', {
encoding: 'utf8',
windowsHide: true
});
const count = result.split('\n').length
console.log(count);
}
setInterval(() => {
getCount()
}, FREQUENCY);
```
3. Run this curl script or the node script below to generate load:
```
for /l %x in (1, 1, 100) do (
curl localhost:5984
timeout /t 1
)
```
```
async function sleep(ms) {
return new Promise((resolve) => {
setTimeout(resolve, ms);
});
}
async function main() {
while (1) {
const resp = await fetch('http://localhost:5984')
await sleep(100);
}
}
main();
```
## Expected Behaviour
CouchDB should properly reuse existing TCP connections through connection
pooling rather than creating new connections for each request. The number of
occupied ports should remain relatively stable even under load.
## Your Environment
* CouchDB version used: 2.3.1(no issues), 3.0.0(the issue is present),
3.3.0(the issue is present), 3.4.3(the issue is present)
* Operating system and version: Windows 11, Windows Server 2019
## Additional Context
I tried several fixes:
1. Different Node.js versions
2. Setting up connection pooling in HTTP clients
3. Testing with curl commands
4. Changing CouchDB config settings
This problem only happens with CouchDB 3.0.0 and newer - older versions work
fine. When the system is under load, it eventually runs out of available ports.
*Caption: Port count continuously increases over time*
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