How to Fix \'use of closed network connection\' Errors in Go\'s net/http Package Under High Load?

Errors in HTTP Connection Management with net/http

The error "use of closed network connection" in net/http indicates a connection issue that occurs specifically during high traffic conditions. This error may also be accompanied by "connection reset by peer."

Causes:

These errors typically arise when the number of concurrent requests exceeds the server's capacity to handle them. This can lead to connection closures or resets, resulting in the above errors.

Mitigation:

To address this issue, consider the following measures:

• Implement Retry Logic:
  Retry failed requests with a backoff mechanism. This limits the number of simultaneous connection attempts, preventing further strain on the server.
• Increase Max Idle Connections Per Host:
  Increase the value of Transport.MaxIdleConnsPerHost to reduce the frequency of creating new connections. This is especially beneficial if the requests are made to a small number of hosts.
• Upgrade to Go 1.5 Beta:
  Go 1.5 Beta includes improvements in keep-alive connection management, which may mitigate these errors.

Additional System Settings:

The following sysctl settings can also be optimized to handle higher traffic:

• net.core.somaxconn: Increase the maximum number of pending connections in the listen queue.
• net.core.netdev_max_backlog: Increase the maximum number of queued requests for a network device.

Monitoring:

Use netstat to monitor the number of connections in various states, such as TIME_WAIT and SYN_SENT. High values in these states can indicate potential issues.

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