What steps do you take if the server stops handling the load during write operations?

If the server stops handling load during write operations, the following steps can be taken:

1. Profiling and monitoring — identify bottlenecks: CPU, memory, disk, network.
2. Optimize write code — reduce locks, use batching for writes, asynchronous operations.
3. Scaling:
   • Horizontal scaling — add more servers and distribute the load.
   • Vertical scaling — increase resources of the current server.
4. Use queues — put writes into a queue (e.g., Kafka, RabbitMQ) to unload the main flow.
5. Caching — if possible, cache data to reduce the number of write operations.
6. Database optimization — indexes, partitioning, replication to distribute the load.

Example in Go for batched writing with goroutines:

func batchWrite(data []Data) {
    batchSize := 100
    for i := 0; i < len(data); i += batchSize {
        end := i + batchSize
        if end > len(data) {
            end = len(data)
        }
        batch := data[i:end]
        go writeBatch(batch) // asynchronous write
    }
}

func writeBatch(batch []Data) {
    // logic to write to database
}

This approach helps distribute the load and increase throughput.