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Kafka has a good throughput with sequential Writes and Reads.
Kafka can move a lot of data because of the zero copy read principle:
Before:
- Disc to OS buffer
- Write the content of the OS buffer to the RAM
- Copy the data to the application Buffer
- Copy the data back to the socket buffer
- Copy the data from the socket to the Network Interface Chip buffer and send it
With zero-copy read principle:
- Read from the disc and load it into the OS Buffer
- Directly copy to the NIC Buffer (the CPU is not involved)