[KAFKA-10694] Implement zero copy for FetchSnapshot

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Component/s: replication
• Assignee: Deng Ziming
• Reporter: Jose Armando Garcia Sancio
• Created: 07/Nov/20 19:42
• Updated: 27/Jan/21 02:38
• Resolved: 26/Jan/21 18:35

Description

Change the RawSnapshotWriter and RawSnapshotReader interfaces to allow sending and receiving FetchSnapshotResponse with minimal memory copies.

This could be implemented by making the following changes

interface RawSnapshotWriter {
  ...
  public void append(MemoryRecords records) throws IOException;
} 

interface RawSnapshotReader {
  ...
  public BaseRecords slice(long position) throws IOException;
}

Issue Links

• is blocked by: KAFKA-10427 Implement FetchSnapshot RPC
• is blocked by: KAFKA-10684 Avoid additional copies in envelope path when transmitting over network
• links to: GitHub Pull Request #9819