[CASSANDRA-4473] Binary protocol: handle asynchronous execution (better)

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Fixed
• Fix Version/s: 1.2.0 beta 1
• Assignee: Sylvain Lebresne
• Reporter: Sylvain Lebresne

Authors

Sylvain Lebresne

Reviewers

paul cannon

• Created: 30/Jul/12 18:34
• Updated: 16/Apr/19 09:32
• Resolved: 01/Aug/12 18:40

Description

The current implementation of the binary protocol handle message asynchronously. I.e. if a client send multiple requests simultaneously, we will handle all request in parallel and in particular we make no guarantee on the order with which the response are sent. But then the client has no way to associate which response correspond to which query. This ticket proposes adding a stream id to each frame. This id would be set to by the client, and the server would just reuse the same id in the response. That way, the client can send multiple simultaneous queries with different stream id and know which response correspond to which request.

This has the advantages of 1) being trivial to implement and 2) leaving the possibility for synchronous clients (that wait for responses before sending a new request) to ignore that stream id and just use 0 all the time.