Sylvain Lebresne created CASSANDRA-4473:
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Summary: Binary protocol: handle asynchronous execution (better)
Key: CASSANDRA-4473
URL: https://issues.apache.org/jira/browse/CASSANDRA-4473
Project: Cassandra
Issue Type: Improvement
Affects Versions: 1.2
Reporter: Sylvain Lebresne
Assignee: Sylvain Lebresne
Priority: Minor
Fix For: 1.2
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.
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