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https://issues.apache.org/jira/browse/CASSANDRA-4473?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sylvain Lebresne updated CASSANDRA-4473:
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Attachment: 4473.txt
Attaching patch to do this (with an update to the protocol spec). This limit
the number of simultaneous streams to 128 which it seems to me should be enough
and has the advantage of fitting into the current 8 bytes frame header. If that
is really deemed too low, we'll probably have to bump the head to 12 bytes.
> 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
>
> Attachments: 4473.txt
>
>
> 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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