remove RPC sessions
-------------------
Key: AVRO-115
URL: https://issues.apache.org/jira/browse/AVRO-115
Project: Avro
Issue Type: Improvement
Components: spec
Reporter: Doug Cutting
Assignee: Doug Cutting
The spec currently has a notion of an RPC session. Within a session requests
and responses need not be prefixed by handshakes.
The existing RPC implementations (python and Java) assume that all transports
naturally have sessions, which is not the case. An HTTP transport may or may
not have a session, a UDP transport does not naturally have a session.
Moreover, we anticipate the implementation in Avro of a high-performance
scalable transport that, e.g., permits multiplexing of requests and responses
over a single TCP connection. Establishing a session in this context creates a
race condition. Also, it would be advantageous if a single connection could
service multiple protocols.
For the above reasons, I propose we remove the notion of RPC sessions. Each
request and response payload must then be prefixed by a HandshakeRequest or
HandshakeResponse respectively. In most cases this adds just 34 bytes to
requests and 4 bytes to responses. The added runtime costs are negligible, as,
instead of using a session key to access the cached protocol instead the
protocol hashes are used.
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