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All messages, including handshake, start with int message length (excluding these first 4 bytes). E.g. empty message would be represented by 4 zero bytes.

intLength of Data
...Data

Length is omitted in all message descriptions below for brevity.

Handshake

The first message upon connection establishment must be a handshake. Handshake ensures that client and server versions are compatible.

Request
byteHandshake code, always 1
shortVersion major
shortVersion minor
shortVersion patch
byte

Client code, always 2

Response (success)
byteSuccess flag, 1
Response (failure)
byteSuccess flag, 0
shortServer version major
shortServer version minor
shortServer version patch
stringError message


Discussion Links

http://apache-ignite-developers.2346864.n4.nabble.com/Thin-client-protocol-message-format-td20300.html

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