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Response
4 bytes	Magic number 49 47 4E 49, or "IGNI". Helps to identify misconfigured SSL or different server on the port.
int	Payload length
int	Server version major
int	Server version minor
int	Server version patch
int	Error code (0 for success)
string	Error message (when error code is not 0)
int	When error code is 0: Server idle timeout
string	When error code is 0: Server node id
string	When error code is 0: Server node name (consistent id)
bin	When error code is 0: Server features (bitmask)
map (string → any)	When error code is 0: Extensions (auth, attributes, etc). Client can skip unknown extension data (when server is newer).

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Request
int	Operation code
int	Request id, generated by client and returned as-is in response
...	Operation-specific data

Error message (when error code is not 0

Response
int	Type = 0
int	Request id
int	Flags (1 = partition assignment changed)	Error code (0 for success)
long	Observable timestamp (causality token)
uuid or null	Trace id (null for success)
int	Error code (when trace id is not null)
string	Error message (when trace id is not null)
string or null	Error stack trace (when trace id is not null)
map or null	Error details (when trace id is not null	string	)
...	Operation-specific data (when trace id is null)

Request or response without operation-specific data is called basic request or basic response below.

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Response
bool	whether a tuple with the given key exists

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Request
int	Transaction ID

Basic response

Request
int	Transaction ID

Basic response

Risks and Assumptions

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Page tree

Request
bool	Read-only tx flag
long	Observable timestamp (value from server - see standard response header)