Datastax Cassandra Ruby Driver

Abstract: Actual retry policies supplied as :retry_policy option to Cassandra.cluster don’t need to inherit this class, only implement its methods. This class exists for documentation purposes only.

Mixed into

read_timeout(statement, consistency, required, received, retrieved, retries)

Decides wether to retry a read and at what consistency level.

Note: this method may be called even if required_responses >= received responses if data_present is false.

Parameters:

Name	Type	Details
`statement`	`Statement`	the original statement that timed out
`consistency`	`Symbol`	the original consistency level for the request, one of `CONSISTENCIES`
`required`	`Integer`	the number of responses required to achieve requested consistency level
`received`	`Integer`	the number of responses received by the time the query timed out
`retrieved`	`Boolean`	whether actual data (as opposed to data checksum) was present in the received responses.
`retries`	`Integer`	the number of retries already performed

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	a retry decision

See Also:

write_timeout(statement, consistency, type, required, received, retries)

Decides wether to retry a write and at what consistency level.

Parameters:

Name	Type	Details
`statement`	`Statement`	the original statement that timed out
`consistency`	`Symbol`	the original consistency level for the request, one of `CONSISTENCIES`
`type`	`Symbol`	One of `WRITE_TYPES`
`required`	`Integer`	the number of acks required to achieve requested consistency level
`received`	`Integer`	the number of acks received by the time the query timed out
`retries`	`Integer`	the number of retries already performed

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	a retry decision

See Also:

unavailable(statement, consistency, required, alive, retries)

Decides wether to retry and at what consistency level on an Unavailable exception.

Parameters:

Name	Type	Details
`statement`	`Statement`	the original Statement that timed out
`consistency`	`Symbol`	the original consistency level for the request, one of `CONSISTENCIES`
`required`	`Integer`	the number of replicas required to achieve requested consistency level
`alive`	`Integer`	the number of replicas available for the request
`retries`	`Integer`	the number of retries already performed

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	a retry decision

See Also:

try_again(consistency)

Returns a decision that signals retry at a given consistency

Parameters:

Name	Type	Details
`consistency`	`Symbol`	consistency level for the retry, one of `CONSISTENCIES`

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	tell driver to retry

reraise

Returns a decision that signals to driver to reraise original error to the application

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	tell driver to reraise

ignore

Returns a decision that signals to driver to ignore the error

Returns:

Type	Details
`Cassandra::Policies::Retry::Decision`	tell driver to ignore the error and return an empty result to the application