pycassa - Exceptions and Enums

exception pycassa.AuthenticationException

The credentials supplied when creating a connection did not validate, indicating a bad username or password.

exception pycassa.AuthorizationException

The user that is currently logged in for a connection was not permitted to perform an action.

exception pycassa.InvalidRequestException

Something about the request made was invalid or malformed. The request should not be repeated without modification. Sometimes checking the server logs may help debug what was wrong with the request.

exception pycassa.NotFoundException

The row requested does not exist, or the slice requested was empty.

exception pycassa.UnavailableException

Not enough replicas are up to satisfy the requested consistency level.

exception pycassa.TimedOutException

The replica node did not respond to the coordinator node within rpc_timeout_in_ms (as configured in cassandra.yaml), typically indicating that the replica is overloaded or just went down.

class pycassa.ConsistencyLevel

ANY

Only requires that one replica receives the write or the coordinator stores a hint to replay later. Valid only for writes.

ONE

Only one replica needs to respond to consider the operation a success

QUORUM

ceil(RF/2) replicas must respond to consider the operation a success

ALL

All replicas must respond to consider the operation a success

LOCAL_QUORUM

Requres a quorum of replicas in the local datacenter

LOCAL_ONE

Has the same behavior as ONE, except that Only replicas in the local datacenter are sent queries

EACH_QUORUM

Requres a quorum of replicas in each datacenter

TWO

Two replicas must respond to consider the operation a success

THREE

Three replicas must respond to consider the operation a success