dse.hosts - Hosts and Connection Pools

Connection pooling and host management.

class Host

Represents a single Cassandra node.

Attributes

broadcast_address

= None

broadcast address configured for the node, if available (‘peer’ in system.peers table). This is not present in the system.local table for older versions of Cassandra. It is also not queried if token_metadata_enabled is False.

listen_address

= None

listen address configured for the node, if available. This is only available in the system.local table for newer versions of Cassandra. It is also not queried if token_metadata_enabled is False. Usually the same as broadcast_address unless configured differently in cassandra.yaml.

is_up

= None

True if the node is considered up, False if it is considered down, and None if it is not known if the node is up or down.

release_version

= None

release_version as queried from the control connection system tables

dse_version

= None

dse_version as queried from the control connection system tables. Only populated when connecting to DSE with this property available. Not queried if token_metadata_enabled is False.

dse_workload

= None

DSE workload queried from the control connection system tables. Only populated when connecting to DSE with this property available. Not queried if token_metadata_enabled is False. This is a legacy attribute that does not portray multiple workloads in a uniform fashion. See also dse_workloads.

dse_workloads

= None

DSE workloads set, queried from the control connection system tables. Only populated when connecting to DSE with this property available (added in DSE 5.1). Not queried if token_metadata_enabled is False.

address

= None

The IP address of the node. This is the RPC address the driver uses when connecting to the node

conviction_policy

= None

A ConvictionPolicy instance for determining when this node should be marked up or down.

datacenter

The datacenter the node is in.

rack

The rack the node is in.

exception NoConnectionsAvailable

All existing connections to a given host are busy, or there are no open connections.