Reliability QoS

Reliability related QoS.

Reliability related QoS.

Use these QoS fields to configure the reliable delivery of your application data – this includes those settings that configure the reliability protocol.

See Reliable Delivery Model, in the Core Libraries User's Manual, for more information about the DDS reliability protocol.

Basic Settings

com.rti.dds.infrastructure.ReliabilityQosPolicy	kind
	<<basic>> <<spec>> Kind of reliability.
com.rti.dds.infrastructure.ReliabilityQosPolicy	max_blocking_time
	<<basic>> <<spec>> The maximum time a DataWriter can block on a write() call.
com.rti.dds.infrastructure.HistoryQosPolicy	kind
	<<basic>> <<spec>> Specifies the kind of history to be kept.
com.rti.dds.infrastructure.HistoryQosPolicy	depth
	<<basic>> <<spec>> Specifies the number of samples per instance to be kept, when the kind is com.rti.dds.infrastructure.HistoryQosPolicyKind.HistoryQosPolicyKind.KEEP_LAST_HISTORY_QOS
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	heartbeat_period
	<<basic>> <<extension>> The period at which to send heartbeats.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	fast_heartbeat_period
	<<basic>> <<extension>> An alternative heartbeat period used when a reliable writer needs to flush its unacknowledged samples more quickly.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	late_joiner_heartbeat_period
	<<basic>> <<extension>> An alternative heartbeat period used when a reliable reader joins late and needs to be caught up on cached samples of a reliable writer more quickly than the normal heartbeat rate.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	min_send_window_size
	<<basic>> <<extension>> Minimum size of send window of unacknowledged samples
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	max_send_window_size
	<<basic>> <<extension>> Maximum size of send window of unacknowledged samples

Advanced Settings

com.rti.dds.infrastructure.AvailabilityQosPolicy	enable_required_subscriptions
	<<extension>> Enables support for required subscriptions in a com.rti.dds.publication.DataWriter
com.rti.dds.infrastructure.AvailabilityQosPolicy	max_data_availability_waiting_time
	<<extension>> Defines how much time to wait before delivering a sample to the application without having received some of the previous samples.
com.rti.dds.infrastructure.AvailabilityQosPolicy	max_endpoint_availability_waiting_time
	<<extension>> Defines how much time to wait to discover DataWriters providing samples for the same data source (virtual GUID).
com.rti.dds.infrastructure.AvailabilityQosPolicy	required_matched_endpoint_groups
	<<extension>> A sequence of endpoint groups.
com.rti.dds.infrastructure.ReliabilityQosPolicy	acknowledgment_kind
	<<extension>> Kind of reliable acknowledgment
com.rti.dds.infrastructure.ReliabilityQosPolicy	instance_state_consistency_kind
	<<extension>> Whether instance state consistency is enabled
com.rti.dds.infrastructure.DataReaderResourceLimitsQosPolicy	max_app_ack_response_length
	<<extension>> Maximum length of application-level acknowledgment response data
com.rti.dds.infrastructure.DataWriterResourceLimitsQosPolicy	max_app_ack_remote_readers
	<<extension>> The maximum number of application-level acknowledging remote readers supported by a com.rti.dds.publication.DataWriter
com.rti.dds.infrastructure.DataReaderProtocolQosPolicy	rtps_reliable_reader
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable reader associated with a com.rti.dds.subscription.DataReader. This parameter only has effect if the reader is configured with com.rti.dds.infrastructure.ReliabilityQosPolicyKind.RELIABLE_RELIABILITY_QOS com.rti.dds.infrastructure.ReliabilityQosPolicyKind.
com.rti.dds.infrastructure.DataReaderProtocolQosPolicy	disable_positive_acks
	<<extension>> Whether the reader sends positive acknowledgements to writers.
com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	push_on_write
	<<extension>> Whether to push sample out when write is called.
com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	disable_positive_acks
	<<extension>> Controls whether or not the writer expects positive acknowledgements from matching readers.
com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	propagate_app_ack_with_no_response
	<<extension>> Controls whether or not a com.rti.dds.publication.DataWriter receives com.rti.dds.publication.DataWriterListener.on_application_acknowledgment notifications with an empty or invalid response.
com.rti.dds.infrastructure.DataWriterProtocolQosPolicy	rtps_reliable_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with a com.rti.dds.publication.DataWriter. This parameter only has effect if both the writer and the matching reader are configured with com.rti.dds.infrastructure.ReliabilityQosPolicyKind.RELIABLE_RELIABILITY_QOS com.rti.dds.infrastructure.ReliabilityQosPolicyKind.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	publication_reader
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in publication reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	subscription_reader
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in subscription reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	participant_message_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in participant message writer. This parameter only has effect if the matching participant message reader is configured with com.rti.dds.infrastructure.ReliabilityQosPolicyKind.RELIABLE_RELIABILITY_QOS com.rti.dds.infrastructure.ReliabilityQosPolicyKind.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	participant_message_reader_reliability_kind
	[DEPRECATED] <<extension>> Reliability policy for a built-in participant message reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	participant_message_reader
	<<extension>> RTPS reliable reader protocol-related configuration settings for a built-in participant message reader. This parameter only has effect if com.rti.dds.infrastructure.DiscoveryConfigQosPolicy.participant_message_reader_reliability_kind is set to com.rti.dds.infrastructure.ReliabilityQosPolicyKind.RELIABLE_RELIABILITY_QOS.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	publication_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in publication writer.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	subscription_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in subscription writer.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	service_request_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in com.rti.dds.topic.builtin.ServiceRequest writer.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	service_request_reader
	<<extension>> RTPS reliable reader protocol-related configuration settings for a built-in com.rti.dds.topic.builtin.ServiceRequest reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	secure_volatile_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with the built-in secure volatile writer.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	secure_volatile_reader
	<<extension>> RTPS reliable reader protocol-related configuration settings for the built-in secure volatile reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	participant_configuration_reader
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable reader associated with a built-in participant configuration reader.
com.rti.dds.infrastructure.DiscoveryConfigQosPolicy	participant_configuration_writer
	<<extension>> RTPS protocol-related configuration settings for the RTPS reliable writer associated with a built-in participant configuration writer.
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	min_heartbeat_response_delay
	<<extension>> The minimum delay to respond to a heartbeat.
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	max_heartbeat_response_delay
	<<extension>> The maximum delay to respond to a heartbeat.
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	heartbeat_suppression_duration
	<<extension>> The duration a reader ignores consecutively received heartbeats
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	nack_period
	<<extension>> The period at which to send NACKs
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	receive_window_size
	<<extension>> The number of received out-of-order samples a reader can keep at a time
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	round_trip_time
	<<extension>> The duration from sending a NACK to receiving a repair of a sample
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	app_ack_period
	<<extension>> The period at which application-level acknowledgment messages are sent
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	min_app_ack_response_keep_duration
	<<extension>> Minimum duration for which application-level acknowledgment response data is kept
com.rti.dds.infrastructure.RtpsReliableReaderProtocol_t	samples_per_app_ack
	<<extension>> The minimum number of samples acknowledged by one application-level acknowledgment message
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	low_watermark
	<<extension>> When the number of unacknowledged samples in the current send window of a reliable writer meets or falls below this threshold, the com.rti.dds.infrastructure.StatusKind.StatusKind.RELIABLE_WRITER_CACHE_CHANGED_STATUS is considered to have changed.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	high_watermark
	<<extension>> When the number of unacknowledged samples in the current send window of a reliable writer meets or exceeds this threshold, the com.rti.dds.infrastructure.StatusKind.StatusKind.RELIABLE_WRITER_CACHE_CHANGED_STATUS is considered to have changed.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	virtual_heartbeat_period
	<<extension>> The period at which to send virtual heartbeats. Virtual heartbeats inform the reliable reader about the range of samples currently present, for each virtual GUID, in the reliable writer's queue.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	samples_per_virtual_heartbeat
	<<extension>> The number of samples that a reliable writer has to publish before sending a virtual heartbeat.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	max_heartbeat_retries
	<<extension>> The maximum number of periodic heartbeat retries before marking a remote reader as inactive.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	inactivate_nonprogressing_readers
	<<extension>> Whether to treat remote readers as inactive when their NACKs do not progress
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	heartbeats_per_max_samples
	<<extension>> The number of piggyback heartbeats sent per max send window.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	min_nack_response_delay
	<<extension>> The minimum delay to respond to a NACK or NACK_FRAG.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	max_nack_response_delay
	<<extension>> The maximum delay to respond to a NACK or NACK_FRAG.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	nack_suppression_duration
	<<extension>> The duration for ignoring consecutive NACKs/NACK_FRAGs that may trigger redundant repairs.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	max_bytes_per_nack_response
	<<extension>> The maximum total message size when resending rejected samples or data fragments.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_positive_acks_enable_adaptive_sample_keep_duration
	[DEPRECATED] <<extension>> Enables dynamic adjustment of sample keep duration in response to congestion.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_positive_acks_min_sample_keep_duration
	<<extension>> The minimum duration a sample is queued for ACK-disabled readers.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_positive_acks_max_sample_keep_duration
	<<extension>> The maximum duration a sample is queued for ACK-disabled readers.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_positive_acks_decrease_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of contraction of dynamic sample keep duration.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_positive_acks_increase_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of growth of dynamic sample keep duration.
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	send_window_update_period
	<<extension>> Period in which send window may be dynamically changed
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	send_window_increase_factor
	<<extension>> Increases send window size by this percentage when reacting dynamically to network conditions
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	send_window_decrease_factor
	<<extension>> Decreases send window size by this percentage when reacting dynamically to network conditions
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	enable_multicast_periodic_heartbeat
	<<extension>> Whether periodic heartbeat messages are sent over multicast
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	multicast_resend_threshold
	<<extension>> The minimum number of requesting readers needed to trigger a multicast resend
com.rti.dds.infrastructure.RtpsReliableWriterProtocol_t	disable_repair_piggyback_heartbeat
	<<extension>> Prevents piggyback heartbeats from being sent with repair samples