Durability

Use these QoS fields to configure how much and how long data remains retrievable in the system.

Use these QoS fields to configure how much and how long data remains retrievable in the system.

Basic Settings

DDS_DurabilityQosPolicy	kind
	<<basic>> <<spec>> The kind of durability.
DDS_DurabilityQosPolicy	writer_depth
	<<basic>> <<extension>> Indicates the number of samples per instance that a durable DDSDataWriter will send to a late-joining DDSDataReader.
DDS_ResourceLimitsQosPolicy	max_samples
	<<basic>> <<spec>> Represents the maximum samples the middleware can store for any one DDSDataWriter (or DDSDataReader).
DDS_ResourceLimitsQosPolicy	max_instances
	<<basic>> <<spec>> Represents the maximum number of instances a DDSDataWriter (or DDSDataReader) can manage.
DDS_LifespanQosPolicy	duration
	<<basic>> <<spec>> Maximum duration for the data's validity.

Advanced Settings

DDS_AvailabilityQosPolicy	enable_required_subscriptions
	<<extension>> Enables support for required subscriptions in a DDSDataWriter
DDS_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.
DDS_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).
DDS_AvailabilityQosPolicy	required_matched_endpoint_groups
	<<extension>> A sequence of endpoint groups.
DDS_DurabilityQosPolicy	direct_communication
	<<extension>> Indicates whether or not a TRANSIENT or PERSISTENT DDSDataReader should receive samples directly from a TRANSIENT or PERSISTENT DDSDataWriter
DDS_DurabilityQosPolicy	storage_settings
	<<extension>> Configures durable writer history and durable reader state.
DDS_PersistentStorageSettings	enable
	<<extension>> Enables durable writer history in a DDSDataWriter and durable reader state in a DDSDataReader.
DDS_PersistentStorageSettings	file_name
	<<extension>> The file name where the durable writer history or durable reader state will be stored.
DDS_PersistentStorageSettings	trace_file_name
	<<extension>> The file name where to store the SQL statements executed when loading and storing the durable writer history or durable reader state.
DDS_PersistentStorageSettings	journal_kind
	<<extension>> Sets the journal mode of the persistent storage.
DDS_PersistentStorageSettings	synchronization_kind
	<<extension>> Sets the level of synchronization with the physical disk.
DDS_PersistentStorageSettings	vacuum
	<<extension>> Sets the auto-vacuum status of the storage.
DDS_PersistentStorageSettings	restore
	<<extension>> Indicates if the persisted writer history or reader state must be restored.
DDS_PersistentStorageSettings	writer_instance_cache_allocation
	<<extension>> Configures the resource limits associated with the instance durable writer history cache.
DDS_PersistentStorageSettings	writer_sample_cache_allocation
	<<extension>> Configures the resource limits associated with the sample durable writer history cache.
DDS_PersistentStorageSettings	writer_memory_state
	<<extension>> Determines how much state will be kept in memory by the durable writer history in order to avoid accessing the persistent storage in disk.
DDS_PersistentStorageSettings	reader_checkpoint_frequency
	<<extension>> Controls how often the reader state is stored into the database.
DDS_DurabilityServiceQosPolicy	service_cleanup_delay
	<<spec>> Controls when the service is able to remove all information regarding a data instances.
DDS_DurabilityServiceQosPolicy	history_kind
	<<spec>> The kind of history to apply in recouping durable data.
DDS_DurabilityServiceQosPolicy	history_depth
	<<spec>> Setting to use for the DDS_DurabilityQosPolicy::writer_depth when recouping durable data.
DDS_DurabilityServiceQosPolicy	max_samples
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_DurabilityServiceQosPolicy	max_instances
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_DurabilityServiceQosPolicy	max_samples_per_instance
	<<spec>> Part of resource limits QoS policy to apply when feeding a late joiner.
DDS_ResourceLimitsQosPolicy	max_samples_per_instance
	<<spec>> Represents the maximum number of samples of any one instance a DDSDataWriter (or DDSDataReader) can manage.
DDS_DataWriterProtocolQosPolicy	propagate_app_ack_with_no_response
	<<extension>> Controls whether or not a DDSDataWriter receives DDSDataWriterListener::on_application_acknowledgment notifications with an empty or invalid response.
DDS_RtpsReliableWriterProtocol_t	disable_positive_acks_enable_adaptive_sample_keep_duration
	[DEPRECATED] <<extension>> Enables dynamic adjustment of sample keep duration in response to congestion.
DDS_RtpsReliableWriterProtocol_t	disable_positive_acks_min_sample_keep_duration
	<<extension>> The minimum duration a sample is queued for ACK-disabled readers.
DDS_RtpsReliableWriterProtocol_t	disable_positive_acks_max_sample_keep_duration
	<<extension>> The maximum duration a sample is queued for ACK-disabled readers.
DDS_RtpsReliableWriterProtocol_t	disable_positive_acks_decrease_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of contraction of dynamic sample keep duration.
DDS_RtpsReliableWriterProtocol_t	disable_positive_acks_increase_sample_keep_duration_factor
	[DEPRECATED] <<extension>> Controls rate of growth of dynamic sample keep duration.
DDS_BuiltinTopicReaderResourceLimits_t	initial_samples
	<<extension>> Initial number of samples.
DDS_BuiltinTopicReaderResourceLimits_t	max_samples
	<<extension>> Maximum number of samples.
DDS_EntityNameQosPolicy	role_name
	<<extension>> The entity role name.