OpenMetadata/openmetadata-docs/content/v1.6.x/main-concepts/metadata-standard/schemas/entity/data/topic.md

title	slug
topic	/main-concepts/metadata-standard/schemas/entity/data/topic

Topic

A Topic is a feed or an event stream in a Messaging Service into which publishers publish messages and consumed by consumers.

Properties

• id: Unique identifier that identifies this topic instance. Refer to ../../type/basic.json#/definitions/uuid.
• name: Name that identifies the topic. Refer to ../../type/basic.json#/definitions/entityName.
• fullyQualifiedName: Name that uniquely identifies a topic in the format 'messagingServiceName.topicName'. Refer to ../../type/basic.json#/definitions/fullyQualifiedEntityName.
• displayName (string): Display Name that identifies this topic. It could be title or label from the source services.
• description: Description of the topic instance. Refer to ../../type/basic.json#/definitions/markdown.
• version: Metadata version of the entity. Refer to ../../type/entityHistory.json#/definitions/entityVersion.
• updatedAt: Last update time corresponding to the new version of the entity in Unix epoch time milliseconds. Refer to ../../type/basic.json#/definitions/timestamp.
• updatedBy (string): User who made the update.
• service: Link to the messaging cluster/service where this topic is hosted in. Refer to ../../type/entityReference.json.
• serviceType: Service type where this topic is hosted in. Refer to ../services/messagingService.json#/definitions/messagingServiceType.
• messageSchema: Refer to ../../type/schema.json.
• partitions (integer): Number of partitions into which the topic is divided. Minimum: 1.
• cleanupPolicies (array): Topic clean up policies. For Kafka - cleanup.policy configuration.
  • Items: Refer to #/definitions/cleanupPolicy.
• retentionTime (number): Retention time in milliseconds. For Kafka - retention.ms configuration.
• replicationFactor (integer): Replication Factor in integer (more than 1).
• maximumMessageSize (integer): Maximum message size in bytes. For Kafka - max.message.bytes configuration.
• minimumInSyncReplicas (integer): Minimum number replicas in sync to control durability. For Kafka - min.insync.replicas configuration.
• retentionSize (number): Maximum size of a partition in bytes before old data is discarded. For Kafka - retention.bytes configuration. Default: "-1".
• topicConfig: Contains key/value pair of topic configuration. Refer to #/definitions/topicConfig.
• sampleData: Sample data for a topic. Refer to #/definitions/topicSampleData. Default: null.
• owners: Owners of this topic. Refer to ../../type/entityReferenceList.json.
• followers: Followers of this table. Refer to ../../type/entityReferenceList.json. Default: null.
• tags (array): Tags for this table. Default: [].
  • Items: Refer to ../../type/tagLabel.json.
• href: Link to the resource corresponding to this entity. Refer to ../../type/basic.json#/definitions/href.
• changeDescription: Change that lead to this version of the entity. Refer to ../../type/entityHistory.json#/definitions/changeDescription.
• deleted (boolean): When true indicates the entity has been soft deleted. Default: false.
• extension: Entity extension data with custom attributes added to the entity. Refer to ../../type/basic.json#/definitions/entityExtension.
• sourceUrl: Source URL of topic. Refer to ../../type/basic.json#/definitions/sourceUrl.
• domain: Domain the Topic belongs to. When not set, the Topic inherits the domain from the messaging service it belongs to. Refer to ../../type/entityReference.json.
• dataProducts: List of data products this entity is part of. Refer to ../../type/entityReferenceList.json.
• votes: Votes on the entity. Refer to ../../type/votes.json.
• lifeCycle: Life Cycle properties of the entity. Refer to ../../type/lifeCycle.json.
• certification: Refer to ../../type/assetCertification.json.
• sourceHash (string): Source hash of the entity.

Definitions

• cleanupPolicy: Topic clean up policy. For Kafka - cleanup.policy configuration. Must be one of: ["delete", "compact"].
• topicConfig (object): Contains key/value pair of topic configuration.
• topicSampleData (object): This schema defines the type to capture sample data for a topic. Cannot contain additional properties.
  • messages (array): List of local sample messages for a topic.
    • Items (string)

Documentation file automatically generated at 2025-01-15 09:05:25.266839+00:00.