OpenMetadata/docs/openmetadata-apis/schemas/entities/topic.md

Topic

This schema defines the Topic entity. A topic is a feed into which messages are published by publishers and read from by consumers in a messaging service.

**$id: **https://open-metadata.org/schema/entity/data/topic.json

Type: object

Properties

• id required
  • Unique identifier that identifies this topic instance.
  • $ref: ../../type/basic.json#/definitions/uuid
• name required
  • Name that identifies the topic.
  • $ref: #/definitions/topicName
• fullyQualifiedName
  • Name that uniquely identifies a topic in the format 'messagingServiceName.topicName'.
  • Type: string
• displayName
  • Display Name that identifies this topic. It could be title or label from the source services.
  • Type: string
• description
  • Description of the topic instance.
  • Type: string
• version
  • Metadata version of the entity.
  • $ref: ../../type/basic.json#/definitions/entityVersion
• updatedAt
  • Last update time corresponding to the new version of the entity.
  • $ref: ../../type/basic.json#/definitions/dateTime
• updatedBy
  • User who made the update.
  • Type: string
• service required
  • Link to the messaging cluster/service where this topic is hosted in.
  • $ref: ../../type/entityReference.json
• partitions required
  • Number of partitions into which the topic is divided.
  • Type: integer
  • Range: ≥ 1
• schemaText
  • Schema used for message serialization. Optional as some topics may not have associated schemas.
  • Type: string
• schemaType
  • Schema used for message serialization.
  • $ref: #/definitions/schemaType
• cleanupPolicies
  • Topic clean up policies. For Kafka - cleanup.policy configuration.
  • Type: array
    • Items
    • $ref: #/definitions/cleanupPolicy
• retentionTime
  • Retention time in milliseconds. For Kafka - retention.ms configuration.
  • Type: number
• replicationFactor
  • Replication Factor in integer (more than 1).
  • Type: integer
• maximumMessageSize
  • Maximum message size in bytes. For Kafka - max.message.bytes configuration.
  • Type: integer
• minimumInSyncReplicas
  • Minimum number replicas in sync to control durability. For Kafka - min.insync.replicas configuration.
  • Type: integer
• retentionSize
  • Maximum size of a partition in bytes before old data is discarded. For Kafka - retention.bytes configuration.
  • Type: number
  • Default: "-1"
• owner
  • Owner of this topic.
  • $ref: ../../type/entityReference.json
• followers
  • Followers of this table.
  • $ref: ../../type/entityReference.json#/definitions/entityReferenceList
• tags
  • Tags for this table.
  • Type: array
    • Items
    • $ref: ../../type/tagLabel.json
• href
  • Link to the resource corresponding to this entity.
  • $ref: ../../type/basic.json#/definitions/href

Type definitions in this schema

topicName

• Name that identifies a topic.
• Type: string
• The value must match this pattern: ^[^.]*$
• Length: between 1 and 64

schemaType

• Schema type used for the message.
• The value is restricted to the following:
  1. "Avro"
  2. "Protobuf"
  3. "JSON"
  4. "Other"

cleanupPolicy

• Topic clean up policy. For Kafka - cleanup.policy configuration.
• The value is restricted to the following:
  1. "delete"
  2. "compact"

This document was updated on: Monday, October 18, 2021