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Annotations

Annotations can be applied to the fields in a stream’s schema. Annotations provide Valo extra details as to how a field’s data should be processed.

Default Timestamp

The default-timestamp annotation can be applied to a single field to indicate that the field should be used as the primary source of “time” for data on the stream.

Adding this annotation allows for more efficient indexing in the repositories and will be used where possible to optimise data distribution across the nodes in the cluster.

The default-timestamp annotation can only be applied to datetime fields.

A field is annotated with default-timestamp like so:

{
  "type": "record",
  "properties": {
    "timestamp": { "type" : "datetime", "annotations": ["urn:itrs:default-timestamp"] }
  }
}