Anonymitaet commented on a change in pull request #4767: [Doc] Add *Schema Type* Section for Schema Chapter URL: https://github.com/apache/pulsar/pull/4767#discussion_r305379586
########## File path: site2/docs/schema-type.md ########## @@ -0,0 +1,151 @@ +--- +id: schema-type +title: Schema type +sidebar_label: Schema type +--- + +Pulsar supports various schema types, which are mainly divided into two categories: + +* Primitive type + +* Complex type + +> #### Note +> +> If you create a schema without specifying a type, producers and consumers can only handle raw bytes. + +## Primitive type + +Currently, Pulsar supports the following primitive types: + +| Primitive Type | Description | +|---|---| +| `BOOLEAN` | A binary value | +| `INT8` | A 8-bit signed integer | +| `INT16` | A 16-bit signed integer | +| `INT32` | A 32-bit signed integer | +| `INT64` | A 64-bit signed integer | +| `FLOAT` | A single precision (32-bit) IEEE 754 floating-point number | +| `DOUBLE` | A double-precision (64-bit) IEEE 754 floating-point number | +| `BYTES` | A sequence of 8-bit unsigned bytes | +| `STRING` | A Unicode character sequence | +| `TIMESTAMP` (`DATE`, `TIME`) | A logic type represents a specific instant in time with millisecond precision. It stores the number of milliseconds since `January 1, 1970, 00:00:00 GMT` as an `INT64` value | + +For primitive types, Pulsar does not store any schema data in `SchemaInfo`. The `type` in `SchemaInfo` is used to determine how to serialize and deserialize the data. + +Some of the primitive schema implementations can use `properties` to store implementation-specific tunable settings. For example, a `string` schema can use `properties` to store the encoding charset to serialize and deserialize strings. + +The conversions between **Pulsar schema types** and **language-specific primitive types** are as below. + +| Schema Type | Java Type| Python Type | +|---|---|---| Review comment: @sijie Are Python and Go available? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
