momo-jun commented on code in PR #15887:
URL: https://github.com/apache/pulsar/pull/15887#discussion_r887747618
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site2/docs/schema-evolution-compatibility.md:
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@@ -30,19 +30,34 @@ For more information, see [Schema compatibility check
strategy](#schema-compatib
### How does Pulsar support schema evolution?
-1. When a producer/consumer/reader connects to a broker, the broker deploys
the schema compatibility checker configured by
`schemaRegistryCompatibilityCheckers` to enforce schema compatibility check.
+The process of how Pulsar supports schema evolution is described as follows.
- The schema compatibility checker is one instance per schema type.
+1. The producer/consumer/reader sends its client `SchemaInfo` to brokers.
- Currently, Avro and JSON have their own compatibility checkers, while all
the other schema types share the default compatibility checker which disables
schema evolution.
+2. Brokers recognize the schema type and deploy the schema compatibility
checker `schemaRegistryCompatibilityCheckers` for that schema type to enforce
schema compatibility check.
Review Comment:
Need to double-check the default compatibility checker for other schema
types. Seems it's not shown in the default value.
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