Raven888888 commented on issue #12284:
URL: https://github.com/apache/pulsar/issues/12284#issuecomment-1121027262

   I noticed that one of the differences of `broker.conf` between pulsar 2.7.0 
and pulsar 2.8.0+ is the introduction of this 
   ```
   # The schema compatibility strategy in broker level.
   # SchemaCompatibilityStrategy : ALWAYS_INCOMPATIBLE, ALWAYS_COMPATIBLE, 
BACKWARD, FORWARD,
   # FULL, BACKWARD_TRANSITIVE, FORWARD_TRANSITIVE, FULL_TRANSITIVE
   schemaCompatibilityStrategy=FULL
   ```
   Could it be what causing the `BufferUnderflowException`?
   


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