steveloughran commented on PR #7128:
URL: https://github.com/apache/hadoop/pull/7128#issuecomment-2432845760

   Avro test failures. 
   ```
   Forbidden class org.apache.hadoop.fs.Path! This class is not trusted to be 
included in Avro schema using java-class. Please set 
org.apache.avro.SERIALIZABLE_PACKAGES system property with the packages you 
trust.
   ```
   
   looks like there's now a sysprop which needs to be set. There's some 
implications there for testing sysprop needs to be set in execution or test 
setup.
   
   More importantly: mapreduce uses avro files in production. All uses of that 
code needs to be reviewed to make sure it isn't using standard object ser/deser 
as otherwise every runtime deployment of the services will need to set up a new 
sysprop -which is going to be an incompatible change


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