[GitHub] [hudi] sbernauer edited a comment on issue #1845: [SUPPORT] Support for Schema evolution. Facing an error

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sbernauer edited a comment on issue #1845:
URL: https://github.com/apache/hudi/issues/1845#issuecomment-662921730


   Hi @bvaradar,
   
   I've created a test using pure avro DataFileWriter to reproduce my DeltaStreamer-test and it kind of works.
   You can find it here https://github.com/sbernauer/avro-schema-evolution-test/blob/master/src/test/java/main/AvroSchemaEvolutionTest.java
   There is no exception, but the evoluted optional field is missing (Assertion https://github.com/sbernauer/avro-schema-evolution-test/blob/42e634bdcca9c996007566557c647c2785191e94/src/test/java/main/AvroSchemaEvolutionTest.java#L75).
   We can also check the generated avro file. So i assume, I'm currently not able to reproduce the error.
   ```
    java -jar avro-tools-1.8.2.jar tojson output.avro
   {"timestamp":0.0,"rider":"myRider0","driver":"myDriver0"}
   {"timestamp":1.0,"rider":"myRider1","driver":"myDriver1"}
   {"timestamp":2.0,"rider":"myRider2","driver":"myDriver2"}
   ```
   
   I found another post https://stackoverflow.com/questions/34733604/avro-schema-doesnt-honor-backward-compatibilty, it provides a testcase for schema evolution using a BinaryDecoder and reproduces the EOF exception.
   The mailing list entry http://apache-avro.679487.n3.nabble.com/AVRO-schema-evolution-adding-optional-column-with-default-fails-deserialization-td4043025.html describes the same problem but causes the ArrayIndexOutOfBoundsException.
   
   My setup is using avro 1.8.2.
   
   


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