Alperen Koksel created AVRO-2591:
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             Summary: Getting error when reading avro message python
                 Key: AVRO-2591
                 URL: https://issues.apache.org/jira/browse/AVRO-2591
             Project: Apache Avro
          Issue Type: Bug
          Components: python
    Affects Versions: 1.9.1
         Environment: Windows
            Reporter: Alperen Koksel


I can't read avro messages in python in windows environment. 
We 're using avro templates on kafka. I get the avro serialized message using 
kafkaconsumer but I can't deserialize using avro.io.

 
{code:java}
// code placeholder
schema_path = "x.avsc"
schema = avro.schema.Parse(open(schema_path).read())


def from_avro(msg):
    bytes_reader = io.BytesIO(msg)
    decoder = avro.io.BinaryDecoder(bytes_reader)
    reader = avro.io.DatumReader(schema, schema)
    user1 = reader.read(decoder)
    return user1


consumer = KafkaConsumer('avro_topic',
                         bootstrap_servers=['0.dual.kafka.qa-us.com:9092',
                                            '1.dual.kafka.qa-us.com:9092',
                                            '2.dual.kafka.qa-us.com:9092'],
                         auto_offset_reset='earliest',
                         group_id='my_group',
                         value_deserializer=from_avro
                         )


for msg in consumer:
    print(msg){code}
 
{code:java}
// code placeholder
File "C:\Users\alpl\PycharmProjects\WorkOn\venv\lib\site-packages\avro\io.py", 
line 240, in read_bytes
 assert (nbytes >= 0), nbytes
AssertionError: -45
{code}
 

I found following stackoverflow post which posted more than a year ago.

[https://stackoverflow.com/questions/50106662/error-reading-avro-file-in-python/58336209#58336209]

I tried several versions of avro. Results are same.

 



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