David Beswick created AVRO-2432:
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             Summary: Python 3: AssertionError on reading "empty" file
                 Key: AVRO-2432
                 URL: https://issues.apache.org/jira/browse/AVRO-2432
             Project: Apache Avro
          Issue Type: Bug
          Components: python
    Affects Versions: 1.9.0
            Reporter: David Beswick
         Attachments: 28.avro

I've seen this problem with the pip package avro-python3. An AssertionError is 
thrown on reading certain unusual files.

Problematic files seem to have these characteristics:

* The file is read without issue by avro-tools
* Normal, correct header with sync token
* Zero records (first block_count read is zero)
* A sync token follows the zero block_count long, then EOF

An example file is attached.

Repro code (nothing special):

{code:python}
from avro.datafile import DataFileReader
from avro.io import DatumReader

with DataFileReader(open("28.avro", 'rb'), DatumReader()) as r:
    for rec in r:
        print(rec)
{code}




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