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https://issues.apache.org/jira/browse/AVRO-2126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16952827#comment-16952827
]
Alperen Koksel commented on AVRO-2126:
--------------------------------------
[~pederpansen] In my case I overcame ''Can't access branch index' with by first
decoding the message to b64. But now I got tuple index out of range error.
[~ryanskraba]
I believe he 's using python-kafka and using avro.io library to deserialize.
I'm using similar structure.
I think it shouldn't matter because confluent kafka library is also using
avro.io library to deserialize.
It should look like this..
{code:java}
// schema_path = "users.avsc"
schema = avro.schema.Parse(open(schema_path).read())
def from_avro(msg):
msg_decoded=base64.b64decode(msg.decode('ascii'))
bytes_reader = io.BytesIO(msg_decoded)
decoder = avro.io.BinaryDecoder(bytes_reader)
reader = avro.io.DatumReader(schema, schema)
user1 = reader.read(decoder)
return user1
consumer = KafkaConsumer('topic_name_here',
bootstrap_servers=['0.serveraddress.com:9092',
'1.serveraddress.com:9092',
'2.serveraddress.com:9092'],
auto_offset_reset='earliest',
group_id='my_group',
value_deserializer=from_avro
)
for msg in consumer:
print(msg)
{code}
> avro.io.SchemaResolutionException: Can't access branch index 36 for union
> with 2 branches
> -----------------------------------------------------------------------------------------
>
> Key: AVRO-2126
> URL: https://issues.apache.org/jira/browse/AVRO-2126
> Project: Apache Avro
> Issue Type: Bug
> Components: python
> Affects Versions: 1.8.2
> Environment: Python 3.5.2, avro-python3 1.8.2
> Reporter: Jurgis Pods
> Priority: Major
>
> I get the following error when decoding messages from Kafka via avro-python3:
> {code}
> avro.io.SchemaResolutionException: Can't access branch index 36 for union
> with 2 branches
> Writer's Schema: [
> "null",
> "string"
> ]
> Reader's Schema: [
> "null",
> "string"
> ]
> {code}
> Relevant code producing this error:
> {code}
> import avro.schema
> import avro.io
> import io
> def parse_avro(value, schema):
> bytes_reader = io.BytesIO(value)
> decoder = avro.io.BinaryDecoder(bytes_reader)
> reader = avro.io.DatumReader(schema)
> return reader.read(decoder)
> # msg: Message from Kafka, schema: avro.schema.Schema from Confluent Schema
> Registry
> parse_avro(msg.value, avro_schema)
> {code}
> I have no idea where the number 36 might come from.
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