I have asked similar question but regarding deserialization of such records
written as Bytes.
Did you try to deserilize them ?
What does your schemaString look like?

Please refer to thread : Avro Byte Blob Ser
De<https://mail-archives.apache.org/mod_mbox/avro-user/201402.mbox/%[EMAIL PROTECTED]%3e>

On Fri, Feb 7, 2014 at 7:29 PM, Daniel Rodriguez
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