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  1. Beam
  2. BEAM-12628

AvroCoder changed underlying String class for SpecificRecords

Details

    • Bug
    • Status: Resolved
    • P1
    • Resolution: Fixed
    • 2.30.0
    • 2.33.0
    • io-java-avro
    • None

    Description

      The AvroCoder changes for BEAM-2303 changes the reader/writer from the Avro ReflectDatum* classes to the SpecificDatum* classes.

      Because of the way Avro handles Strings, however, the underlying instances for String data are deserialised as org.apache.avro.util.Utf8 instances instead of java.lang.String.

      This causes:
      1. an unexpected behaviour change when migrating to Beam 2.30.0
      2. potential serialization issues when using these String instances (Utf8 instances don't implement Serializable)
      3. an inconsistent API between AvroCoder and AvroSink/AvroSource (the latter still use ReflectDatum*)

      (Original report on the mailing list and PR)

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              clairemcginty Claire McGinty
              rskraba Ryan Skraba
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