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  1. Beam
  2. BEAM-12628

AvroCoder changed underlying String class for SpecificRecords

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P1
    • Resolution: Fixed
    • Affects Version/s: 2.30.0
    • Fix Version/s: 2.33.0
    • Component/s: io-java-avro
    • Labels:
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      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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              • Assignee:
                clairemcginty Claire McGinty
                Reporter:
                rskraba Ryan Skraba
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