Ryan Skraba created BEAM-12628:
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Summary: AvroCoder changed underlying String class for
SpecificRecords
Key: BEAM-12628
URL: https://issues.apache.org/jira/browse/BEAM-12628
Project: Beam
Issue Type: Bug
Components: io-java-avro
Affects Versions: 2.30.0
Reporter: Ryan Skraba
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|https://lists.apache.org/x/thread.html/r5d0b975926cc4761f025ecd8df58a31e3f99e522296cc47d82ed5943@%3Cdev.beam.apache.org%3E]
and [PR|https://github.com/apache/beam/pull/14410#issuecomment-880838488])
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