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https://issues.apache.org/jira/browse/BEAM-12628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416831#comment-17416831
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Udi Meiri commented on BEAM-12628:
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I'm leaning towards the minimal amount of backwards compatibility breaking
changes
1 .From what I can tell, the release notes (CHANGES.md) for Beam 2.30.0 did not
mention the change to SpecificRecords. I think we should at least correct that.
2. We could switch the default back, but that would break compatibility a
second time. [~clairemcginty] does the fix to add serialization in
https://issues.apache.org/jira/browse/AVRO-3208 solve your issues, or will you
still need to set useReflectApi?
> 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
> Assignee: Claire McGinty
> Priority: P1
> Fix For: 2.33.0
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> 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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