Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/17163
Looking @ hadoop source, there's not much in hadoop common terms of use of
`import org.apache.avro`, ut the `avro.Utf8` surfaces, and someone has tagged
`fs.Path` as `@Stringable`, which is a pain; makes it a core dependency of the
code.
Otherwise, the MR job client has a file
`hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/avro/Events.avpr`
which contains the avro schemas for job history. The biggest risk is going to
be whether or not avro is backwards compatible with generated classes. I know
protobuf isn't; don't know about about Avro...you'll need to ask around there.
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