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https://issues.apache.org/jira/browse/SPARK-20958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16035149#comment-16035149
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Cheng Lian commented on SPARK-20958:
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Thanks [~rdblue]! I'm also reluctant to roll it back considering those fixes we
wanted so badly... We decided to give this a try because, from the perspective
of release management, we'd like to avoid cutting a release with known
conflicting dependencies, even transitive ones. For a Spark 2.2 user, it's
quite natural to choose parquet-avro 1.8.2, which is part of parquet-mr 1.8.2,
which in turn, is a direct dependency of Spark 2.2.0.
However, due to PARQUET-389, rolling back is already not an option. Two options
I can see here are:
# Release Spark 2.2.0 as is with a statement in the release notes saying that
users should use parquet-avro 1.8.1 instead of 1.8.2 to avoid the Avro
compatibility issue.
# Wait for parquet-mr 1.8.3, which hopefully resolves this dependency issue
(e.g., by reverting PARQUET-358).
> Roll back parquet-mr 1.8.2 to parquet-1.8.1
> -------------------------------------------
>
> Key: SPARK-20958
> URL: https://issues.apache.org/jira/browse/SPARK-20958
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Cheng Lian
> Assignee: Cheng Lian
>
> We recently realized that parquet-mr 1.8.2 used by Spark 2.2.0-rc2 depends on
> avro 1.8.1, which is incompatible with avro 1.7.6 used by parquet-mr 1.8.1
> and avro 1.7.7 used by spark-core 2.2.0-rc2.
> Basically, Spark 2.2.0-rc2 introduced two incompatible versions of avro
> (1.7.7 and 1.8.1). Upgrading avro 1.7.7 to 1.8.1 is not preferable due to the
> reasons mentioned in [PR
> #17163|https://github.com/apache/spark/pull/17163#issuecomment-286563131].
> Therefore, we don't really have many choices here and have to roll back
> parquet-mr 1.8.2 to 1.8.1 to resolve this dependency conflict.
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