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https://issues.apache.org/jira/browse/SPARK-20958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16043478#comment-16043478
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Cheng Lian commented on SPARK-20958:
------------------------------------
[~marmbrus], here is the draft release note entry:
{quote}
SPARK-20958: For users who use parquet-avro together with Spark 2.2, please use
parquet-avro 1.8.1 instead of parquet-avro 1.8.2. This is because parquet-avro
1.8.2 upgrades avro from 1.7.6 to 1.8.1, which is backward incompatible with
1.7.6.
{quote}
> 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
> Labels: release-notes, release_notes, releasenotes
>
> 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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