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https://issues.apache.org/jira/browse/SPARK-32988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17202793#comment-17202793
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Hyukjin Kwon commented on SPARK-32988:
--------------------------------------
`sharedState` is an unstable API that can be change between minor versions as
documneted.
> ExternalCatalog vs ExternalCatalogWithListener: backward compatibility
> problem
> -------------------------------------------------------------------------------
>
> Key: SPARK-32988
> URL: https://issues.apache.org/jira/browse/SPARK-32988
> Project: Spark
> Issue Type: Bug
> Components: Java API
> Affects Versions: 2.3.2, 2.4.0
> Reporter: dinesh
> Priority: Minor
>
> With Spark 2.3
> spark.sharedState.externalCatalog used to give an object of ExternalCatalog
> which was actually an instance of HiveExternalCatalog
> With Spark 2.4
> spark.sharedState.externalCatalog gives an object of
> ExternalCatalogWithListener which has HiveExternalCatalog as unwrapped
> delegate.
>
> We use HiveExternalCatalog to get HiveClient to perform Hive Operations.
>
>
> This change in method Signature is giving us backward compatibility problems
> such that code compiled with Spark 2.3 can not work with 2.4 due to the
> change. This results in Runtime exceptions including ClassCastException,
> NoSuchMethodError
>
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