xuanyuanking opened a new pull request #25849: [SPARK-29175][SQL] Make maven central repository in IsolatedClientLoader configurable URL: https://github.com/apache/spark/pull/25849 ### What changes were proposed in this pull request? Added a new config "spark.central.repository", with maven central repository "https://repo1.maven.org/maven2"; as its default value. ### Why are the changes needed? We need to connect a central repository in IsolatedClientLoader for downloading Hive jars. The repository currently used is "http://www.datanucleus.org/downloads/maven2";, which is no longer maintained. This will sometimes cause downloading failure and make hive test cases flaky. End users can also set this config to the central repository they want to access. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Existing UT.
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