sandeep-katta opened a new pull request #26777: [SPARK-30134][SQL] Support DELETE JAR feature in SPARK URL: https://github.com/apache/spark/pull/26777 ### What changes were proposed in this pull request? Support DELETE JAR functionality in spark. On deletion the jar will be removed from the `IsolatedClientLoader` classpath and from `SharedState` classpath. It also removes the jar from `addedJars` map, so that next set of taskSet won't get these jars ### Why are the changes needed? If the jar definition is changed, use can delete the jar and add new one. This process does not require service to be restarted. Even Hive supports the DELETE jar feature. ### Does this PR introduce any user-facing change? Yes, new feature will be introduced to the user. Same will be updated in documentation as per the jira SPARK-30135 ### How was this patch tested? Added UT and also tested maually with the following testcases 1. Tested in spark-shell,spark-sql and beeline 2. With no schema like /opt/somepath/somejar.jar, hdfs 3. With fullpath or only with jarname 4. dropping invalid jar 5. Tested with Hive-2.3.6
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