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[SPARK-32119][CORE] ExecutorPlugin doesn't work with Standalone Clust…
…er and Kubernetes with --jars ### What changes were proposed in this pull request? This PR changes Executor to load jars and files added by --jars and --files on Executor initialization. To avoid downloading those jars/files twice, they are assosiated with `startTime` as their uploaded timestamp. ### Why are the changes needed? ExecutorPlugin can't work with Standalone Cluster and Kubernetes when a jar which contains plugins and files used by the plugins are added by --jars and --files option with spark-submit. This is because jars and files added by --jars and --files are not loaded on Executor initialization. I confirmed it works with YARN because jars/files are distributed as distributed cache. ### Does this PR introduce _any_ user-facing change? Yes. jars/files added by --jars and --files are downloaded on each executor on initialization. ### How was this patch tested? Added a new testcase. Closes apache#28939 from sarutak/fix-plugin-issue. Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com> Signed-off-by: Mridul Muralidharan <mridul<at>gmail.com>
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