Github user NiharS commented on a diff in the pull request:
https://github.com/apache/spark/pull/22192#discussion_r213820297
--- Diff: core/src/main/scala/org/apache/spark/executor/Executor.scala ---
@@ -130,6 +130,14 @@ private[spark] class Executor(
private val urlClassLoader = createClassLoader()
private val replClassLoader = addReplClassLoaderIfNeeded(urlClassLoader)
+ // Load plugins in the current thread, they are expected to not block.
+ // Heavy computation in plugin initialization should be done async.
+ Thread.currentThread().setContextClassLoader(replClassLoader)
+ conf.get(EXECUTOR_PLUGINS).foreach { classes =>
--- End diff --
`Utils.loadExtensions` expects `classes` to be a sequence of strings, it
gets mad at me if I add `.createWithDefault(Nil)` to the config
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