Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22192#discussion_r213790939
--- 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.
--- End diff --
This comment makes more sense in the API doc, not here.
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