Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22192#discussion_r212746543
--- Diff: core/src/main/scala/org/apache/spark/executor/Executor.scala ---
@@ -130,6 +130,16 @@ private[spark] class Executor(
private val urlClassLoader = createClassLoader()
private val replClassLoader = addReplClassLoaderIfNeeded(urlClassLoader)
+ // One thread will handle loading all of the plugins on this executor
--- End diff --
Why a thread? This risks having the executor start doing things before
plugins have had a chance of properly starting up.
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