Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/15505#discussion_r93077759
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/local/LocalSchedulerBackend.scala
---
@@ -59,6 +62,12 @@ private[spark] class LocalEndpoint(
private val executor = new Executor(
localExecutorId, localExecutorHostname, SparkEnv.get, userClassPath,
isLocal = true)
+ private val serializer = new ThreadLocal[SerializerInstance] {
--- End diff --
why the ThreadLocal here, but not for CoarseGrainedSchedulerBackend? Is
this unrelated to this change? If not, can you add a comment explaining
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