Github user witgo commented on a diff in the pull request: https://github.com/apache/spark/pull/15505#discussion_r93558564 --- 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 -- LocalEndpoint does not support multiple threads,the ThreadLocal is not necessary.
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