Github user gzm0 commented on a diff in the pull request: https://github.com/apache/spark/pull/4130#discussion_r23546974 --- Diff: repl/src/main/scala/org/apache/spark/repl/ExecutorClassLoader.scala --- @@ -91,7 +91,14 @@ class ExecutorClassLoader(conf: SparkConf, classUri: String, parent: ClassLoader inputStream.close() Some(defineClass(name, bytes, 0, bytes.length)) } catch { - case e: Exception => None + case e: FileNotFoundException => + // We did not find the class + logDebug(s"Did not load class $name from REPL class server at $uri", e) --- End diff -- It is actually a remote URI: Have a look at the [usage site][1]. It can either point to an HTTP server or an HDFS. [1]: https://github.com/gzm0/spark/blob/4fa0582e90ebcf3cbc19971e26c8cda83d5613e1/repl/src/main/scala/org/apache/spark/repl/ExecutorClassLoader.scala#L47
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