Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/3029#discussion_r20468644
--- Diff: core/src/main/scala/org/apache/spark/ui/ConsoleProgressBar.scala
---
@@ -0,0 +1,115 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.ui
+
+import java.util.{Timer, TimerTask}
+
+import org.apache.spark._
+
+/**
+ * ConsoleProgressBar shows the progress of stages in the next line of the
console. It poll the
+ * status of active stages from `sc.statusTracker` in every 200ms, the
progress bar will be showed
+ * up after the stage has ran at least 500ms. If multiple stages run in
the same time, the status
+ * of them will be combined together, showed in one line.
+ */
+private[spark] class ConsoleProgressBar(sc: SparkContext) extends Logging {
--- End diff --
Right now, it only depends on statusTracker, but it may show some metrics
later, so it's better to have `SparkContext` here.
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