Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/3029#discussion_r20468037
--- 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 {
+
+ // Update period of progress bar, in milli seconds
+ val UPDATE_PERIOD = 200L
+ // Delay to show up a progress bar, in milli seconds
+ val DELAY_SHOW_UP = 500L
+
+ // The width of terminal
+ val TerminalWidth = if (!sys.env.getOrElse("COLUMNS", "").isEmpty) {
+ sys.env.get("COLUMNS").get.toInt
+ } else {
+ 80
+ }
+
+ var hasShowed = false
+ var lastFinishTime = 0L
+
+ // Schedule a refresh thread to run in every 200ms
+ private val timer = new Timer("refresh progress", true)
+ timer.schedule(new TimerTask{
+ override def run() {
+ refresh()
+ }
+ }, DELAY_SHOW_UP, UPDATE_PERIOD)
+
+ /**
+ * Try to refresh the progress bar in every cycle
+ */
+ private def refresh(): Unit = synchronized {
+ val now = System.currentTimeMillis()
+ if (now - lastFinishTime < DELAY_SHOW_UP) {
+ return
+ }
+ val stageIds = sc.statusTracker.getActiveStageIds()
+ val stages =
stageIds.map(sc.statusTracker.getStageInfo).flatten.filter(_.numTasks() > 1)
+ .filter(now - _.submissionTime() > DELAY_SHOW_UP).sortBy(_.stageId())
+ if (stages.size > 0) {
+ show(stages.take(3)) // display at most 3 stages in same time
+ hasShowed = true
+ }
+ }
+
+ /**
+ * Show progress bar in console. The progress bar is displayed in the
next line
+ * after your last output, keeps overwriting itself to hold in one line.
The logging will follow
+ * the progress bar, then progress bar will be showed in next line
without overwrite logs.
+ */
+ private def show(stages: Seq[SparkStageInfo]) {
+ System.err.print("\r")
+ val width = TerminalWidth / stages.size
+ stages.foreach { s =>
+ val total = s.numTasks()
+ val header = s"[Stage ${s.stageId()}:"
+ val tailer = s"(${s.numCompletedTasks()} + ${s.numActiveTasks()}) /
$total]"
+ val w = width - header.size - tailer.size
+ val bar = if (w > 0) {
+ val percent = w * s.numCompletedTasks() / total
+ (0 until w).map { i =>
+ if (i < percent) "=" else if (i == percent) ">" else " "
+ }.mkString("")
+ } else {
+ ""
+ }
+ System.err.print(header + bar + tailer)
+ }
+ }
+
+ /**
+ * Clear the progress bar if showed.
+ */
+ private def clear() = {
+ if (hasShowed) {
+ System.err.printf("\r" + " " * TerminalWidth + "\r")
+ hasShowed = false
+ }
+ }
+
+ /**
+ * Mark all the stages as finished, clear the progress bar if showed,
then the progress will not
+ * interwave with output of jobs.
--- End diff --
interleave? interweave? I don't think interwave is a word
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