Github user lirui-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/892#discussion_r13474171
--- Diff:
core/src/main/scala/org/apache/spark/scheduler/TaskSetManager.scala ---
@@ -182,15 +189,16 @@ private[spark] class TaskSetManager(
for (loc <- tasks(index).preferredLocations) {
for (execId <- loc.executorId) {
if (sched.isExecutorAlive(execId)) {
- addTo(pendingTasksForExecutor.getOrElseUpdate(execId, new
ArrayBuffer))
hadAliveLocations = true
--- End diff --
This check is used when we add a task to pending lists. If the task has any
preferred location available (executor / host / rack), we won't add it to
pendingTasksWithNoPrefs. Do you mean check for executor and host is redundant?
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