Github user ajbozarth commented on a diff in the pull request:
https://github.com/apache/spark/pull/14673#discussion_r75218825
--- Diff: core/src/main/scala/org/apache/spark/ui/SparkUI.scala ---
@@ -141,6 +141,7 @@ private[spark] object SparkUI {
val DEFAULT_POOL_NAME = "default"
val DEFAULT_RETAINED_STAGES = 1000
val DEFAULT_RETAINED_JOBS = 1000
+ val DEFAULT_RETAINED_TASKS = 10000
--- End diff --
As for the why, the issue is when the history server is full of
applications with large task amounts, there is no issue with just one
application having a significant number of tasks by itself.
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