Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5886#discussion_r29671477
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
@@ -319,6 +318,15 @@ private[history] class FsHistoryProvider(conf:
SparkConf, clock: Clock)
applications = appsToRetain
+ val modifiedTimesToRetain = new mutable.LinkedHashMap[String, Long]()
--- End diff --
What about simply deleting the entries that are too old? then the member
can be `val` and doesn't need to be `@volatile`
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