Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/18430#discussion_r124250562
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
@@ -122,7 +123,7 @@ private[history] class FsHistoryProvider(conf:
SparkConf, clock: Clock)
@volatile private var applications: mutable.LinkedHashMap[String,
FsApplicationHistoryInfo]
= new mutable.LinkedHashMap()
- val fileToAppInfo = new mutable.HashMap[Path, FsApplicationAttemptInfo]()
+ val fileToAppInfo = new java.util.concurrent.ConcurrentHashMap[Path,
FsApplicationAttemptInfo]()
--- End diff --
Import this class
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