Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2471#discussion_r18737405
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
@@ -195,22 +241,68 @@ private[history] class FsHistoryProvider(conf:
SparkConf) extends ApplicationHis
}
}
- val newIterator = logInfos.iterator.buffered
- val oldIterator = applications.values.iterator.buffered
- while (newIterator.hasNext && oldIterator.hasNext) {
- if (newIterator.head.endTime > oldIterator.head.endTime) {
- addIfAbsent(newIterator.next)
- } else {
- addIfAbsent(oldIterator.next)
+ applications.synchronized {
--- End diff --
There isn't a need to synchronize on `applications` (here nor in the other
method). The idea is that you create the new list and atomically replace the
old one (note how it's `volatile`).
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