Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2471#discussion_r18935441
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/FsHistoryProvider.scala ---
@@ -46,8 +58,9 @@ private[history] class FsHistoryProvider(conf: SparkConf)
extends ApplicationHis
private val fs = Utils.getHadoopFileSystem(resolvedLogDir,
SparkHadoopUtil.get.newConfiguration(conf))
- // A timestamp of when the disk was last accessed to check for log
updates
- private var lastLogCheckTimeMs = -1L
+ // The schedule thread pool size must be one,otherwise it will have
concurrent issues about fs
+ // and applications between check task and clean task..
+ private val pool = Executors.newScheduledThreadPool(1)
--- End diff --
Ah, another thing: you should override `stop()` and shut down this executor
cleanly (it's mostly a "best effort" thing, but still).
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