Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/42#discussion_r10457836
--- Diff:
core/src/main/scala/org/apache/spark/ui/jobs/JobProgressListener.scala ---
@@ -30,16 +32,23 @@ import org.apache.spark.scheduler._
* class, since the UI thread and the DAGScheduler event loop may otherwise
* be reading/updating the internal data structures concurrently.
--- End diff --
Not sure... though it appears that you wrote this comment a while back. You
could imagine a case in which the user refreshes the browser, which reads from
these data structures, while the SparkListenerBus thread is updating them
through an event, leading to inconsistent state reported on the UI.
However, other UI listeners do not synchronize on their data structures,
and I haven't observed a concurrency issue.
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