Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9571#discussion_r67240208
--- Diff:
core/src/main/scala/org/apache/spark/deploy/history/ApplicationHistoryProvider.scala
---
@@ -110,3 +127,87 @@ private[history] abstract class
ApplicationHistoryProvider {
def writeEventLogs(appId: String, attemptId: Option[String], zipStream:
ZipOutputStream): Unit
}
+
+/**
+ * A simple counter of events.
+ * There is no concurrency support here: all events must come in
sequentially.
+ */
+private[history] class EventCountListener extends SparkListener {
--- End diff --
Isn't it easier to extend `SparkFirehoseListener` if all you're doing is
counting?
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