Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/22001#discussion_r208065660
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -1597,6 +1597,15 @@ class SparkContext(config: SparkConf) extends
Logging {
}
}
+ /**
+ * Get the number of currently active slots (total number of tasks can
be launched currently).
+ * Note that please don't cache the value returned by this method,
because the number can change
+ * due to add/remove executors.
+ *
+ * @return The number of tasks can be launched currently.
+ */
+ private[spark] def getNumSlots(): Int = schedulerBackend.getNumSlots()
--- End diff --
How about `maxConcurrentTasks`?
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