Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/8100#discussion_r42926909
--- Diff:
yarn/src/main/scala/org/apache/spark/deploy/yarn/LocalityPreferredContainerPlacementStrategy.scala
---
@@ -179,4 +197,30 @@ private[yarn] class
LocalityPreferredContainerPlacementStrategy(
(host, math.max(0, (expectedCount - existedCount).ceil.toInt))
}
}
+
+ /**
+ * Calculate the host to possible number of containers for pending
allocation containers.
+ * @param hostToLocalTaskCount a map to store the preferred hostname and
possible task
+ * numbers running on it, used as hints for
container allocation
+ * @param localityMatchedPendingAllocations A sequence of pending
container request which
+ * matches the localities of
current required tasks.
+ * @return a Map with hostname as key and possible number of containers
on this host as value
+ */
+ private def pendingAllocationHostToContainerCount(
+ hostToLocalTaskCount: Map[String, Int],
--- End diff --
This parameter is not used.
---
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