srowen commented on a change in pull request #28606:
URL: https://github.com/apache/spark/pull/28606#discussion_r429551102



##########
File path: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocatorBlacklistTracker.scala
##########
@@ -103,7 +103,16 @@ private[spark] class YarnAllocatorBlacklistTracker(
     refreshBlacklistedNodes()
   }
 
-  def isAllNodeBlacklisted: Boolean = currentBlacklistedYarnNodes.size >= 
numClusterNodes
+  def isAllNodeBlacklisted: Boolean = {
+    if (numClusterNodes <= 0) {
+      logWarn("There's no available nodes reported, please check Resource 
Manager.")
+      false
+    } else if (currentBlacklistedYarnNodes.size >= numClusterNodes) {
+      true

Review comment:
       if (x) true else false is redundant; just return the value of the 
predicate as before.

##########
File path: 
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocatorBlacklistTracker.scala
##########
@@ -103,7 +103,16 @@ private[spark] class YarnAllocatorBlacklistTracker(
     refreshBlacklistedNodes()
   }
 
-  def isAllNodeBlacklisted: Boolean = currentBlacklistedYarnNodes.size >= 
numClusterNodes
+  def isAllNodeBlacklisted: Boolean = {
+    if (numClusterNodes <= 0) {
+      logWarn("There's no available nodes reported, please check Resource 
Manager.")

Review comment:
       "There are", or just drop the first word.




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