Added note to explain use of ConcurrentHashMap

apache · Dec 15, 2015 · 04501a0 · 04501a0
1 parent 90402d7
commit 04501a0
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/core/src/main/scala/org/apache/spark/deploy/master/Master.scala b/core/src/main/scala/org/apache/spark/deploy/master/Master.scala
@@ -84,6 +84,7 @@ private[deploy] class Master(
   private val addressToApp = new HashMap[RpcAddress, ApplicationInfo]
   private val completedApps = new ArrayBuffer[ApplicationInfo]
   private var nextAppNumber = 0
+  // Using ConcurrentHashMap so that master-rebuild-ui-thread can add a UI after asyncRebuildUI
   private val appIdToUI = new ConcurrentHashMap[String, SparkUI]
 
   private val drivers = new HashSet[DriverInfo]