YARN-10860. Make max container per heartbeat configs refreshable. Contributed by Eric Badger.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/CapacityScheduler.java

@@ -393,7 +393,10 @@ void initScheduler(Configuration configuration) throws
           + getMaximumResourceCapability() + ", " + "asynchronousScheduling="
           + scheduleAsynchronously + ", " + "asyncScheduleInterval="
           + asyncScheduleInterval + "ms" + ",multiNodePlacementEnabled="
-          + multiNodePlacementEnabled);
+          + multiNodePlacementEnabled + ", " + "assignMultipleEnabled="
+          + assignMultipleEnabled + ", " + "maxAssignPerHeartbeat="
+          + maxAssignPerHeartbeat + ", " + "offswitchPerHeartbeatLimit="
+          + offswitchPerHeartbeatLimit);
     } finally {
       writeLock.unlock();
     }
@@ -485,8 +488,14 @@ public void reinitialize(Configuration newConf, RMContext rmContext,
         this.isLazyPreemptionEnabled = this.conf.getLazyPreemptionEnabled();
 
         // Setup how many containers we can allocate for each round
+        assignMultipleEnabled = this.conf.getAssignMultipleEnabled();
+        maxAssignPerHeartbeat = this.conf.getMaxAssignPerHeartbeat();
         offswitchPerHeartbeatLimit = this.conf.getOffSwitchPerHeartbeatLimit();
 
+        LOG.info("assignMultipleEnabled = " + assignMultipleEnabled + "\n" +
+            "maxAssignPerHeartbeat = " + maxAssignPerHeartbeat + "\n" +
+            "offswitchPerHeartbeatLimit = " + offswitchPerHeartbeatLimit);
+
         super.reinitialize(newConf, rmContext);
       }
       maxRunningEnforcer.updateRunnabilityOnReload();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/markdown/CapacityScheduler.md

@@ -702,7 +702,7 @@ Note, this feature should be disabled if YARN is deployed separately with the fi
 
   * Container Allocation per NodeManager Heartbeat
 
-  The `CapacityScheduler` supports the following parameters to control how many containers can be allocated in each NodeManager heartbeat.
+  The `CapacityScheduler` supports the following parameters to control how many containers can be allocated in each NodeManager heartbeat. These parameters are refreshable via *yarn rmadmin -refreshQueues*.
 
 | Property | Description |
 |:---- |:---- |