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

@@ -368,7 +368,10 @@ public class CapacityScheduler extends
           + getMinimumResourceCapability() + ">, " + "maximumAllocation=<"
           + getMaximumResourceCapability() + ">, " + "asynchronousScheduling="
           + scheduleAsynchronously + ", " + "asyncScheduleInterval="
-          + asyncScheduleInterval + "ms");
+          + asyncScheduleInterval + "ms" + ", " + "assignMultipleEnabled="
+          + assignMultipleEnabled + ", " + "maxAssignPerHeartbeat="
+          + maxAssignPerHeartbeat + ", " + "offswitchPerHeartbeatLimit="
+          + offswitchPerHeartbeatLimit);
     } finally {
       writeLock.unlock();
     }
@@ -453,7 +456,13 @@ public class CapacityScheduler extends
       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);
     } finally {
       writeLock.unlock();
     }

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

@@ -285,7 +285,7 @@ The `ReservationSystem` is integrated with the `CapacityScheduler` queue hierach
 
   * 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 |
 |:---- |:---- |