YARN-11393. Fs2cs could be extended to set ULF to -1 upon conversion (#5201)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/converter/FSQueueConverter.java

@@ -17,12 +17,15 @@
 package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter;
 
 import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.DOT;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.USER_LIMIT_FACTOR;
 
 import java.util.List;
 import java.util.stream.Collectors;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.yarn.api.records.Resource;
+import org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.ConfigurableResource;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSLeafQueue;
 import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.FSQueue;
@@ -79,6 +82,7 @@ public void convertQueueHierarchy(FSQueue queue) {
     emitMaxParallelApps(queueName, queue);
     emitMaxAllocations(queueName, queue);
     emitPreemptionDisabled(queueName, queue);
+    emitDefaultUserLimitFactor(queueName, children);
 
     emitChildCapacity(queue);
     emitMaximumCapacity(queueName, queue);
@@ -215,6 +219,15 @@ private void emitPreemptionDisabled(String queueName, FSQueue queue) {
     }
   }
 
+  public void emitDefaultUserLimitFactor(String queueName, List<FSQueue> children) {
+    if (children.isEmpty()) {
+      capacitySchedulerConfig.setFloat(
+              CapacitySchedulerConfiguration.
+                      PREFIX + queueName + DOT + USER_LIMIT_FACTOR,
+              -1.0f);
+    }
+  }
+
   /**
    * yarn.scheduler.fair.sizebasedweight ==>
    * yarn.scheduler.capacity.&lt;queue-path&gt;

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/converter/TestFSConfigToCSConfigConverter.java

@@ -17,6 +17,7 @@
 package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter;
 
 import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.PREFIX;
+import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacitySchedulerConfiguration.USER_LIMIT_FACTOR;
 import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter.FSConfigToCSConfigRuleHandler.DYNAMIC_MAX_ASSIGN;
 import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter.FSConfigToCSConfigRuleHandler.MAX_CAPACITY_PERCENTAGE;
 import static org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.converter.FSConfigToCSConfigRuleHandler.MAX_CHILD_CAPACITY;
@@ -182,7 +183,26 @@ public void testDefaultMaxAMShare() throws Exception {
         conf.get(PREFIX + "root.admins.alice.maximum-am-resource-percent"));
 
     assertNull("root.users.joe maximum-am-resource-percent should be null",
-        conf.get(PREFIX + "root.users.joe maximum-am-resource-percent"));
+        conf.get(PREFIX + "root.users.joe.maximum-am-resource-percent"));
+  }
+
+  @Test
+  public void testDefaultUserLimitFactor() throws Exception {
+    converter.convert(config);
+
+    Configuration conf = converter.getCapacitySchedulerConfig();
+
+    assertNull("root.users user-limit-factor should be null",
+            conf.get(PREFIX + "root.users." + USER_LIMIT_FACTOR));
+
+    assertEquals("root.default user-limit-factor", "-1.0",
+            conf.get(PREFIX + "root.default.user-limit-factor"));
+
+    assertEquals("root.users.joe user-limit-factor", "-1.0",
+            conf.get(PREFIX + "root.users.joe.user-limit-factor"));
+
+    assertEquals("root.admins.bob user-limit-factor", "-1.0",
+            conf.get(PREFIX + "root.admins.bob.user-limit-factor"));
   }
 
   @Test