### Question:
FairScheduler extends
    AbstractYarnScheduler<FSAppAttempt, FSSchedulerNode> { @Override public void serviceInit(Configuration conf) throws Exception { initScheduler(conf); super.serviceInit(conf); } FairScheduler(); FairSchedulerConfiguration getConf(); QueueManager getQueueManager(); synchronized RMContainerTokenSecretManager getContainerTokenSecretManager(); synchronized ResourceWeights getAppWeight(FSAppAttempt app); Resource getIncrementResourceCapability(); double getNodeLocalityThreshold(); double getRackLocalityThreshold(); long getNodeLocalityDelayMs(); long getRackLocalityDelayMs(); boolean isContinuousSchedulingEnabled(); synchronized int getContinuousSchedulingSleepMs(); Clock getClock(); FairSchedulerEventLog getEventLog(); @Override Allocation allocate(ApplicationAttemptId appAttemptId,
      List<ResourceRequest> ask, List<ContainerId> release,
      List<String> blacklistAdditions, List<String> blacklistRemovals); FSAppAttempt getSchedulerApp(ApplicationAttemptId appAttemptId); @Override ResourceCalculator getResourceCalculator(); @Override QueueMetrics getRootQueueMetrics(); @Override void handle(SchedulerEvent event); @Override void recover(RMState state); synchronized void setRMContext(RMContext rmContext); @Override void serviceInit(Configuration conf); @Override void serviceStart(); @Override void serviceStop(); @Override void reinitialize(Configuration conf, RMContext rmContext); @Override QueueInfo getQueueInfo(String queueName, boolean includeChildQueues,
      boolean recursive); @Override List<QueueUserACLInfo> getQueueUserAclInfo(); @Override int getNumClusterNodes(); @Override synchronized boolean checkAccess(UserGroupInformation callerUGI,
      QueueACL acl, String queueName); AllocationConfiguration getAllocationConfiguration(); @Override List<ApplicationAttemptId> getAppsInQueue(String queueName); @Override synchronized String moveApplication(ApplicationId appId,
      String queueName); @Override synchronized void updateNodeResource(RMNode nm, 
      ResourceOption resourceOption); @Override EnumSet<SchedulerResourceTypes> getSchedulingResourceTypes(); @Override Set<String> getPlanQueues(); @Override void setEntitlement(String queueName,
      QueueEntitlement entitlement); @Override void removeQueue(String queueName); static final Resource CONTAINER_RESERVED; }### Answer:
@Test (timeout = 30000) public void testConfValidation() throws Exception { scheduler = new FairScheduler(); Configuration conf = new YarnConfiguration(); conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, 2048); conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB, 1024); try { scheduler.serviceInit(conf); fail("Exception is expected because the min memory allocation is" + " larger than the max memory allocation."); } catch (YarnRuntimeException e) { assertTrue("The thrown exception is not the expected one.", e.getMessage().startsWith( "Invalid resource scheduler memory")); } conf = new YarnConfiguration(); conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_VCORES, 2); conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_VCORES, 1); try { scheduler.serviceInit(conf); fail("Exception is expected because the min vcores allocation is" + " larger than the max vcores allocation."); } catch (YarnRuntimeException e) { assertTrue("The thrown exception is not the expected one.", e.getMessage().startsWith( "Invalid resource scheduler vcores")); } conf = new YarnConfiguration(); conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_GCORES, 2); conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_GCORES, 1); try { scheduler.serviceInit(conf); fail("Exception is expected because the min gcores allocation is" + " larger than the max gcores allocation."); } catch (YarnRuntimeException e) { assertTrue("The thrown exception is not the expected one.", e.getMessage().startsWith( "Invalid resource scheduler gcores")); } }