YARN-8184. Too many metrics if containerLocalizer/ResourceLocalizationService uses ReadWriteDiskValidator. Contributed by Yufei Gu

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/ContainerLocalizer.java

@@ -132,10 +132,7 @@ public class ContainerLocalizer {
     this.recordFactory = recordFactory;
     this.conf = new YarnConfiguration();
     this.diskValidator = DiskValidatorFactory.getInstance(
-        conf.get(YarnConfiguration.DISK_VALIDATOR,
-            YarnConfiguration.DEFAULT_DISK_VALIDATOR));
-    LOG.info("Disk Validator: " + YarnConfiguration.DISK_VALIDATOR +
-        " is loaded.");
+        YarnConfiguration.DEFAULT_DISK_VALIDATOR);
     this.appCacheDirContextName = String.format(APPCACHE_CTXT_FMT, appId);
     this.pendingResources = new HashMap<LocalResource,Future<Path>>();
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/localizer/ResourceLocalizationService.java

@@ -264,10 +264,7 @@ public class ResourceLocalizationService extends CompositeService
     }
 
     diskValidator = DiskValidatorFactory.getInstance(
-        conf.get(YarnConfiguration.DISK_VALIDATOR,
-            YarnConfiguration.DEFAULT_DISK_VALIDATOR));
-    LOG.info("Disk Validator: " + YarnConfiguration.DISK_VALIDATOR +
-        " is loaded.");
+        YarnConfiguration.DEFAULT_DISK_VALIDATOR);
     cacheTargetSize =
       conf.getLong(YarnConfiguration.NM_LOCALIZER_CACHE_TARGET_SIZE_MB, YarnConfiguration.DEFAULT_NM_LOCALIZER_CACHE_TARGET_SIZE_MB) << 20;
     cacheCleanupPeriod =