YARN-11253. Fix CheckStyle.

Author: slfan1989

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/resources/yarn-default.xml

@@ -1079,7 +1079,11 @@
 
   <property>
     <description>
-      RM delegation token remove-scan interval in ms
+      This configuration is used for
+      how often the tokens are scanned for expired tokens in milliseconds.
+      the background thread(delegation token remover thread)
+      will delete expired tokens after the configured time.
+      the default value is 1h.
     </description>
     <name>yarn.resourcemanager.delegation.token.remove-scan-interval</name>
     <value>1h</value>

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/RMSecretManagerService.java

@@ -138,8 +138,8 @@ protected RMDelegationTokenSecretManager createRMDelegationTokenSecretManager(
             YarnConfiguration.RM_DELEGATION_TOKEN_RENEW_INTERVAL_DEFAULT);
     long removeScanInterval =
         conf.getTimeDuration(YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_KEY,
-            YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_DEFAULT,
-                TimeUnit.MILLISECONDS);
+        YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_DEFAULT,
+        TimeUnit.MILLISECONDS);
 
     return new RMDelegationTokenSecretManager(secretKeyInterval,
         tokenMaxLifetime, tokenRenewInterval, removeScanInterval, rmContext);

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestClientRMTokens.java

@@ -127,8 +127,8 @@ public void testDelegationToken() throws Exception {
     long renewInterval = 10000l;
     long delegationTokenRemoverScanInterval =
         conf.getTimeDuration(YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_KEY,
-            YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_DEFAULT,
-                TimeUnit.MILLISECONDS);
+        YarnConfiguration.RM_DELEGATION_TOKEN_REMOVE_SCAN_INTERVAL_DEFAULT,
+        TimeUnit.MILLISECONDS);
 
     RMDelegationTokenSecretManager rmDtSecretManager = createRMDelegationTokenSecretManager(
         initialInterval, maxLifetime, renewInterval, delegationTokenRemoverScanInterval);