diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/FederationStateStore.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/FederationStateStore.java
index 3949767d81..e197339671 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/FederationStateStore.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/FederationStateStore.java
@@ -37,8 +37,7 @@ public interface FederationStateStore extends
     FederationPolicyStore, FederationReservationHomeSubClusterStore,
     FederationDelegationTokenStateStore {
 
-  public static final Logger LOG =
-      LoggerFactory.getLogger(FederationStateStore.class);
+  Logger LOG = LoggerFactory.getLogger(FederationStateStore.class);
 
   /**
    * Initialize the FederationStore.
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/MemoryFederationStateStore.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/MemoryFederationStateStore.java
index 1cf07075fd..d2d6453635 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/MemoryFederationStateStore.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/MemoryFederationStateStore.java
@@ -42,7 +42,6 @@
 import org.apache.hadoop.yarn.conf.YarnConfiguration;
 import org.apache.hadoop.yarn.exceptions.YarnException;
 import org.apache.hadoop.yarn.server.federation.store.FederationStateStore;
-import org.apache.hadoop.yarn.server.federation.store.exception.FederationStateVersionIncompatibleException;
 import org.apache.hadoop.yarn.server.federation.store.metrics.FederationStateStoreClientMetrics;
 import org.apache.hadoop.yarn.server.federation.store.records.AddApplicationHomeSubClusterRequest;
 import org.apache.hadoop.yarn.server.federation.store.records.AddApplicationHomeSubClusterResponse;
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/ZookeeperFederationStateStore.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/ZookeeperFederationStateStore.java
index ca0a87112b..7a1511496c 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/ZookeeperFederationStateStore.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/store/impl/ZookeeperFederationStateStore.java
@@ -45,7 +45,6 @@
 import org.apache.hadoop.yarn.proto.YarnServerCommonProtos.VersionProto;
 import org.apache.hadoop.yarn.security.client.YARNDelegationTokenIdentifier;
 import org.apache.hadoop.yarn.server.federation.store.FederationStateStore;
-import org.apache.hadoop.yarn.server.federation.store.exception.FederationStateVersionIncompatibleException;
 import org.apache.hadoop.yarn.server.federation.store.records.AddApplicationHomeSubClusterRequest;
 import org.apache.hadoop.yarn.server.federation.store.records.AddApplicationHomeSubClusterResponse;
 import org.apache.hadoop.yarn.server.federation.store.records.ApplicationHomeSubCluster;
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/FederationStateStoreBaseTest.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/FederationStateStoreBaseTest.java
index 08de34552a..ad09c03aaa 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/FederationStateStoreBaseTest.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/FederationStateStoreBaseTest.java
@@ -26,7 +26,6 @@
 import java.util.HashSet;
 import java.util.TimeZone;
 
-import org.apache.commons.lang3.NotImplementedException;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.token.delegation.DelegationKey;
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestMemoryFederationStateStore.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestMemoryFederationStateStore.java
index 3db5c56fce..5548dab1b8 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestMemoryFederationStateStore.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestMemoryFederationStateStore.java
@@ -27,8 +27,6 @@
 import org.apache.hadoop.yarn.server.federation.store.records.RouterMasterKey;
 import org.apache.hadoop.yarn.server.federation.store.records.RouterRMDTSecretManagerState;
 import org.apache.hadoop.yarn.server.federation.store.records.RouterStoreToken;
-import org.apache.hadoop.yarn.server.records.Version;
-import org.junit.Test;
 
 import java.io.IOException;
 import java.nio.ByteBuffer;
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestZookeeperFederationStateStore.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestZookeeperFederationStateStore.java
index 5542453b20..ba22a1e189 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestZookeeperFederationStateStore.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/test/java/org/apache/hadoop/yarn/server/federation/store/impl/TestZookeeperFederationStateStore.java
@@ -41,7 +41,6 @@
 import org.apache.hadoop.yarn.server.federation.store.records.RouterMasterKeyRequest;
 import org.apache.hadoop.yarn.server.federation.store.records.RouterMasterKeyResponse;
 import org.apache.hadoop.yarn.server.federation.store.records.RouterStoreToken;
-import org.apache.hadoop.yarn.server.records.Version;
 import org.apache.hadoop.yarn.util.Records;
 import org.junit.After;
 import org.junit.Before;
@@ -53,7 +52,6 @@
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
 
 /**
  * Unit tests for ZookeeperFederationStateStore.