YARN-6646. Modifier 'static' is redundant for inner enums

(Contributed by ZhangBing Lin via Daniel Templeton)

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/timelineservice/TimelineMetric.java

@@ -43,7 +43,7 @@ public class TimelineMetric {
   /**
    * Type of metric.
    */
-  public static enum Type {
+  public enum Type {
     SINGLE_VALUE,
     TIME_SERIES
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-applications/hadoop-yarn-applications-distributedshell/src/main/java/org/apache/hadoop/yarn/applications/distributedshell/ApplicationMaster.java

@@ -179,13 +179,13 @@ public class ApplicationMaster {
 
   @VisibleForTesting
   @Private
-  public static enum DSEvent {
+  public enum DSEvent {
     DS_APP_ATTEMPT_START, DS_APP_ATTEMPT_END, DS_CONTAINER_START, DS_CONTAINER_END
   }
   
   @VisibleForTesting
   @Private
-  public static enum DSEntity {
+  public enum DSEntity {
     DS_APP_ATTEMPT, DS_CONTAINER
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-client/src/main/java/org/apache/hadoop/yarn/client/api/async/impl/NMClientAsyncImpl.java

@@ -406,7 +406,7 @@ public class NMClientAsyncImpl extends NMClientAsync {
     }
   }
 
-  protected static enum ContainerState {
+  protected enum ContainerState {
     PREP, FAILED, RUNNING, DONE,
   }
 
@@ -423,7 +423,7 @@ public class NMClientAsyncImpl extends NMClientAsync {
   /**
    * The type of the event of interacting with a container
    */
-  protected static enum ContainerEventType {
+  protected enum ContainerEventType {
     START_CONTAINER,
     STOP_CONTAINER,
     QUERY_CONTAINER,

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/ApplicationHistoryManagerOnTimelineStore.java

@@ -740,7 +740,7 @@ public class ApplicationHistoryManagerOnTimelineStore extends AbstractService
      }
    }
 
-  private static enum ApplicationReportField {
+  private enum ApplicationReportField {
     ALL, // retrieve all the fields
     USER_AND_ACLS // retrieve user and ACLs info only
   }

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/CMgrCompletedAppsEvent.java

@@ -43,7 +43,7 @@ public class CMgrCompletedAppsEvent extends ContainerManagerEvent {
     return reason;
   }
 
-  public static enum Reason {
+  public enum Reason {
     /**
      * Application is killed as NodeManager is shut down
      */

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/CMgrCompletedContainersEvent.java

@@ -42,7 +42,7 @@ public class CMgrCompletedContainersEvent extends ContainerManagerEvent {
     return reason;
   }
 
-  public static enum Reason {
+  public enum Reason {
     /**
      * Container is killed as NodeManager is shutting down
      */

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/NMAuditLogger.java

@@ -33,7 +33,7 @@ import org.apache.hadoop.yarn.api.records.ContainerId;
 public class NMAuditLogger {
   private static final Log LOG = LogFactory.getLog(NMAuditLogger.class);
 
-  static enum Keys {USER, OPERATION, TARGET, RESULT, IP, 
+  enum Keys {USER, OPERATION, TARGET, RESULT, IP,
                     DESCRIPTION, APPID, CONTAINERID}
 
   public static class AuditConstants {

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

@@ -37,7 +37,7 @@ import org.apache.hadoop.yarn.api.records.Resource;
 public class RMAuditLogger {
   private static final Log LOG = LogFactory.getLog(RMAuditLogger.class);
 
-  static enum Keys {USER, OPERATION, TARGET, RESULT, IP, PERMISSIONS,
+  enum Keys {USER, OPERATION, TARGET, RESULT, IP, PERMISSIONS,
                     DESCRIPTION, APPID, APPATTEMPTID, CONTAINERID, 
                     CALLERCONTEXT, CALLERSIGNATURE, RESOURCE}
 

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

@@ -118,7 +118,7 @@ public abstract class AbstractSystemMetricsPublisher extends CompositeService
   /**
    * EventType which is used while publishing the events.
    */
-  protected static enum SystemMetricsEventType {
+  protected enum SystemMetricsEventType {
     PUBLISH_ENTITY, PUBLISH_APPLICATION_FINISHED_ENTITY
   }
 

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-timelineservice/src/main/java/org/apache/hadoop/yarn/server/timelineservice/reader/filter/TimelineFilterList.java

@@ -41,7 +41,7 @@ public class TimelineFilterList extends TimelineFilter {
    */
   @Private
   @Unstable
-  public static enum Operator {
+  public enum Operator {
     AND,
     OR
   }