diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java
index ca08992615d..42da86acc9b 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/CoprocessorHost.java
@@ -459,49 +459,6 @@ public abstract class CoprocessorHost<C extends Coprocessor, E extends Coprocess
     }
   }
 
-  /**
-   * Used to gracefully handle fallback to deprecated methods when we
-   * evolve coprocessor APIs.
-   *
-   * When a particular Coprocessor API is updated to change methods, hosts can support fallback
-   * to the deprecated API by using this method to determine if an instance implements the new API.
-   * In the event that said support is partial, then in the face of a runtime issue that prevents
-   * proper operation {@link #legacyWarning(Class, String)} should be used to let operators know.
-   *
-   * For examples of this in action, see the implementation of
-   * <ul>
-   *   <li>{@link org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost}
-   *   <li>{@link org.apache.hadoop.hbase.regionserver.wal.WALCoprocessorHost}
-   * </ul>
-   *
-   * @param clazz Coprocessor you wish to evaluate
-   * @param methodName the name of the non-deprecated method version
-   * @param parameterTypes the Class of the non-deprecated method's arguments in the order they are
-   *     declared.
-   */
-  @InterfaceAudience.Private
-  protected static boolean useLegacyMethod(final Class<? extends Coprocessor> clazz,
-      final String methodName, final Class<?>... parameterTypes) {
-    boolean useLegacy;
-    // Use reflection to see if they implement the non-deprecated version
-    try {
-      clazz.getDeclaredMethod(methodName, parameterTypes);
-      LOG.debug("Found an implementation of '" + methodName + "' that uses updated method " +
-          "signature. Skipping legacy support for invocations in '" + clazz +"'.");
-      useLegacy = false;
-    } catch (NoSuchMethodException exception) {
-      useLegacy = true;
-    } catch (SecurityException exception) {
-      LOG.warn("The Security Manager denied our attempt to detect if the coprocessor '" + clazz +
-          "' requires legacy support; assuming it does. If you get later errors about legacy " +
-          "coprocessor use, consider updating your security policy to allow access to the package" +
-          " and declared members of your implementation.");
-      LOG.debug("Details of Security Manager rejection.", exception);
-      useLegacy = true;
-    }
-    return useLegacy;
-  }
-
   /**
    * Used to limit legacy handling to once per Coprocessor class per classloader.
    */
@@ -517,21 +474,6 @@ public abstract class CoprocessorHost<C extends Coprocessor, E extends Coprocess
             }
           });
 
-  /**
-   * limits the amount of logging to once per coprocessor class.
-   * Used in concert with {@link #useLegacyMethod(Class, String, Class[])} when a runtime issue
-   * prevents properly supporting the legacy version of a coprocessor API.
-   * Since coprocessors can be in tight loops this serves to limit the amount of log spam we create.
-   */
-  @InterfaceAudience.Private
-  protected void legacyWarning(final Class<? extends Coprocessor> clazz, final String message) {
-    if(legacyWarning.add(clazz)) {
-      LOG.error("You have a legacy coprocessor loaded and there are events we can't map to the " +
-          " deprecated API. Your coprocessor will not see these events.  Please update '" + clazz +
-          "'. Details of the problem: " + message);
-    }
-  }
-
   /**
    * Implementations defined function to get an observer of type {@code O} from a coprocessor of
    * type {@code C}. Concrete implementations of CoprocessorHost define one getter for each
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java
index ee7bcd6e6a3..9eb2ec8d859 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterCoprocessorHost.java
@@ -47,7 +47,6 @@ import org.apache.hadoop.hbase.coprocessor.MasterCoprocessor;
 import org.apache.hadoop.hbase.coprocessor.MasterCoprocessorEnvironment;
 import org.apache.hadoop.hbase.coprocessor.MasterObserver;
 import org.apache.hadoop.hbase.coprocessor.MetricsCoprocessor;
-import org.apache.hadoop.hbase.coprocessor.ObserverContext;
 import org.apache.hadoop.hbase.master.locking.LockProcedure;
 import org.apache.hadoop.hbase.master.procedure.MasterProcedureEnv;
 import org.apache.hadoop.hbase.metrics.MetricRegistry;
@@ -80,7 +79,6 @@ public class MasterCoprocessorHost
    */
   private static class MasterEnvironment extends BaseEnvironment<MasterCoprocessor>
       implements MasterCoprocessorEnvironment {
-    private final boolean supportGroupCPs;
     private final MetricRegistry metricRegistry;
     private final MasterServices services;
 
@@ -88,8 +86,6 @@ public class MasterCoprocessorHost
         final Configuration conf, final MasterServices services) {
       super(impl, priority, seq, conf);
       this.services = services;
-      supportGroupCPs = !useLegacyMethod(impl.getClass(),
-          "preBalanceRSGroup", ObserverContext.class, String.class);
       this.metricRegistry =
           MetricsCoprocessor.createRegistryForMasterCoprocessor(impl.getClass().getName());
     }
@@ -1264,9 +1260,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preMoveServersAndTables(this, servers, tables, targetGroup);
-        }
+        observer.preMoveServersAndTables(this, servers, tables, targetGroup);
       }
     });
   }
@@ -1276,9 +1270,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postMoveServersAndTables(this, servers, tables, targetGroup);
-        }
+        observer.postMoveServersAndTables(this, servers, tables, targetGroup);
       }
     });
   }
@@ -1288,9 +1280,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preMoveServers(this, servers, targetGroup);
-        }
+        observer.preMoveServers(this, servers, targetGroup);
       }
     });
   }
@@ -1300,9 +1290,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postMoveServers(this, servers, targetGroup);
-        }
+        observer.postMoveServers(this, servers, targetGroup);
       }
     });
   }
@@ -1312,9 +1300,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preMoveTables(this, tables, targetGroup);
-        }
+        observer.preMoveTables(this, tables, targetGroup);
       }
     });
   }
@@ -1324,9 +1310,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postMoveTables(this, tables, targetGroup);
-        }
+        observer.postMoveTables(this, tables, targetGroup);
       }
     });
   }
@@ -1336,9 +1320,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preAddRSGroup(this, name);
-        }
+        observer.preAddRSGroup(this, name);
       }
     });
   }
@@ -1348,9 +1330,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if (((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postAddRSGroup(this, name);
-        }
+        observer.postAddRSGroup(this, name);
       }
     });
   }
@@ -1360,9 +1340,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preRemoveRSGroup(this, name);
-        }
+        observer.preRemoveRSGroup(this, name);
       }
     });
   }
@@ -1372,9 +1350,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postRemoveRSGroup(this, name);
-        }
+        observer.postRemoveRSGroup(this, name);
       }
     });
   }
@@ -1384,9 +1360,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preBalanceRSGroup(this, name);
-        }
+        observer.preBalanceRSGroup(this, name);
       }
     });
   }
@@ -1396,9 +1370,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postBalanceRSGroup(this, name, balanceRan);
-        }
+        observer.postBalanceRSGroup(this, name, balanceRan);
       }
     });
   }
@@ -1408,9 +1380,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.preRemoveServers(this, servers);
-        }
+        observer.preRemoveServers(this, servers);
       }
     });
   }
@@ -1420,9 +1390,7 @@ public class MasterCoprocessorHost
     execOperation(coprocEnvironments.isEmpty() ? null : new MasterObserverOperation() {
       @Override
       public void call(MasterObserver observer) throws IOException {
-        if(((MasterEnvironment)getEnvironment()).supportGroupCPs) {
-          observer.postRemoveServers(this, servers);
-        }
+        observer.postRemoveServers(this, servers);
       }
     });
   }