HBaseAdmin.stopRegionServer do not stop the region server

Please running this example:

public class Test {
public static void main(String[] args) throws Exception

{ HBaseAdmin admin = new HBaseAdmin(HBaseConfiguration.create()); admin.stopRegionServer("your.rs.hostname:60020"); }

}

then, you can see:

Exception in thread "main" java.lang.RuntimeException: The interface org.apache.hadoop.hbase.Stoppable
at org.apache.hadoop.hbase.ipc.Invocation.<init>(Invocation.java:61)
at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:151)
at $Proxy2.stop(Unknown Source)
at org.apache.hadoop.hbase.client.HBaseAdmin.stopRegionServer(HBaseAdmin.java:1492)
at Test.main(Test.java:7)
Caused by: java.lang.NoSuchFieldException: VERSION
at java.lang.Class.getField(Class.java:1520)
at org.apache.hadoop.hbase.ipc.Invocation.<init>(Invocation.java:57)
... 4 more

When invoking the "HBaseAdmin.stopRegionServer" method，
we obtain a "proxy" for org.apache.hadoop.hbase.ipc.HRegionInterface，
(HRegionInterface extends org.apache.hadoop.hbase.Stoppable)
but the "stop" method declared in Stoppable.

In the constructor of "org.apache.hadoop.hbase.ipc.Invocation"，
the "method" argument is "public abstract void org.apache.hadoop.hbase.Stoppable.stop(java.lang.String)"，
so, "method.getDeclaringClass()" is "org.apache.hadoop.hbase.Stoppable"，
but, the "Stoppable" interface no "VERSION" field.

[fix suggestion]:

Override the "stop" method in org.apache.hadoop.hbase.ipc.HRegionInterface as follows:
==================================
@Override
public void stop(String why);

of courese, another attempt is ok.
(e.g. declare "VERSION" field in Stoppable interface，
then modify some code fragment of Invocation and org.apache.hadoop.hbase.ipc.WritableRpcEngine.Server)