HBaseAdmin.stopRegionServer do not stop the region server
---------------------------------------------------------
Key: HBASE-5007
URL: https://issues.apache.org/jira/browse/HBASE-5007
Project: HBase
Issue Type: Bug
Components: ipc
Affects Versions: 0.92.0
Environment: all
Reporter: honghua zhu
Fix For: 0.92.0
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)
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