[jira] [Created] (RATIS-152) Fix jmx registration warning in Ozone unit tests.

["Mukul Kumar Singh (JIRA)" <ji...@apache.org>]

Mukul Kumar Singh created RATIS-152:
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             Summary: Fix jmx registration warning in Ozone unit tests.
                 Key: RATIS-152
                 URL: https://issues.apache.org/jira/browse/RATIS-152
             Project: Ratis
          Issue Type: Bug
            Reporter: Mukul Kumar Singh
            Assignee: Mukul Kumar Singh


Ratis server on Ozone unit test using MiniOzoneCluster throws the following error because of failure to register jmx. This happens because jmx's are registered in a static context.

{code}
2017-11-21 15:36:40,601 [Datanode State Machine Thread - 0] ERROR impl.RaftServerImpl (RaftServerImpl.java:registerMBean(182)) - RaftServer JMX bean can't be registered
javax.management.InstanceAlreadyExistsException: Ratis:service=RaftServer,group=group-414F5A4F-4E45-5241-5449-5347524F5550,id=127.0.0.1_61259
        at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
        at org.apache.ratis.server.impl.RaftServerImpl.registerMBean(RaftServerImpl.java:180)
        at org.apache.ratis.server.impl.RaftServerImpl.start(RaftServerImpl.java:171)
        at org.apache.ratis.util.JavaUtils.getAndConsume(JavaUtils.java:67)
        at org.apache.ratis.server.impl.RaftServerProxy.start(RaftServerProxy.java:123)
        at org.apache.hadoop.ozone.container.common.transport.server.ratis.XceiverServerRatis.start(XceiverServerRatis.java:143)
        at org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer.start(OzoneContainer.java:132)
        at org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine.start(DatanodeStateMachine.java:126)
        at org.apache.hadoop.ozone.container.common.statemachine.DatanodeStateMachine.lambda$startDaemon$0(DatanodeStateMachine.java:281)
        at java.lang.Thread.run(Thread.java:745)
{code}



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