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  1. Hadoop HDFS
  2. HDFS-13721

NPE in DataNode due to uninitialized DiskBalancer

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    Details

    • Type: Bug
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.2.0, 3.1.2
    • Component/s: datanode, diskbalancer
    • Labels:
      None
    • Target Version/s:
    • Hadoop Flags:
      Reviewed

      Description

      2018-06-28 05:11:47,650 ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute DiskBalancerStatus of Hadoop:service=DataNode,name=DataNodeInfo threw an exception
      javax.management.RuntimeMBeanException: java.lang.NullPointerException
       ***** TRACEBACK 4 *****
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:839)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrowMaybeMBeanException(DefaultMBeanServerInterceptor.java:852)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:651)
       at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)
       at org.apache.hadoop.jmx.JMXJsonServlet.writeAttribute(JMXJsonServlet.java:338)
       at org.apache.hadoop.jmx.JMXJsonServlet.listBeans(JMXJsonServlet.java:316)
       at org.apache.hadoop.jmx.JMXJsonServlet.doGet(JMXJsonServlet.java:210)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
       at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
       at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848)
       at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772)
       at org.apache.hadoop.http.lib.StaticUserWebFilter$StaticUserFilter.doFilter(StaticUserWebFilter.java:110)
       at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
       at org.apache.hadoop.http.HttpServer2$QuotingInputFilter.doFilter(HttpServer2.java:1537)
       at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
       at org.apache.hadoop.http.NoCacheFilter.doFilter(NoCacheFilter.java:45)
       at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759)
       at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582)
       at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
       at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
       at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)
       at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1180)
       at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512)
       at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)
       at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112)
       at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
       at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)
       at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)
       at org.eclipse.jetty.server.Server.handle(Server.java:534)
       at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
       at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
       at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:283)
       at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:108)
       at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)
       at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)
       at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)
       at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)
       at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)
       at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)
       at java.lang.Thread.run(Thread.java:748)
      Caused by: java.lang.NullPointerException
       at org.apache.hadoop.hdfs.server.datanode.DataNode.getDiskBalancerStatus(DataNode.java:3146)
       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
       at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:498)
       at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
       at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
       at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
       at java.lang.reflect.Method.invoke(Method.java:498)
       at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
       at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:193)
       at com.sun.jmx.mbeanserver.ConvertingMethod.invokeWithOpenReturn(ConvertingMethod.java:175)
       at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:117)
       at com.sun.jmx.mbeanserver.MXBeanIntrospector.invokeM2(MXBeanIntrospector.java:54)
       at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)
       at com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:83)
       at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:206)
       at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647)
      2018-06-28 05:12:08,400 ERROR org.apache.hadoop.jmx.JMXJsonServlet: getting attribute DiskBalancerStatus of Hadoop:service=DataNode,name=DataNodeInfo threw an exception
      javax.management.RuntimeMBeanException: java.lang.NullPointerException
      

      We have seen the above exception at datanode startup time. Should improve the NPE. Changing it to an IOE will also allow jmx to return '' correctly for getDiskBalancerStatus

      .

       

        Attachments

        1. HDFS-13721.01.patch
          3 kB
          Xiao Chen
        2. HDFS-13721.02.patch
          4 kB
          Xiao Chen

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              • Assignee:
                xiaochen Xiao Chen
                Reporter:
                xiaochen Xiao Chen
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                Dates

                • Created:
                  Updated:
                  Resolved: