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From "Hadoop QA (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8177) MBeans shouldn't try to register when it fails to create MBeanName
Date Fri, 16 Mar 2012 15:09:39 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231279#comment-13231279
] 

Hadoop QA commented on HADOOP-8177:
-----------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12518647/HADOOP-8177.patch
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    +1 eclipse:eclipse.  The patch built with eclipse:eclipse.

    +1 findbugs.  The patch does not introduce any new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit
warnings.

    -1 core tests.  The patch failed these unit tests:
                  org.apache.hadoop.fs.viewfs.TestViewFsTrash

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-HADOOP-Build/720//testReport/
Console output: https://builds.apache.org/job/PreCommit-HADOOP-Build/720//console

This message is automatically generated.
                
> MBeans shouldn't try to register when it fails to create MBeanName
> ------------------------------------------------------------------
>
>                 Key: HADOOP-8177
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8177
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.24.0
>            Reporter: Devaraj K
>            Assignee: Devaraj K
>         Attachments: HADOOP-8177.patch
>
>
> {code:title=MBeans.java|borderStyle=solid}
>   static public ObjectName register(String serviceName, String nameName,
>                                     Object theMbean) {
>     final MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
>     ObjectName name = getMBeanName(serviceName, nameName);
>     try {
>       mbs.registerMBean(theMbean, name);
>       LOG.debug("Registered "+ name);
>       return name;
>     } catch (InstanceAlreadyExistsException iaee) {
>       if (LOG.isTraceEnabled()) {
>         LOG.trace("Failed to register MBean \""+ name + "\"", iaee);
>       } else {
>         LOG.warn("Failed to register MBean \""+ name
>             + "\": Instance already exists.");
>       }
>     } catch (Exception e) {
>       LOG.warn("Failed to register MBean \""+ name + "\"", e);
>     }
>     return null;
>   }
>   static private ObjectName getMBeanName(String serviceName, String nameName) {
>     ObjectName name = null;
>     String nameStr = "Hadoop:service="+ serviceName +",name="+ nameName;
>     try {
>       name = DefaultMetricsSystem.newMBeanName(nameStr);
>     } catch (Exception e) {
>       LOG.warn("Error creating MBean object name: "+ nameStr, e);
>     }
>     return name;
>   }
> {code}
> In getMBeanName() if DefaultMetricsSystem.newMBeanName(nameStr); fails with some reason
like mbean already exists, getMBeanName() logs the exception and returns null and  mbs.registerMBean(theMbean,
name) in register() tries to register with null and throws exception with the message 'Failed
to register MBean "null"'.

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