Dong Lin created KAFKA-2278:
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             Summary: JmxTool should support querying all objects when 
object-name is omitted
                 Key: KAFKA-2278
                 URL: https://issues.apache.org/jira/browse/KAFKA-2278
             Project: Kafka
          Issue Type: Improvement
            Reporter: Dong Lin
            Assignee: Dong Lin


One usecase of JmxTool is to allow user to query all existing objects and 
attributes, such that the developer can quickly lookup the right object name 
and attribute name in the output. Indeed, existing API of JmxTool allows user 
to do this when object-name is not specified in argument.

However, current implementation of JmxTool doesn't support this operation due 
to the way it is implemented. This is partly due to the fact that some JMX 
object, such as java.lang:type=MemoryPool, doesn't have value for all its 
attributes.

The patch submitted here will fix the problem.




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