[HADOOP-15339] Support additional key/value propereties in JMX bean registration

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.2.0
• Component/s: common
• Target Version/s: 3.2.0, 3.1.2
• Hadoop Flags: Reviewed
• Assignee: Marton Elek
• Reporter: Marton Elek
• Created: 23/Mar/18 09:01
• Updated: 02/Nov/18 10:27
• Resolved: 02/Nov/18 10:27

Description

org.apache.hadoop.metrics2.util.MBeans.register is a utility function to register objects to the JMX registry with a given name prefix and name.

JMX supports any additional key value pairs which could be part the the address of the jmx bean. For example: java.lang:type=MemoryManager,name=CodeCacheManager

Using this method we can query a group of mbeans, for example we can add the same tag to similar mbeans from namenode and datanode.

This patch adds a small modification to support custom key value pairs and also introduce a new unit test for MBeans utility which was missing until now.