JMX Context for Metrics
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Key: HADOOP-6470
URL: https://issues.apache.org/jira/browse/HADOOP-6470
Project: Hadoop Common
Issue Type: New Feature
Reporter: Dmytro Molkov
The way metrics are currently exposed to the JMX in the NameNode is not
helpful, since only the current counters in the record can be fetched and
without any context those number mean little.
For example the number of files created equal to 150 only means that in the
last period there were 150 files created but when the new period will end is
unknown so fetching 150 again will either mean another 150 files or we are
fetching the same time period.
One of the solutions for this problem will be to have a JMX context that will
accumulate the data (being child class of AbstractMetricsContext) and expose
different records to the JMX through custom MBeans. This way the information
fetched from the JMX will represent the state of things in a more meaningful
way.
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