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From "Dmytro Molkov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6470) JMX Context for Metrics
Date Thu, 24 Dec 2009 01:24:29 GMT
JMX Context for Metrics

                 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
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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