Cleanup Metrics and the MBeans
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Key: HADOOP-4838
URL: https://issues.apache.org/jira/browse/HADOOP-4838
Project: Hadoop Core
Issue Type: Improvement
Affects Versions: 0.20.0
Reporter: Sanjay Radia
This patch cleans up the metrics to make it easier to write metrics and the
mbeans.
Added a registry to the metrics so that the pushing of metrics can be done
automatically.
Also this registry is used to create dynamic mbeans from metrics.
Added the dynamic mbeans base and changed the existing activity beans to use
them.
Also cleanup the names of the mbeans.
Hence each time a new metrics is added to an existing set of metrics, one
needs to simply do
1) add the metrics to a holder class (such as NameNodeMetrics
2) add code to update the metrics.
The metrics will be pushed as per metrics config and it will also be published
via mbeans.
(Previous to this patch also has to add a line of code to push and add new
mbean entries).
If one is adding a new category of metrics (ie for which a holder class does
*not* exist) then
1) create metrics holder (see NameNodeMetrics as an example)
2) create mbean (see NameNodeActivityMBean as an example)
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