Overhaul metric framework
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Key: HADOOP-6728
URL: https://issues.apache.org/jira/browse/HADOOP-6728
Project: Hadoop Common
Issue Type: Improvement
Reporter: Luke Lu
Fix For: 0.20.3
Per discussions with Arun, Chris, Hong and Rajiv, et al, we concluded that the
current metrics framework needs an overhaul to:
* Allow multiple plugins for different monitoring systems simultaneously (see
also: HADOOP-6508).
* Refresh metrics plugin config without server restart.
** Including filtering of metrics per plugin.
* Support metrics schema for plugins.
The jira will be resolved when core hadoop components (hdfs, mapreduce) are
updated to use the new framework . Updates to external components that use the
existing metrics framework will be tracked by different issues.
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