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https://issues.apache.org/jira/browse/HADOOP-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12872312#action_12872312
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Luke Lu commented on HADOOP-6728:
---------------------------------
First cut of the design doc:
http://wiki.apache.org/hadoop/HADOOP-6728-MetricsV2?action=recall&rev=1
Note, it's an experiment to use apache wiki (vs. pdf/doc attachments) for
design docs. Feel free to correct typos and grammatical errors. Please refrain
from adding new requirements without discussing them here :)
> Overhaul metrics framework
> --------------------------
>
> Key: HADOOP-6728
> URL: https://issues.apache.org/jira/browse/HADOOP-6728
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 0.20.2
> Reporter: Luke Lu
> Assignee: Luke Lu
> Fix For: 0.22.0
>
> Attachments: metrics1-flow.png, metrics2-builder.png,
> metrics2-flow.png, metrics2-mutable.png, metrics2-record.png, metrics2-uml.png
>
>
> 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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