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https://issues.apache.org/jira/browse/HADOOP-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511483#comment-13511483
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Harsh J commented on HADOOP-6728:
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Hi Kay,
Majority of the Metrics2 work is already in releases out currently. The JIRA, I
think, remains unresolved for some of the incomplete minor subtasks. You can
use Metrics2 today in the release 2.0.2, for example.
> 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, 0.21.0
> Reporter: Luke Lu
> Assignee: Luke Lu
> Attachments: hadoop-6728-y20.104.patch, metrics1-flow.png,
> metrics2-builder.png, metrics2-builder-r2.png, metrics2-flow.png,
> metrics2-mutable.png, metrics2-mutable-r2.png, metrics2-record.png,
> metrics2-record-r2.png, metrics2-uml.png, metrics2-uml-r2.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.
> [The current design wiki|http://wiki.apache.org/hadoop/HADOOP-6728-MetricsV2].
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