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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6728) Overhaul metrics framework
Date Fri, 17 Sep 2010 23:39:40 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910849#action_12910849
] 

Eric Yang commented on HADOOP-6728:
-----------------------------------

With this change, would it be possible to send job related metrics through this code path?
 I.e. Stuff that implements org.apache.hadoop.mapred.Reporter interface.  How about provide
an example of REST style API for query when plugin is registered through MetricsSource code
path?  

> 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: hadoop-6728-y20.104.patch, metrics1-flow.png, metrics2-builder-r2.png,
metrics2-builder.png, metrics2-flow.png, metrics2-mutable-r2.png, metrics2-mutable.png, metrics2-record-r2.png,
metrics2-record.png, metrics2-uml-r2.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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