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From "Eric Yang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6728) Overhaul metrics framework
Date Sat, 18 Sep 2010 02:19:38 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910891#action_12910891
] 

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

The design is treating jmx and ganglia as first class citizen.  Why not web service REST api?
 For code structure perspective, this is cleaner but it breaks existing API without real value
to the customer who already use jmx or MetricsContext api.  Is there possibility to have REST
interface without having to go through another bridge?  I was thinking if the interface could
be generalized, the new metrics framework can enable ability to create metrics REST api on
name node, jobtracker, datanode, and task tracker in a consistent manner.

> 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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