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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-6728) Overhaul metrics framework
Date Fri, 13 May 2011 23:36:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6728?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033384#comment-13033384
] 

Luke Lu commented on HADOOP-6728:
---------------------------------

bq. metrics2.impl.TestSinkQueue is failing, see build #453, build #447, etc.

I knew the test is racy (relying on Thread.yield) but it never failed on me until the pre-commit
builds for HADOOP-7289 patches. Opened HADOOP-7292 to track the test fix.

> 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
>             Fix For: 0.23.0
>
>         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.
> [The current design wiki|http://wiki.apache.org/hadoop/HADOOP-6728-MetricsV2].

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