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Date: Tue, 17 Jul 2012 23:54:34 +0000 (UTC)
From: "Elliott Clark (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-4050) Update HBase metrics framework to
 metrics2 framework
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    [ https://issues.apache.org/jira/browse/HBASE-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416736#comment-13416736 ] 

Elliott Clark commented on HBASE-4050:
--------------------------------------

{code}
  Collection<MutableMetric> metrics()
{code}

Removing from a linked list (the collection backing the map in question) is icky.  I filed a jira a while ago.  HADOOP-8313
yes this is not great.  As soon as possible I would love to remove the metrics factory and all related maps.  That would greatly simplify stuff.  I think we should get things working now and refactor away as soon as possible.
                
> Update HBase metrics framework to metrics2 framework
> ----------------------------------------------------
>
>                 Key: HBASE-4050
>                 URL: https://issues.apache.org/jira/browse/HBASE-4050
>             Project: HBase
>          Issue Type: New Feature
>          Components: metrics
>    Affects Versions: 0.90.4
>         Environment: Java 6
>            Reporter: Eric Yang
>            Assignee: Elliott Clark
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: 4050-metrics-v2.patch, 4050-metrics-v3.patch, HBASE-4050-0.patch, HBASE-4050-1.patch, HBASE-4050-2.patch, HBASE-4050-3.patch, HBASE-4050-5.patch, HBASE-4050-6.patch, HBASE-4050-7.patch, HBASE-4050-8.patch, HBASE-4050.patch
>
>
> Metrics Framework has been marked deprecated in Hadoop 0.20.203+ and 0.22+, and it might get removed in future Hadoop release.  Hence, HBase needs to revise the dependency of MetricsContext to use Metrics2 framework.

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