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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6919) Metrics2: metrics framework
Date Mon, 28 Feb 2011 23:57:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000612#comment-13000612
] 

Luke Lu commented on HADOOP-6919:
---------------------------------

bq. When revise for the current trunk (0.23), could you make sure that MetricsContext is backward
compatible? It would be good to give them sometime in 0.23 time frame to make the switch.
This ensures that HBase can release independently, without tie to Hadoop 0.23 release schedule.

The existing 0.22+ patches don't remove but deprecate metrics v1 so existing app depending
on v1 still works (in a limited way, as they won't see metrics defined in new metrics sources.)

This is different from the current 0.20.100 branch which removed metrics v1 completely to
ensure everything was ported, as the original branch was not targeting external/backward compatibility,
which is causing some problems (with trivial workarounds) for dependent projects like Hive
that depend on metrics v1.

> Metrics2: metrics framework
> ---------------------------
>
>                 Key: HADOOP-6919
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6919
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: metrics
>    Affects Versions: 0.20.2
>            Reporter: Luke Lu
>            Assignee: Luke Lu
>         Attachments: hadoop-6919-trunk-v1.patch
>
>
> The jira tracks the new metrics framework only changes, i.e., it doesn't track the instrumentation
changes (and compatibility issues) to existing code.

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