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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7311) Port remaining metrics v1 from trunk to branch-0.20-security
Date Fri, 20 May 2011 17:45:47 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036953#comment-13036953
] 

Luke Lu commented on HADOOP-7311:
---------------------------------

bq. I am not doing anything with metrix2 except trying not to break it.

The patch completely removes the instrumentation and tests of metrics v2 in RPC and HDFS.

bq. My motivation is to make the original metrics work, which doesn't for me in 0.20-security
branch.

Can you tell me what's missing for you in metrics v2, except for Gangalia? I can help you
porting...

bq. Are you saying metrics2 are broken in 0.22?

metrics2 is never in 0.22. It's in 0.20.2xx and trunk (targeting 0.23)

Last September, after we deployed 0.20.200 internally, I asked the community about the evolution
paths of metrics on [the mailing list|http://goo.gl/Rjb1], and the people who care to answer
[chose #2|http://goo.gl/NLLs], which was exactly what we did for 0.20.203 and trunk.

Your goal now seems to be #3, but your patch doesn't do that. I anticipated possibility of
#3 or #3a and put all metrics instrumentation behind interfaces in 0.20.2xx, so it's at least
possible without changing the instrumentation code (besides the updater or metrics source
implementation). As I pointed out in the original post in the mailing lists, there are down
sides for #3, I'd really like to know the reasons for that. I can certainly help you implementing
#3, if you can convince the community that it's really needed for 0.20.2xx releases.


> Port remaining metrics v1 from trunk to branch-0.20-security
> ------------------------------------------------------------
>
>                 Key: HADOOP-7311
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7311
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: metrics
>    Affects Versions: 0.20.203.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 0.20.204.0
>
>         Attachments: metrics-0.20-security.patch
>
>
> HADOOP-7190 added metrics packages/classes. This is a port from trunk to make them actually
work for the security branch.

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