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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-4050) Update HBase metrics framework to metrics2 framework
Date Thu, 12 Jul 2012 01:55:35 GMT

     [ https://issues.apache.org/jira/browse/HBASE-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliott Clark updated HBASE-4050:
---------------------------------

    Attachment: HBASE-4050-0.patch

Here's a patch that add's hadoop compatibility shims.  I needed something to prototype and
test with so I used my implementation of HBASE-6323 as an example.

hbase-hadoop-compat contains the factory and the interface.  The factory uses ResourceFinder
from the geronimo project.  It's much more flexible than ServiceLoader (allows different locations
easily and most importantly it allows constructor arguments).  I didn't want to add the whole
geronimo project as a dep so the code is copied in.  I tried to give as much credit as I could.
 I can go back to using ServiceLoader if people object to having 

hbase-hadoop1-compat and hbase-hadoop2-compat add the actual implementation of the class who's
interface is defined in hbase-hadoop-compat.  I don't have a hbase-hadoop23-compat

Right now depending upon which profile is building the hbase-server module gets one of the
above as a dependency.

In addition when building assembly files only contain the hbase-hadoop{1,2}-compat directory
needed.  It's possible to keep the old assembly file the way it was and change the shell scripts
to only load the one.  But I didn't get to that.

I tested it in place and locally after building tar.gz's on both 
* hadoop 1.0.3
* hadoop 2.0.0-alpha

In place scripts still work though I'm not really sure of why or how.  I need to investigate
that later.
                
> 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: Alex Baranau
>            Priority: Critical
>             Fix For: 0.96.0
>
>         Attachments: 4050-metrics-v2.patch, 4050-metrics-v3.patch, HBASE-4050-0.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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