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From "Enis Soztutar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5325) Expose basic information about the master-status through jmx beans
Date Thu, 09 Feb 2012 21:58:57 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204929#comment-13204929

Enis Soztutar commented on HBASE-5325:

My 2 cents: 
bq. @Enis metrics2 seems a bit out there for us (hadoop 0.23?). We want to run on 0.23 and
1.0 and 2.0, etc., so it'd be a while before we could lean on it. metrics2 has facility that
would help? (I've not studied it).
It seems that Hadoop-1.0 includes some of the metrics2 changes  but not all, so I agree that
without going full 0.23, it is not possible to use metrics2. 

bq. I'd be interested in what you think. We need to figure being able to config a running
cluster; i.e. change Configuration values and have hbase notice. Having this go via jmx would
likely be like taking the 'killarney road to dingle' as my grandma used to say (its shorter
if you take the tralee road) so maybe jmx is read-only rather than 'management'.
With an offline discussion with Hitesh, we completely agree on the roadmap for managing the
cluster configuration in one place, but I think JMX is not suitable for this. We can keep
the current approach of read-only JMX beans, and deal with the issue of configuration management
in another ticket. I'll try to read up on how other distributed software projects approach
this problem. 

I totally agree that we might want to aggregate some of the metrics in master, and possibly
redesign the HServerLoad using metrics, but we can deal with that in yet another issue. Since
all of the metrics are collected via MasterMetrics, and exposed via MasterStatistics, I think
we will not need any API change for that, no? 

I think the current patch, as it is, is enough for defining a base for future work. It only
exposes data that is available in the webapi, and with it we would have 3 API endpoints/JMX
beans that we can query relevant info. 
HBaseInfo for common information 
HBaseMasterInfo for master level status information
MasterStatistics for metrics 
> Expose basic information about the master-status through jmx beans 
> -------------------------------------------------------------------
>                 Key: HBASE-5325
>                 URL: https://issues.apache.org/jira/browse/HBASE-5325
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Hitesh Shah
>            Assignee: Hitesh Shah
>            Priority: Minor
>             Fix For: 0.94.0
>         Attachments: HBASE-5325.1.patch, HBASE-5325.wip.patch
> Similar to the Namenode and Jobtracker, it would be good if the hbase master could expose
some information through mbeans.

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