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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5325) Expose basic information about the master-status through jmx beans
Date Fri, 03 Feb 2012 05:43:53 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13199534#comment-13199534
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stack commented on HBASE-5325:
------------------------------

bq. Similar to the Namenode and Jobtracker, it would be good if the hbase master could expose
some information through mbeans.

Can we go further (smile)?

Would be cool if when a regionserver registered, master started listening (or asking) regionservers
for their metrics via jmx.  Master could use the collected info when it displays its UI (Perhaps
it would make sense to do a cluster federated mbean that has the sum of all regionserver jmx
metrics and use this displaying master ui (?) plus a master mbean with the master's vitals).
 If we got this working, using jmx to query vitals, perhaps we could undo the rpc that the
regionserver does to the master every second or so to tell it about its current load since
HServerLoad is essentially duplicating metrics (Static or near-static properties that HServerLoad
reports such as loaded coprocessors could be hoisted up as data in the regionservers ephemeral
znode as protobufs/json data -- we could add to whats in HServerLoad reporting system vitals
too like RAM, CPUs, Disks.  Master could do the same hoisting vitals up into its zk znode...
and/or emit in an mbean).

                
> 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: Bug
>            Reporter: Hitesh Shah
>            Priority: Minor
>         Attachments: 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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