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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10436) hbase 0.96+ jmx metrics do not have regionserver info any more.
Date Wed, 29 Jan 2014 09:32:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885163#comment-13885163

Elliott Clark commented on HBASE-10436:

First this patch only addresses jmx and not the actual metrics system. (See how the other
HMaster metrics are exposed; Interfaces in hbase-hadoop-compat and implementations in hbase-hadoop1|2-compat)

Secondly, This will synchronize on the online servers list everytime that JMX is polled. 
That seems pretty onerous for exposing the list of region servers.  That api already exists;
We should have one way of getting that list, not multiple.

Finally I disagree that the metrics api should be treated like the user api.  It's not the
same at all.  If the HTable interface changes then compatibility is broken and users aren't
able to get or put data.  If the metrics interface changes then some charts aren't filled
in.  Those seems very different to me.  Also there is no concept of deprecation with metrics.
 That just isn't ever surfaced to 

> hbase 0.96+ jmx metrics do not have regionserver info any more.
> ---------------------------------------------------------------
>                 Key: HBASE-10436
>                 URL: https://issues.apache.org/jira/browse/HBASE-10436
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.0, 0.96.0, 0.99.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>            Priority: Critical
>         Attachments: hbase-10436.patch
> HBase 0.96's refactored jmx beans do not contain the master's list of dead region servers
and live regionservers with load info.  HBase 0.94 did (though in a single monolithic blob).
> This JMX interface should be considered as much of an API as the the normal wire or java
api.  Dropping values from this was done without deprecation and the removal of this information
is a functional regression.
> We should provide the information in the 0.96+ JMX.  HBase 0.94 had a  monolithic JMX
blob ("hadoop:service=Master,name=Master")  that contained a lot of information, including
the regionserver list and the cached regionserver load for each region  found on the master
webpage.  0.96+ refactored jmx this into several jmx beans which could be selectively retrieved.
 These include:
> * hadoop:service=HBase,name=Master,sub=AssignmentManager
> * hadoop:service=HBase,name=Master,sub=Balancer
> * hadoop:service=HBase,name=Master,sub=Server
> * hadoop:service=HBase,name=Master,sub=FileSystem
> Specifically the (Hadoop:service=HBase,name=Master,sub=Server) listing that used to contain
regionservers and deadregionservers in jmx were replaced in   with numRegionServers and numDeadRegionservers
which only contain counts.  
> I propose just adding another mbean called "RegionServers" under the bean: "hadoop:service=HBase,name=Master,sub=RegionServers"

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