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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10436) hbase 0.96+ jmx does not have regionserver info any more.
Date Wed, 29 Jan 2014 22:56:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10436?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13885949#comment-13885949
] 

Lars Hofhansl commented on HBASE-10436:
---------------------------------------

{{$HBASE_HOME/conf/regionservers}} does not contain the actual set of regionserver (alive
or dead), just the configured ones.

bq. I did too but mine was pretty invasive. Lets hope that yours gets more love
Benoit pulled it already. Mine was very simple (https://github.com/OpenTSDB/tcollector/pull/131)
and it works with 0.94 and 0.96+. Needs to test replication still.

As for this issue. Could you suggest a simple approach/patch that exposes the set of current
(alive and dead) RSs through metrics2? I do not think anybody is opposed to doing that if
it can be easily done.


> hbase 0.96+ jmx does 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-10436.v2.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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