Jonathan Hsieh created HBASE-10436:
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Summary: 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: 0.96.0, 0.98.0, 0.99.0
Reporter: Jonathan Hsieh
Assignee: Jonathan Hsieh
Priority: Critical
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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