[jira] [Created] (HBASE-12102) Duplicate keys in HBase.RegionServer metrics JSON

["Andrew Purtell (JIRA)" <ji...@apache.org>]

Andrew Purtell created HBASE-12102:
--------------------------------------

             Summary: Duplicate keys in HBase.RegionServer metrics JSON
                 Key: HBASE-12102
                 URL: https://issues.apache.org/jira/browse/HBASE-12102
             Project: HBase
          Issue Type: Bug
            Reporter: Andrew Purtell
            Priority: Minor


The JSON returned by /jmx on the RegionServer contains duplicate 'tag.Context' keys for various HBase.RegionServer metrics. 

Regions:
{noformat}
{
    "name" : "Hadoop:service=HBase,name=RegionServer,sub=Regions",
    "modelerType" : "RegionServer,sub=Regions",
    "tag.Context" : "regionserver",
    "tag.Context" : "regionserver",
    "tag.Hostname" : "some.host.name",
    ...
}
{noformat}

Server:
{noformat}
"name" : "Hadoop:service=HBase,name=RegionServer,sub=Server",
    "modelerType" : "RegionServer,sub=Server",
    "tag.Context" : "regionserver",
    "tag.zookeeperQuorum" : "some.zookeeper.quorum.peers",
    "tag.serverName" : "some.server.name",
    "tag.clusterId" : "88c186ea-2308-4713-8b5f-5a3e829cbb10",
    "tag.Context" : "regionserver",
    ...
}
{noformat}

IPC:
{noformat}
{
    "name" : "Hadoop:service=HBase,name=IPC,sub=IPC",
    "modelerType" : "IPC,sub=IPC",
    "tag.Context" : "ipc",
    "tag.Context" : "ipc",
    "tag.Hostname" : "some.host.name",
    ...
}
{noformat}

This can cause issues with some JSON parsers. We should avoid emitting duplicate keys if it is under our control.



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