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https://issues.apache.org/jira/browse/HBASE-12102?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14324484#comment-14324484
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Andrew Purtell commented on HBASE-12102:
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+1
Will commit shortly
> Duplicate keys in HBase.RegionServer metrics JSON
> -------------------------------------------------
>
> Key: HBASE-12102
> URL: https://issues.apache.org/jira/browse/HBASE-12102
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.0.0, 2.0.0, 0.98.10
> Reporter: Andrew Purtell
> Assignee: Ravi Kishore Valeti
> Priority: Minor
> Fix For: 2.0.0, 1.0.1, 1.1.0, 0.98.11
>
> Attachments: HBASE-12102-0.98.patch, HBASE-12102.patch
>
>
> 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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