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https://issues.apache.org/jira/browse/HDFS-14400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16807967#comment-16807967
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Íñigo Goiri commented on HDFS-14400:
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[~kpalanisamy], my whole point is that I think that the counter is correct.
This metrics represents the number of times we got an expired heartbeat.
Here you are adding a new metric which is the current number of DNs that have a
expired HB.
We should keep the old one.
> Namenode ExpiredHeartbeats metric
> ---------------------------------
>
> Key: HDFS-14400
> URL: https://issues.apache.org/jira/browse/HDFS-14400
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 3.1.2
> Reporter: Karthik Palanisamy
> Assignee: Karthik Palanisamy
> Priority: Minor
> Attachments: HDFS-14400-001.patch, HDFS-14400-002.patch,
> HDFS-14400-003.patch
>
>
> Noticed incorrect value in ExpiredHeartbeats metrics under namenode JMX.
> We will increment ExpiredHeartbeats count when Datanode is dead but somehow
> we missed to decrement when datanode is alive back.
> {code}
> { "name" : "Hadoop:service=NameNode,name=FSNamesystem", "modelerType" :
> "FSNamesystem", "tag.Context" : "dfs", "tag.TotalSyncTimes" : "7 ",
> "tag.HAState" : "active", ... "ExpiredHeartbeats" : 2, ... }
> {code}
>
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