[HDFS-14400] Namenode ExpiredHeartbeats metric

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Not A Bug
• Affects Version/s: 3.1.2
• Component/s: hdfs
• Assignee: Karthik Palanisamy
• Reporter: Karthik Palanisamy
• Created: 30/Mar/19 01:23
• Updated: 02/Apr/19 19:39
• Resolved: 02/Apr/19 19:39

Description

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.

{ "name" : "Hadoop:service=NameNode,name=FSNamesystem", "modelerType" : "FSNamesystem", "tag.Context" : "dfs", "tag.TotalSyncTimes" : "7 ", "tag.HAState" : "active", ... "ExpiredHeartbeats" : 2, ... }