Why is ambari showing incorrect number of data nodes available?

[#1]

Ambari shows 6 of 5 datanodes live in dashboard. The correct count is 6 nodes, which is reflected in the NameNode UI. I have tried restarting Ambari-server and all the agents and issue will not resolve.

What other options should I explore to update the correct node count?

[#2]

What version of Ambari are you running and have you recently removed a host with a DataNode component on it?

[#3]

Hi Paul, we are running Ambari Version2.0.1 on this cluster. The datanode service is still running on the cluster. Ambari isnt recognizing the service on the dashboard.

[#4]

I think it just takes some extra time when an architectural change is made to the cluster but eventually Ambari displays it correctly. I noticed something similar after enabling HA where Ambari took 5+ minutes to show the correct number of datanodes. If the problem persists, it may be another issue.

[#5]

This issue has been on-going for several days without any resolution.

[#6]

Hi Mike - I am assuming you have already tried restarting the Ambari Agent? I have seen stale agent process causing similar issue as well.

[#7 · Accepted solution]

@michael.perez@hortonworks.com - my suggestion would be to get on Ambari 2.0.2 as I noticed this issue in 2.0.1, specifically in reporting 1 more host than really existed in the list view (AMBARI-10297). Check out the release notes as well for more information.

[#8]

when I delete one host, this occured

how to solve it ? ambari 2.4.1.0