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Why is ambari showing incorrect number of data nodes available?
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Apache Ambari
Created on 10-05-2015 05:11 PM - edited 08-19-2019 05:59 AM
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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?
Created 10-06-2015 01:24 PM
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@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.
Created 10-05-2015 06:14 PM
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What version of Ambari are you running and have you recently removed a host with a DataNode component on it?
Created 10-06-2015 02:44 AM
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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.
Created 10-05-2015 06:38 PM
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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.
Created 10-06-2015 02:44 AM
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This issue has been on-going for several days without any resolution.
Created 10-06-2015 02:47 AM
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Hi Mike - I am assuming you have already tried restarting the Ambari Agent? I have seen stale agent process causing similar issue as well.
Created 10-06-2015 01:24 PM
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@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.
Created on 07-17-2017 09:16 AM - edited 08-19-2019 05:59 AM
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when I delete one host, this occured
how to solve it ? ambari 2.4.1.0